See e-log entry: 884:

Thursday, February 04, 2021, 18:45: Roughing

Thursday, February 04, 2021, 19:13: Turbos on.

Thursday, February 04, 2021, 19:22: IG1 on.

AS

Friday, February 05, 2021, 06:20: Waterline FS#5 open. Vacuum ok @ 1.71e-06T.

Friday, February 05, 2021, 06:23:

Friday, February 05, 2021, 06:26: Tried to put 100 - 1000 V on the BIAS. Goes to 0.0 kV - BIAS:RDVOL / 0.029 mA - BIAS:RDCUR, straight to current limit. BIAS is shorted.

Friday, February 05, 2021, 06:32: Power / Sources / Optics off. Ion gauge & Turbo pumps off.

Friday, February 05, 2021, 07:28: Venting.

Friday, February 05, 2021, 08:37: Roughing. Target was re-salted. GE line was close/light touch to (B) line. Adjusted. Waterlines open on FS#5.

Friday, February 05, 2021, 09:06; Turbo pump TP1B on.

Friday, February 05, 2021, 09:14: Turbo pump TP1A on

Friday, February 05, 2021, 09:19: TP1A tripped. Wait on backing pressure.

Friday, February 05, 2021, 09:35: Vacuum Bypass on BV1A to turn on TP1A.

Friday, February 05, 2021, 09:39: TP1A at speed. Ion gauge on. Bypass removed.

Friday, February 05, 2021, 09:55: IG1 off. Bypass used on IG1. EE on, BIAS on.

Friday, February 05, 2021, 09:56: 500 - 1000 V - BIAS:RDVOL / 0.000 mA - BIAS:RDCUR. Ok.

Friday, February 05, 2021, 09:58: BIAS & EE off. Bypass removed. IG1 back on. Initial check ok. Vacuum to go below 1.0e-05T.

Friday, February 05, 2021, 11:37: Power / Sources / Optics on & set. Vacuum @ 6.46e-06T.

Friday, February 05, 2021, 11:42: BIAS / EE / EZL @ 10 / -1.0 / 7.5 kV

Friday, February 05, 2021, 11:50: BIAS / EE / EZL @ 20 / -1.5 / 13 kV. TGHT / TBHT @ 10 / 10 A.

Friday, February 05, 2021, 11:58: BIAS / EE / EZL @ 25 / -1.5 / 13 kV. TGHT / TBHT @ 10 / 10 A. Anode checked up to 100 V & down again. Ok.

Friday, February 05, 2021, 12:06: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. TGHT / TBHT @ 10 / 10 A.

Friday, February 05, 2021, 12:14: BIAS / EE / EZL @ 35 / -1.5 / 13.5 kV. TGHT / TBHT @ 10 / 10 A.

Friday, February 05, 2021, 12:24: It charged up and began sparking continuously around 12:23.

Friday, February 05, 2021, 12:33: BIAS / EE / EZL @ 15 / -1.0 / 10 kV. TGHT / TBHT @ 10 / 10 A. The sparks were both clearly audible & visible on the spark gap up top (Image to be included in word doc)

FM

Friday, February 05, 2021, 14:16:   BIAS / EE / EZL @ 30/ -1.5 / 13 kV.  Anode @ 50 V.

Friday, February 05, 2021, 14:18: Auto ramp-up TGHT/TBHT to 580/230 A @ 4A/min

Friday, February 05, 2021, 15:08: Anode shorted, I think the  tube heater is touching the plasma electrode. TGHT/TBHT @ 209/209 A. TBHT voltage= 2.2. At the same time the bias current jump from 0.008 to 0.01.

Friday, February 05, 2021, 15:12: Reducing the TBHT to 190 A 2 V. Bias current linearly reducing with tbht current. The cathode is not current limited anymore. Wondering if the TBHT power supply is causing an electrical backflow or if the ion source is touching the plasma electrode.

Friday, February 05, 2021, 15:16: Auto ramp-up TGHT/TBHT to 580/230 A @  2 A/min

Friday, February 05, 2021, 15:21: The same effect as before at TBHT=223 A. When reducing to 190 A, anode goes up. 

Friday, February 05, 2021, 15:30:  Auto ramp-up TGHT to 580 A @ 4A/min and TBHT to 230 @ 1 A/min. 

Friday, February 05, 2021, 15:55: Sparks, not audible nor visible. I think I saw one on the top part of the water blocks. Lowering bias to 10 kV.

Friday, February 05, 2021, 15:56 : Auto-ramp range to 4A/min on both TGHT and TBHT

Friday, February 05, 2021, 19:23:  almost 2.5 hours without sparks. RPM tests performed. Voltages to zero. Will rise later or tomorrow remotely.

Taped down to 180/500 A on TBHT/TGHT. All voltages to  BIAS / EE / EZL @ 0.000 kV.

Saturday, February 06, 2021, 11:14:   Auto ramp-up TGHT/TBHT to 580/230 A @ 4A/min

Saturday, February 06, 2021, 12:16:    BIAS / EE / EZL @ 30/ 1.5 / 0kV.  

Saturday, February 06, 2021, 12:30: The previous tune is not working anymore. I have to re-tune . EZL now helps to have a better tune, no need for extreme steering

Well well well, after several scans I observed the following:

• Bias readback changes by 14  V. This doesn't necessarily means this is the absolute value, it could be better or worse.
• Magnet oscillates around 1 gauss, enough to move the beam to the sides.
• Different settings on the rpm scans does not yield to different results in the data
• Intensity variations causes one of the rpms scans to be lower or higher.
• Total source scans are always mirrored as long as nothing else varies.
• Separated ion scans varied wildly. No two consecutive scans are the same. Likely a combination of Bias voltage and magnet current ripples.
• Following Baartman's proceedure on a cherry-picked data set, I estimated an energy spread of 11.75 eV. To be discussed with him

Saturday, February 06, 2021, 20:00 Biases to 0.000 kV

Saturday, February 06, 2021, 20:00 : Auto-cooling TGHT/TBHT  to  400/150 A @ 3 A/min

 Saturday, February 06, 2021, 21:02: On the way down, TBHT 150  A and when TGHT cross 480 A the anode came back to life. Wonder if this could help diagnose deflection on the surface ion source (might be helpful for the P2N)

Sunday, February 07, 2021, 08:26:  Auto ramp-up TGHT/TBHT to 560/210 A @ 2A/min

Sunday, February 07, 2021, 09:18: Anode got current limited again when TGHT/TBHT @ 446/200 A 

Sunday, February 07, 2021, 11:26:  Auto ramp-up TGHT/TBHT to 560/210 A @ 2A/min 

 Sunday, February 07, 2021, 11:31: Once again, the latest tune did not work. I suspect the ion source deformation varied from thermal cycle to thermal cycle. With a crooked beam, the EZL will send the beam off-center and the quad will not compensate that. The double peak observed in the beam size scan indicates that the focusing is not correct.

Sunday, February 07, 2021, 18:41: With Baartman RPM scans, the x axis in in cm, as verified with an emittance scan.

New parameters on the emittance rig for this tune. Offset from 40 to -50. This shifts the phase space in the y axis such that is visible on the plot. 

Even in a different mass, the position scans on the dispersion plan are not reproducible.

Sunday, February 07, 2021, 18:52: Auto-cooling TGHT/TBHT to 400/150 A  @ 6A/min / 3 A/min, respectively.

 Sunday, February 07, 2021, 18:53: Biases to 0.000 kV

I think the fast cool-down rate prevented the TBHTto be able to sustained voltage.

Sunday, February 07, 2021, 19:35: Auto-cooling TGHT/TBHT to 0 A @ 3A/min 

TBHT able to sustain voltage once TBHT=191 A and TGHT=372 A

Monday, February 08, 2021, 07:14: IV4 close

Monday, February 08, 2021, 07:15: IG1 off. Turbos off. 

 Friday, February 12, 2021, 12:13: Since the collimator is not used, Carla and I installed a BNC short outside the cage. See picture.

Friday, February 12, 2021, 16:37: FEBIAD installed with mechanical calibrated leak

Friday, February 12, 2021, 16:38: Roughing.

Gas lines opened all the way to the sour. SV4 and SV5.

Friday, February 12, 2021, 18:47: Turbos on.

Friday, February 12, 2021, 18:55: IG1 on.

Friday, February 12, 2021, 23:22: IG1 @ 1.5E-4 T.  I think the line inside the vacuum chamber is leaking

Friday, February 12, 2021, 23:23: SV5 closed.

Friday, February 12, 2021, 23:24: Vacuum dropping slightly.

Friday, February 12, 2021, 23:24: SV5 opened. IG1 responds to the opening of SV5. The lines from the feedthrough to the calibrated leak need to be re-done.

Tuesday, February 16, 2021, 10:21: IG1 off. Turbos off.

Tuesday, February 16, 2021, 11:21: Venting.

Aaron closed SV4 and the vacuum drop normally. Leak through SV5 as well.

Vacuum side

Tuesday, February 16, 2021, 13:42: The gas lines inside have been check. The inlet of the calibrated leak was not tighten properly and hence the large leak observed.  FIXED.

Tuesday, February 16, 2021, 13:42: The only leak remaining INSIDE the vacuum is the one on the FT side which for 200kPa is around 7e-6 atm cc /s. At this pressure, the undesired leak  is leak rate is around 1 %  of the one getting into the source.

Atmosphere side

Tuesday, February 16, 2021, 14:49: Some minor leaks in connection points around  1e-6 atm cc/s. Not much I can do without changing all connection to glands with metal gaskets.

Tuesday, February 16, 2021, 14:50: SV5 was leak check on its own, the gas goes through quite noticeable, no need to sniff with leak detector. SV1 leak checked and it works.

Tuesday, February 16, 2021, 14:52: Valves swapped, labels changed.

Tuesday, February 16, 2021, 15:17: Roughing.

Tuesday, February 16, 2021, 15:53: Turbos on.

Tuesday, February 16, 2021, 15:59: IG1 on

Tuesday, February 16, 2021, 16:29: IG1 @ 5.3e-5 and dropping. Already better than Friday/Saturday.

Tuesday, February 16, 2021, 16:53: IG1 @ 2.9e-5 T.

Wednesday, February 17, 2021, 16:53: IG1 @ 1.5e-6 T.

Wednesday, February 17, 2021, 16:53:  The Neon bottle seems to be empty. The leak on the lines were not as bad to have this happened. I suspect when squeezing the bottle I rotated the gauge enough to cause a leak there.

Wednesday, February 17, 2021, 17:00: Using a full nitrogen bottle, I confirmed that rotating the two-stage regulator causes a leak.

Wednesday, February 17, 2021, 18:00: Things look OK now. Water open. No response on vacuum. Will put power.

Wednesday, February 17, 2021, 20:00: Some items were timed out. Tried to recycle the PLC now all the items are red. Check tomorrow

Thursday, February 18, 2021, 15:01: With the help of Spencer Kiy, we tested the proper communication from python to epics.

Getting TSP:Q1 PV: successful both from the web application and jupyter notebook.

Setting TSP:Q1 PV: successful from the web application, failed jupyter notebook.

Issue fixed on the HLA server side

Setting TSP:Q1 PV: successful both from the web application and jupyter notebook.

Testing other potentially useful apps for ramping routines and a  customized "striptool".

HLA developments only available from the ISAC test stand's PC and Fernando's PC.

Thursday, February 18, 2021, 15:19: Gas lines roughed and refilled. Gauge reads -50 kPa. Absolute pressure is 50 kPa.

IG1 @ 9.7 e-7 T.

Thursday, February 18, 2021, 15:27: BIAS/EZL/EE @ 30/13/1.5 kV. No sign of instabilities as before. Bias current=0.08 mA.

This also means the leak, in this clean environment is fine.

Thursday, February 18, 2021, 15:28

Slightly drop in flow. Will check later as well.

Thursday, February 18, 2021, 15:37: BIAS/EZL/EE @ 35/13/1.5 kV.

Thursday, February 18, 2021, 15:39. Spark inside. Recover with no problem

Thursday, February 18, 2021, 16:27 : BIAS/EZL/EE @ 40/13/1.5 kV.

Thursday, February 18, 2021, 16:28: Spark

Thursday, February 18, 2021, 16:42:

 Thursday, February 18, 2021, 17:1: Logging water temperature and flow in the PC.

Thursday, February 18, 2021, 17:19: BIAS/EZL/EE @ 0.000 kV.

Thursday, February 18, 2021, 17:20: Auto-ramping TGHT/TBHT to

Thursday, February 18, 2021, 17:26: Anode is shorted. It seems that the  Ta capillary  is touching the HS. I have to open.

Thursday, February 18, 2021, 17:35: IG1 and turbos off.

 Thursday, February 18, 2021, 18:2: Venting

Thursday, February 18, 2021, 18:42: Gauge reader at the service cap is now at -40 kPa. A 10 kPa incursion over 4 hours.

Friday, February 19, 2021, 11:04: The anode still has a short, returning all previous jumpers. Short present.

Unhooked anode cable can sustain voltage, hence the electric circuit has a short,

Friday, February 19, 2021, 11:48: Target removed. No short on anode-target. However there is no short in the service tray either, the voltage from the anode supply is held with no problem.

Friday, February 19, 2021, 12:41: Only when the tbht is bolted the power supply goes current limited.

Friday, February 19, 2021, 12:44: Source tray can hold anode voltage without drawing any current, as expected.

Friday, February 19, 2021, 12:52: Target legs to HS presents a short. When HS is removed the short is gone. Will try to find the contact point.

Friday, February 19, 2021, 12:56: Suspecting that is the gas line that goes to the back of the TGHT; is too high and touches the HS. Putting and insulator and installing the HS cover. No short.

Removing the insulator there is a short.

Will bend the gas line.

Friday, February 19, 2021, 13:08: Installed the open assembly, and the anode voltage is held in the system without drawing current, as expected.

Friday, February 19, 2021, 13:21: TIS assy re-installed, short is fixed.

Friday, February 19, 2021, 13:28: Roughing

Friday, February 19, 2021, 13:43: Power on

Friday, February 19, 2021, 13:59: Turbos on

Friday, February 19, 2021, 14:07: IG1 on.

 Friday, February 19, 2021, 15:06:  Water open. No vacuum response.

Friday, February 19, 2021, 15:06: IG1 @ 3.13e-5 T.

Friday, February 19, 2021, 15:47 :

Friday, February 19, 2021, 15:48: IG1 @ 1.65 e-5 T

Saturday, February 20, 2021, 09:19. IG1 @ 1e-6 T

Saturday, February 20, 2021, 09:20: Auto-ramping TGHT/TBHT to 300,150 A @ 2A/min

Saturday, February 20, 2021, 13:26:  IG1 @ 1.78e-6 T

Saturday, February 20, 2021, 13:29: Anode @ 50 V. Coil @ 20 A. 

Saturday, February 20, 2021, 13:52: Bias voltage only reaches 6 kV, the bias current seems a bit unstable, not  sure now what the problem is.

Saturday, February 20, 2021, 14:58: Auto-cooling TGHT/TBHT to 0 A @ 2 A/min 

Sunday, February 21, 2021, 11:24: Auto-ramping TGHT/TBHT to 580/290A @ 2A/min  

Sunday, February 21, 2021, 16:39: Ramp up complete. IG1 @ 2.15e-6 T. 

Will wait until vacuum is stable to try  to put high voltage.

Sunday, February 21, 2021, 21:51: IG1 @ 2.06e-6 T.  Unable to go above 5 kV.  

Sunday, February 21, 2021, 22:00:  Auto-cooling TGHT/TBHT to 0 A @ 2 A/min 

Monday, February 22, 2021, 09:12: IG1@1.01e-7 T. Bias gets current limited as of 11 kV. The system does not spark so the current is leaking through somewhere.

Monday, February 22, 2021, 09:29: Grounding the TM2 F/T. No effects, same bias issues.

 Monday, February 22, 2021, 11:3: the only way for this instabilities to occur is with a short between ground and HV. No such touch is occurring inside.

Monday, February 22, 2021, 11:37: Instability reacts with punching the cage, that is, shaking up the cage causes the instability to decrease.

Will re-accommodate the cage as it seemed slightly crooked, hence the motivation to punch it.

Monday, February 22, 2021, 14:00: Cage re-accommodated with the help of Aaron. Move a insulating cable that was touching a FT.

Monday, February 22, 2021, 14:30: Now sparks are visible between the coil/HS waterlines and ground waterlines (see pictures attached). I have to open the vacuum chamber.

Monday, February 22, 2021, 14:54: IG1 off. Turbos off.

Monday, February 22, 2021, 15:49: Venting

Monday, February 22, 2021, 16:43: Made clearance between HS/COIL to GND.

Monday, February 22, 2021, 17:48 Roughing

Monday, February 22, 2021, 18:17: Turbos on.

Monday, February 22, 2021, 18:25: IG1 on.

Monday, February 22, 2021, 19:01: Gas lines refilled with |50 kPa| or argon. Gauge reads -40kPa.

Monday, February 22, 2021, 19:01: IG1@3.48e-5T

Monday, February 22, 2021, 19:01: Waterlines open

Monday, February 22, 2021, 19:06: IG1 @ 3.04e-5 T.

Tuesday, February 23, 2021, 08:34: IG1@1.56e-6T.

Tuesday, February 23, 2021, 08:43: BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 200 V. No problems with the bias ramp up.  I will wait some time in here just to make sure it's OK, but it looks like the problem is solved now.  

Tuesday, February 23, 2021, 08:52:  BIAS/EZL/EE/AND @ 0.000 kV.

Tuesday, February 23, 2021, 08:55: Auto-ramp up TGHT/TBHT to 580/290 @ 4A/min 

Tuesday, February 23, 2021, 09:35:  Gauge reads -20kPa, that is, there was  a 20 kPa air incursion over 18 hours.

Tuesday, February 23, 2021, 9:36: Roughing and re-filling the gas lines. Gauge reads again -40 kPa 

 Tuesday, February 23, 2021, 11:30: BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 200 V.

Tuesday, February 23, 2021, 11:31: IV4 open.

Tuesday, February 23, 2021, 11:47: Sparks when anode is @ 500 V. 

AS

Tuesday, February 23, 2021, 14:18: Mass & wire scans taken. Word doc attached.

FM

Tuesday, February 23, 2021, 22:17: All afternoon and evening running my code to get systematic measurements. They are still going but in summary:

For TGHT=580 A and TBHT=290 A, the temperature estimation is 1740 C, which is extremely cold for a FEBIAD. This explains why with this assembly I need to go around 310 to get something reasonable.

Tuesday, February 23, 2021, 22:52: Between 100 and 200 V the current always increases with coil current  > 50 A. The maximum increase factor is around 4. As the voltage increases the current stops increases at coil >50A.

 Tuesday, February 23, 2021, 23:59: Refilling gas lines.

TBHT to 310

Wednesday, February 24, 2021, 02:21: BIAS/EZL/EE/AND @ 0.000 kV:

Wednesday, February 24, 2021, 02:22: lowering tght/tbht to 520/250@ 4 A/min. 

Wednesday, February 24, 2021, 09:18: Opening cage to increase upstream pressure for the calibrated leak.. Will go to |100 kPa|

Wednesday, February 24, 2021, 09:26: No vacuum response.

Wednesday, February 24, 2021, 09:30: Cage locked.

Wednesday, February 24, 2021, 09:31: Auto-ramping TGHT/TBHT to 580/290 @ 4A/min

Wednesday, February 24, 2021, 09:42: BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 200 V.

Wednesday, February 24, 2021, 11:23 :Opening cage to increase upstream pressure for the calibrated leak.. Will go to |250 kPa|

Wednesday, February 24, 2021, 11:31: Actually my two-stage regulator limits how much higher I can go. Limited to |200kPa| for and Ar leak rate of 4e-6 mbar l /s.

Wednesday, February 24, 2021, 11:33: Gas line refilled, no vacuum response.

Wednesday, February 24, 2021, 11:34: Cage locked.

Wednesday, February 24, 2021, 11:37 : BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 200 V.

 Wednesday, February 24, 2021, 12:10: Mass scan completed.

Wednesday, February 24, 2021, 12:10: Auto-ramping TBHT to 310 A @ 2 A/min. This current should be around 1800-1850 C.

 Wednesday, February 24, 2021, 15:0: Temperature estimation says 1700 C, I wonder if the temperature is colde because of the high power target.

Wednesday, February 24, 2021, 15:02 : Argon signal is quite noticeable as roughing the gas lines drop the current down to 0 .

Wednesday, February 24, 2021, 18:55: Emittance scans have failed for both argon and m/q=28. It might be related to the very low intensity of the beam. FC0 reads ~10 nA at TBHT=310.

Change several parameters but only noise is recorded.

Wednesday, February 24, 2021, 18:57 Auto-ramping TBHT to 315 @ 1A/min

 Wednesday, February 24, 2021, 21:35: BIAS/EZL/EE/AND @ 0.000 kV:

Wednesday, February 24, 2021, 21:35: Cooling target @ 1 A/min

Thursday, February 25, 2021, 09:37: TGHT/TBHT @ 520,255 A IG1 @ 1.25e-6T. 

Thursday, February 25, 2021, 09:38: Auto-ramping TGHT/TBHT to 580/290 A @ 4 A/min 

Thursday, February 25, 2021, 09:46:  BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 175 V.

Thursday, February 25, 2021, 14:04: Efficiency is decreasing as TBHT current increases. This seems to be correlated to the apparent reduction in estimated temperature coming from the anode current readback.

This could indicate that the increase in TBHT current heats up the TGHT-TBHT system but given this is a HP target, maybe the heat is dissipated through the target.

On previous tests both at the isac test stand and the evaporator 2, I have seen the effect of tght current in cathode temperature.

I will lower the TGHT current and I will keep increasing the TBHT current to see what happens.

Thursday, February 25, 2021, 22:46: Several attemps for efficiency measurements as a function of temperature. Partially sucessful

Thursday, February 25, 2021, 22:47: TGHT/TBTH @ 450/290.

 Thursday, February 25, 2021, 22:48: BIAS/EZL/EE/AND @ 0.000 kV:

Friday, February 26, 2021, 08:55: IG1 @ 1.07e-6 T.

Friday, February 26, 2021, 09:00:  BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 175 V.

Friday, February 26, 2021, 17:20: All day running efficiency measurements as a function cathode input current.

With the colder target I estimated a maximum cathode temperature of 1820 coming from TBHT current=330 A.

Despite this being an estimated temperature from the anode drain current, the fact that the maximum total source beam current is only some tens of  nA, indicate very few electrons.

I finally managed tom take emittance measurements, so far the  parameters on the emittance rig page were not compatible with the tune I am using.

Friday, February 26, 2021, 19:26: Mass scan left running at this high temperature. 

MAss scan run at different coils

Friday, February 26, 2021, 23:18: Cooling TBHT to 290 @ 2 A/min.

 Friday, February 26, 2021, 23:19: BIAS/EZL/EE/AND @ 0.000 kV:

Saturday, February 27, 2021, 18:12: TBHT voltage stable, IG1 stable. Despite putting a lot of heat, the system seems to be OK.

Most of the day I have been setting up routines for automatic sweeps. 

they work fine

Sunday, February 28, 2021, 02:48: Experimental run will finish in about 1hr.

Code will set anode=5V and coil=0A.

Lot's of parameter mapping, efficiency measurements, some emittance scans, some rpms, some mass scans

Sunday, February 28, 2021, 23:12: Increasing voltage limit on the tbht heater from 3.001 to 3.5, just in case is necessary to reach 340 A. 

bunch of mass scans run.

Monday, March 01, 2021, 05:02: BIAS/EZL/EE/AND @ 0.000 kV:

Monday, March 01, 2021, 05:0: Auto-cooling TGH/TBHT to 0 A at 2 A/min 

AS

Monday, March 01, 2021, 09:00: Coil from 90 to 0 A. Power / sources off.

Monday, March 01, 2021, 09:02: IV4 closed / reset

Monday, March 01, 2021, 09:05: IG1 & Turbo pumps off.

Monday, March 01, 2021, 09:07: Purge FS#5

Monday, March 01, 2021, 10:44: Vented

 Monday, March 01, 2021, 12:57: Roughing

Monday, March 01, 2021, 13:30: Turbos on. Started a bit late as I was distracted. They were ready at around 13:26

Monday, March 01, 2021, 13:41: IG1 on. 

 Monday, March 01, 2021, 14:08: Pumping aborted. I will install the ExTorr RGA available

Monday, March 01, 2021, 13:00 ExTorr RGA installed (e-log 859)

Monday, March 01, 2021, 16:07:Roughing 

Monday, March 01, 2021, 16:37: Turbos on. 

Monday, March 01, 2021, 16:46: IG1 on. 

Monday, March 01, 2021, 17:25: RGA on, recording trendlines 

Monday, March 01, 2021, 17:43: IG1 @ 1.1e-5 Torr

Monday, March 01, 2021, 17:43:  Waterlines open. No response on RGA nor striptool.

Monday, March 01, 2021, 18:20: Power/Optics on.

Monday, March 01, 2021, 19:02: IG1 @ 5.2e-6

Monday, March 01, 2021, 19:20: RGA shows a clear response on the opening and closing of the gas lines.

Monday, March 01, 2021, 19:53: IG1 @ 3.76e-6 T

Monday, March 01, 2021, 19:53: Auto-ramp up TGHT/TBHT to 580/290 @ 2 A/min.

Monday, March 01, 2021, 19:57: BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 150 V, coil current @ 0 A.

Tuesday, March 02, 2021, 07:43: IG1 @ 2.96e-6T. 

Tuesday, March 02, 2021, 11:03: System tripped 

Tuesday, March 02, 2021, 11:06: Vacuum started to increase when coil was set to 80 A.

Tuesday, March 02, 2021, 11:08: IG1 started to drop as soon as the system tripped, this indicates that this was not a vacuum incursion from the gas or water but rather something related to heat.  Maybe some copper from the coil melted.

AS  checked thing were OK (see elog 860)

Tuesday, March 02, 2021, 12:35: Auto-ramp up TGHT/TBHT to 580/290 @ 4 A/min.

Tuesday, March 02, 2021, 15:25: IG1 @ 1.66e-7 T.

Tuesday, March 02, 2021, 15:26: Increasing coil current, response in vacuum. RGA increases mass 44 ( CO2).

* The coil jacket is made of fiberglass, that Si with mass 28. Hence,  the CO/N2  signal will increase if the jacket starts sublimating.

**from the future SiO with a mass of 44 will show an increase in "CO2" signal

Tuesday, March 02, 2021, 15:34: Coil @ 30 A IG1 @ 2.15e-6 T.

max IG1 = 2.25e-6T

Will remain at this current until vacuum  starts decreasing.

 Tuesday, March 02, 2021, 15:50:  BIAS/EZL/EE @ 30/13/1.5 kV, anode bias @ 150 V

Tuesday, March 02, 2021, 17:23: IG1 @ 2.15e-6 T. 

Tuesday, March 02, 2021, 17:26: Coil @ 40 A. 

Tuesday, March 02, 2021, 17:33: Coil @ 45 A 

max IG1 = 3.3e-6 T.

Tuesday, March 02, 2021, 18:39: IG1 @ 2.68e-6 

Tuesday, March 02, 2021, 18:40: Coil to 55 A. 

max IG1 = 3.87e-6 T

Tuesday, March 02, 2021, 20:07: IG1 @ 2.6e-6 T.

 Tuesday, March 02, 2021, 20:07: Coil to 60 A.

max IG1 = 3.07e-6 T

Tuesday, March 02, 2021, 21:25: IG1 @ 2.59e-6T 

Tuesday, March 02, 2021, 21:25: Coil to 70 A. 

 max IG1 = 4.1e-6 T

Tuesday, March 02, 2021, 22:31: IG1 @2.76e-6 T.

 Tuesday, March 02, 2021, 22:32: Coil @ 80 A.

 max IG1 = 4.35e-6 T

Tuesday, March 02, 2021, 23:31: IG1 @ 2.68e-6

Tuesday, March 02, 2021, 23:32 Coil @ 90 A. 

  max IG1 = 4.26e-6 T

Wednesday, March 03, 2021, 00:33: IG1 @ 2.68e-6 T.

Wednesday, March 03, 2021, 00:33: Coil to 100 A.

Voltage limited. Increasing from 1 A to 1.1 A.

  max IG1 = 3.87e-6 T

Wednesday, March 03, 2021, 01:03: IG1 @ 3.23e-6 T.

Will let sit on here until it outgasses 

  max IG1 = 3.87e-6 T

Wednesday, March 03, 2021, 07:27 : IG11.59e-6 T.

Wednesday, March 03, 2021, 07:28: Coil @ 110 A.

Voltage limited. Increasing from 1.1 A to 1.2 A.

 Wednesday summary: tght remained at 400 A. Several tbht, anode, and coil scans. Went up to 345 on the TBHT, the current on the cathode was above 250 mA for a voltage of around 300 V. I stopped there as the large electron current could melt the grid.

Thursday, March 04, 2021, 08:43: Re taking some points from yesterday 

Took several mass scans and emittance scans

Friday, March 05, 2021,

Investigated beam composition at different temperatures, I couldn't find a peak that is affected by argon injection. species with m/1 above 50 u only appear with tght>580 and tbht>295. These values are a bit tricky to work on as the FEBIAD has melted before near these values.

I will continue mass scans, emittance, and efficiency measurements.  On the last day I will push towards higher temperatures.

Saturday, March 06, 2021,

Investigating beam composition. Mass scans and the parameter sweep on the dominant peaks both with and without gases.  THBT is at 315 A.

Sunday, March 07, 2021:

Investigating  Ar++ both with and without gas.

Investigating  Ta++

Sunday, March 07, 2021, 11:15: TBHT to 320 A @ 2A/min 

Sunday, March 07, 2021, 11:45: During a parameter scan, epics cut communication with my notebook. It seems like the HLA server might be down :/ 

Sunday, March 07, 2021, 12:32: Discussed with  Spencer, he was upgrading jaya. Now things are up and running gain. 

Sunday, March 07, 2021, 13:36:  Ar+++ observed now at mass ~13.33 u, with a current of 3e-10A.

Sunday, March 07, 2021, 16:32: TBHT to 325 A @ 1A/min  

Sunday, March 07, 2021, 20:06: Emittance measurements for same efficiency parameters of anode, coil. The tail of the emittance gets larger on some combinations. 

Sunday, March 07, 2021, 20:07: TBHT to 330 A @ 1A/min  

Sunday, March 07, 2021, 20:22: After increasing the TBHT to 330 A, the anode leakage current started to drop, this hasn't happened before. The TBHT  voltage look stable so I don't think the cathode is failing ...yet 

systematic measurement of emittance: fixed anode sweeping coild, and also fixed coil sweeping anode

Monday, March 08, 2021, 01:55: Investigating 39K at very low voltages. Taking emittance measurements and RPMs. 

Monday, March 08, 2021, 02:25: Anode@ 0V Coil @ 50A. FC0 in 

Monday, March 08, 2021, 07:22:  TBHT to 335 A @ 1A/min  

Monday, March 08, 2021, 09:48: Water cooling values. The temperature on the HS are likely higher because of the high temperature we are running the ion source. The flow on TBHT seems lower compared to what was registered on elog 856

Monday, March 08, 2021, 10:44: At anode voltgae aroun 400 the system got unstable in high voltage, likely due to almost 600 mA being sink on the anode PS.

Monday, March 08, 2021, 10:45 : TBHT to 331 A @ -1A/min 

Monday, March 08, 2021, 13:38:

 08-Mar-21 16:47:54    32.463    3.517    21.183    2.701    22.075    1.61    23.494    4.918    

Tuesday, March 09, 2021: 

Investigating doubly charged species, increase tbht in steps of 1A. Anode voltage gets limited at around 300 V due to the high electron current

Tuesday, March 09, 2021, 08:30: TBHT to 340 A. 

Tuesday, March 09, 2021, 10:27: TBHT to 341 A. 

Tuesday, March 09, 2021, 11:26:  TBHT to 345 @ 1A/min 

Tuesday, March 09, 2021, 15:50:  TBHT to 350 @ 1A/min. I think above this value there will be an anode-cathode short, or the transfer line will melt.

 Tuesday, March 09, 2021, 17:1: TBHT to 360 @ 1A/min.

Tuesday, March 09, 2021, 19:26: TBHT to 370 @ 1A/min.

Tuesday, March 09, 2021, 19:32: TBHT voltage increasing but not the current. Increasing the TBHT voltage from 3.5 to 4 V. 

Tuesday, March 09, 2021, 20:17:  358 A is stable, 359 A is a bit jumpy, but 360 A is quite jumpy.

Tuesday, March 09, 2021, 20:29: CG1A reached 1 T, tapping down from 363 to 361. 

Wednesday, March 10, 2021, 00:20: It has been quite challenging to reach 370 A on the TBHT, the highest current reached is 368 A. At this current, it seems that an efficiency flattening has definitely started.

Wednesday, March 10, 2021, 00:21: Bringing TBHT to 325 A @ 2A/min

After a spark and during the last bit of the scan, it seems the anode shorted. The source is dead :/

 Wednesday, March 10, 2021, 02:43: Auto-cooling TGHT/TBHT to 0 A  @ 2A/min

Wednesday, March 10, 2021, 02:49: IV4 closed 

Wednesday, March 10, 2021, 02:49: IV4 timed out. 

Wednesday, March 10, 2021, 02:51: Cooling aborted.

 Wednesday, March 10, 2021, 02:51:  Auto-cooling TGHT/TBHT to 0 A  @ 4A/min

Wednesday, March 10, 2021, 02:55: Biases to 0 kV. 

Wednesday, March 10, 2021, 03:1:  Cooling aborted.

Wednesday, March 10, 2021, 03:11   Auto-cooling TGHT/TBHT to 0 A  @ 10A/min

Wednesday, March 10, 2021, 03:20: Short is not present anymore. Anode can hold voltage. 

 Monday, March 01, 2021, 16:03: An ExTorr RGA has been installed in the ISAC test stand.

The original SRS 100 is still broken ( e-log 778)

The SRS 100 from the conditioning station will not be available this week.

Wednesday, June 30, 2021, 19:08: Roughing

Thursday, July 01, 2021, 08:57: Turbos on 

Thursday, July 01, 2021, 09:11: TP1A timed out. Reset it. Waiting for CG1A to drop a bit more. 

Thursday, July 01, 2021, 09:19: TSG:BV1A interlock bypassed so that can be opened. TSGTP1A open

TP1A at speed

Thursday, July 01, 2021, 09:20: Interlock bypassed was removed.

Thursday, July 01, 2021, 09:20: IG1 on. 

Wednesday, July 07, 2021, 08:52 : IgG1 @ 4.64e-7 T.

Wednesday, July 07, 2021, 08:53: Waterlines open. No vacuum response. RGA does not respond, probably the filament burnt out.

Wednesday, July 07, 2021: Gas system has a tiny leak, probably from my initial checks about two weeks ago

Wednesday, July 07, 2021: During adjustments on the gas system the copper pipe yielded a bit and the leak clearly increases. I asked Maico to prepare new VCR connection for replacement (thanks!)

Thursday, July 08, 2021: The gas system inside the Faraday cage is not leaking anymore. However, the gauge inside the service cap does not respond to any pressure changes. It needs replacement.

Friday, July 09, 2021: Gas system troubleshooted with a small nitrogen bottle. Problem was on the two-stage regulator. Tighter connection fixed it.

Power supplies respond normal

Friday, July 09, 2021, 15:19: IV4 open.

Emittance meter power supply on.

Friday, July 09, 2021, 15:22: IG1 @ 4.40e-7 T.

Friday, July 09, 2021, 15:22: Auto-ramping TGHT/TBHT to 300 A / 150A @ 2A/min

Friday, July 09, 2021, 16:06: Emittance meter was not workin. Mike Rowen rebooted the IOC and that fixed the issue.

 Sunday, July 11, 2021, 16:40: IG1 @ 5.13e-7 T.

Sunday, July 11, 2021, 16:42:  Auto-ramping TGHT/TBHT to 550A / 250A @ 2A/min

Sunday, July 11, 2021, 16:43. Anode @ 100 V and  500 mA current limit. 

Monday, July 12, 2021, 09:15: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. - AS

FM

Monday, July 12, 2021, 09:41:  Auto-ramping TGHT/TBHT to 580A / 280A @ 2A/min

There seems to be an issue with the emittance meter. The scans seems to be successful but the plot is only noise.

Tuesday, July 13, 2021, 11:51: Telescope set on the magnet viewport: Grid is fine and I will check it continuosly.

The gauge inside the service cap is working now, as it actually never broke, a manual valve was still close inside the faraday cage.

I measured the voltage sent from the emittance PS, so the emittance meter receives voltage. I think the problem might be the faraday cup, either internally, or with the signal.

Tuesday, July 13, 2021, 15:54: Venting the beamline after the magnet to re-install the mass slit.

HV off

Tuesday, July 13, 2021, 16:19: TMS:BV6 open.

Tuesday, July 13, 2021, 16:21: TMS:BV2 open.

Tuesday, July 13, 2021, 16:27: TMSTP6 and TMSTP2 on.

Tuesday, July 13, 2021, 16:32: TMSIG6 On.

Tuesday, July 13, 2021, 16:40: HV on.

 Wednesday, July 14, 2021: Troubleshooting the emittance meter. I think I saw some indications of beam so it might be that I just need more intensity for a proper measurement.

Moving on, I tested the code as I want to implement a a couple of things: record a bidimensional anode current to make sure I capture any chance with the coil (if any), use temperature estimation from heating power as well.

When running a magnet-anode scan on sodium I triggered the high efficienct regime. This indicates that the cathode is either hotter or closer. With 280 A I am inclined on the latter.

The regime is unstable as the voltage fluctates as well as the ion current. Over a period of two hours

Friday, July 16, 2021, 12:08: Hv off to increase upstream pressure from |200| to |240| kPa, which is the maximum I can achieve with my two-stage regulator.

Friday, July 16, 2021, 12:15: Mass scan.

Friday, July 16, 2021, 13:54: TBHT to 260 @ -2A/min.

 Friday, July 16, 2021, 14:09: HV off.

Friday, July 16, 2021, 14:17: BIAS / EE / EZL @ 30 / -1.5 / 12.5 kV.

Friday, July 16, 2021, 14:17: Mass scan ongoing. Done for the day (on-site)

Saturday, July 17, 2021: Mass scans in both normal and anomalous regime.

Sunday, July 18, 2021, 07:42: Found TSG:CBC in a red state. Using the cfg button on the canbus utilities does not work. Likely the canbus card needs to be replaced.

Monday, July 19, 2021: AS fixed the CBC

Increased anode current limit to 600 mA. More ion current.

Anode voltage setpoint=500 A, anode voltage readback=250 V.

Moving the setpoint to 250 causes no effect. But when moving the setpoint to 245 V, the ion current, and the drain current decrease.

Putting together previous findings to discuss what to do next.

Grid still fine.

Tuesday, July 20, 2021, 17:22:   TBHT to 240 @ -2A/min.

Around 16:30 there was a slight target voltage drop. This coincided with the anode getting current limited (500mA) at 100V.

 Tuesday, July 20, 2021, 17:47:  IG1 reacts to the "sparks" observed on the anode leackage current.

Lowering the anode voltage to 0 V. I'll go on-site tomorrow to check the state of the grid and to check if there are visible sparks inside the chamber.

Wednesday, July 21, 2021, 12:40: entries from early today lost I'll try to summarize what has happened:

grid still fine

Manually sweeping the anode but no visual of any kind inside the vacuum. IG1 still reacts to sudden increase of leakage current but nothing observed inside the vacuum chamber.

 anode leakage current responds to decreasing the target heating current when lowering to 235A.

When going to 200 A, the anode leakage current drop to 0 mA when the cathode reached 211.

Now the cathode gets current limited as of 1 V.

grid still fine.

Wednesday, July 21, 2021, 12:44: TGHT/TBHT to 0 A @ -2A/min 

 Wednesday, July 21, 2021, 14:43: TBHT @ 0 A, TGHT @ 340 A. Setting the anode voltage to 500 V has a leakage current of 102.5 mA.

Wednesday, July 21, 2021, 22:19: IV4 closed

 Wednesday, July 21, 2021, 22:21:  BIAS / EE / EZL @ 0.000 kV.

Wednesday, July 21, 2021, 22:22:  IG1 off. Turbos off.

Thursday, July 22, 2021, 10:44: Venting:

 Thursday, July 22, 2021, 17:43: Roughing

New argon gas bottle installed.

Thursday, July 22, 2021, 18:16: Turbos on.

Thursday, July 22, 2021, 18:25: TP1A  timed out. TSG:CG1A is larger than TSG:CG1, that is the roughing lines are higher than the vacuum chamber. 

Thursday, July 22, 2021, 18:27: Bypassing TSG:BV1 to open it.

Thursday, July 22, 2021, 18:28: Turbo at speed.

Thursday, July 22, 2021, 18:28: Bypass removed.

Thursday, July 22, 2021, 18:28: IG1 on. 

Friday, July 23, 2021, 09:16: IG1 @ 1.69e-6 T.

Friday, July 23, 2021, 09:17: Waterlines open. No vacuum response

Friday, July 23, 2021, 10:09: While checking the gas connections I found out that inside the faraday cage there are a couple of connections missing:

Coil PS chasis ground disconnected

Resistor between  A and C (tbht pos and tght neg) disconnected.

Friday, July 23, 2021, 15:29: Gas system taken out to properly install a new "tee" union.

Friday, July 23, 2021, 15:29: IG1 @ 1.34e-6 T.

Friday, July 23, 2021, 15:52: Power/ sources on.

Friday, July 23, 2021, 15:54: Auto-ramping TGHT/TBHT to 580 A/ 280 A @ 2A/min

Friday, July 23, 2021, 15:58: IV4 open.

Saturday, July 24, 2021, 13:07: IG1 @ 1.25 e-6 T. 

Saturday, July 24, 2021, 18:34: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. One spark when Bias reached 30 kV.

Saturday, July 24, 2021, 18:36: Two consecutive sparks. Lowering to bias  29.5  kV to let it conditioned there for at least 10 minutes.

Saturday, July 24, 2021, 18:46: Bias to 30 kV. No sparks. 

Saturday, July 24, 2021, 18:59. No sparks. IG1 @ 1.16e-6 

Saturday, July 24, 2021, 19:26: Anode gets current limited  as of 2 V. Maybe there is a short somewhere else either inside the vacuum box, or on the service cap. Will check tomorrow

Saturday, July 24, 2021, 19:30: BIAS / EE / EZL @ 0 kV.

Saturday, July 24, 2021, 19:30: Auto-cooling to 0 A @ -2A/min

Monday, July 26, 2021, 09:00: IG1 @ 4.58e-7 T.

Monday, July 26, 2021, 09:17: No visible sparks 

Monday, July 26, 2021, 09:22: Power sources off. 

Monday, July 26, 2021, 13:20: After some tests I can conclude a couple of things:

• Anode/Cathode voltage power supply works fine and draws the right current for a 100 kOhm resistor. 
• When all cables are disconnected from TBHT and TGHT F/Ts there is continuity between them and HV common.

Monday, July 26, 2021, 14:52: IV4 closed

Monday, July 26, 2021, 14:53: Turbos off.

Oops!, forgot to turned off IG1 but interlock did it for me :p

 Monday, July 26, 2021, 17:19: After opening the vaccum chamber I found the portion of the capillary that goes to the target was touching the heatshield. Confirmed continuity with a multimeter.

Manually move it away and no continuity confirmed with multimeter.

FTs A-D recconected.

Bypassing anode interlock to check there is no short. Confirmed.

Preparing to close and pump.

 Monday, July 26, 2021, 17:23: Roughing

Monday, July 26, 2021, 17:55: Turbos on.

Monday, July 26, 2021, 18:03 : TP1A timed out ...again

Monday, July 26, 2021, 18:03: Bypassing BV1A. TP1A reset and on. turbos at speed.

 Monday, July 26, 2021, 18:05: IG1 on.

Monday, July 26, 2021, 18:26: IG1 @ 1.97e-5 T. 

Monday, July 26, 2021, 22:33: IG1 @ 2.41e-6 T

Monday, July 26, 2021, 22:33: IV4 open. 

Monday, July 26, 2021, 22:55: BIAS/EZL/EE to 10/6/1 kV. No problem. All set to 0.000 kV again 

Monday, July 26, 2021, 22:57: Coil to 10 A. Anode to 100 V.. No problem. All set to 0 again.

 Monday, July 26, 2021, 22:59: Auto-ramping TGHT/TBHT to 580/280 A @ 2A/min.

Tuesday, July 27, 2021, 06:32: IG1 @ 1.52e-6 T.

At 01:30, approximately 10 minutes after TBHT heater reached the desired current, the anode went from 0 to 1.5 V.

Tried to put anode voltage to 100 V but it got current limited as of 2 V.

Given that before heating the anode voltage was fine, I think the gas tube move again and made contact with the heatshield.

I will need to open this again :(

 Tuesday, July 27, 2021, 06:41: Auto-cooling TGHT/TBHT to 0 A @ -4A/min

Tuesday, July 27, 2021, 09:08: Heaters @ 0 A. Anode still gets current limited.

Tuesday, July 27, 2021, 09:09: IV4 close. Timed out. 

 Tuesday, July 27, 2021, 09:09: IG1 off.

Tuesday, July 27, 2021, 09:09: Turbos off. 

Tuesday, July 27, 2021, 11:13: Venting.

Tuesday, July 27, 2021, 11:58: Gas tube move and end up touching the  heatshield again. When try to adjust it to add an insulator as an spacer, the gas line de-coupled from the target.

removing the target for re-installation and clearance addition.

 Replace Ta capillary going into the target with the one from previous febiad as it felt sturdy and had better shape for clearance with the HS.

Assembly has new gas tube to the target for better fit and clearance to the HS.

Electric checks before closing shows no short between TIS and HS.

Tuesday, July 27, 2021, 12:57: Venting

Tuesday, July 27, 2021, 13:28: Turbos on. 

TP1A timed out again! Bypassing BV1A to open it, then reset TP1A and turn  it on.  Turbo show that is at speed right away.

Tuesday, July 27, 2021, 13:38: IG1 on

Tuesday, July 27, 2021, 15:24: IG1 @ 7.07e-6.

Tuesday, July 27, 2021, 15:28: Waterlines open. No vacuum response.

Tuesday, July 27, 2021, 15:33. IV4. Timed out a couple of times.

Tuesday, July 27, 2021, 15:37: Power/Sources on.

 Tuesday, July 27, 2021, 17:57: IG1 @ 2.76e-6 T.

Tuesday, July 27, 2021, 18:04: Auto-ramping TGHT/TBHT to 560/280 A. @ 2A/min. 

Wednesday, July 28, 2021, 00:46: Found out that anode got current limited around 9 pm. I wonder if the tube got moved again

Wednesday, July 28, 2021, 00:48: Auto-cooling to 0 A to investigate. 

 Wednesday, July 28, 2021, 06:44: IV4 closed

Wednesday, July 28, 2021, 06:44: IG1 off. Turbos off. 

Wednesday, July 28, 2021, 08:01: Venting.

 Once more, the tube was touching the heatshield in the same way as before.

• The cause is likely the spiral line coming from the VCR as in "rest" state in pointing towards the grip handles.
• I was trying to put an insulator piece and I noticed (and recall) how much force I had to put in order to accommodate the spiral  line in order to align it with the target capillary.
• This lead me to think that when the targets gets hot and the capillary deforms, this will be pushed towards the HS.
• To fixed it, I modified the spiral to have less torque or at least make it push to the other side (touching the tbht is no problem).

Closing everything and pumping down.

Modified spiral tube from VCR to counteract torque towards the HS. Now points towards TBHT.

Electric checks before closing shows no short between TIS and HS.

Wednesday, July 28, 2021, 08:48: Venting

Wednesday, July 28, 2021, 09:18 Turbos on. 

Wednesday, July 28, 2021, 09:26: IG1 on. TP1 didn't timed out.

Wednesday, July 28, 2021, 10:24: IG1 @ 4.13e-6 T. All voltages can be set with no problem.

Wednesday, July 28, 2021, 11:48: IG1 @ 1.98e-6 T. Anode @ 10 V.

Wednesday, July 28, 2021, 11:49: Auto-ramping TGHT/TBHT to 560/280 A @ 4A/min. 

Wednesday, July 28, 2021, 14:10: Heaters reached setpoints. No shorts!

Wednesday, July 28, 2021, 14:14: IG1 @  1.71e-6 T.

Wednesday, July 28, 2021, 14:30: Spark when ramping voltage @ 20 kV.

Wednesday, July 28, 2021, 14:30: IV4 open. 

Wednesday, July 28, 2021, 14:32: Bias/ EZL/EE @ 30/13/1.5 kV. Anode @ 0 V.

Wednesday, July 28, 2021, 14:33: FC0 = 1.09e-10 A 

 Wednesday, July 28, 2021, 14:34: IG1 @ 1.62e-6 T.

Wednesday, July 28, 2021, 14:35:  Auto-ramping TGHT to 580 A @ 4A/min. 

Wednesday, July 28, 2021, 14:48: IG1 @1 .60e-6 T 

Wednesday, July 28, 2021, 14:48: FC0 = 2.35e-10 

Ready to start systematic measurements.

 Wednesday, July 28, 2021, 15:00: Mass scan with anode = 0 V started.

Couple more mass scans, and parameter scans with a python notebook.

Wednesday, July 28, 2021, 20:37:   Auto-ramping TBHT to 285 A @ 2A/min. 

Thursday, July 29, 2021, 11:46: Manually tapping to 279 A as this provides a similar power to an older measurement. Even though the anode-cathode gap distance might be different, this is a preliminary measurement to make sure things look relatively similar. 

 Thursday, July 29, 2021, 21:38: Most of the day I was running parameter scans with similar parameter to an older measurement.

For this I varied TBHT and TGHT and some look closer than other, which indicates how much the sources varies from each other.

I tried running an emittance measurement but it seems the voltage is not been swept. I need to check if the power supply is working.

 Thursday, July 29, 2021, 21:38: TBHT to 270 A  @ -2A/min. TGHT @ 580 A

Friday, July 30, 2021, 09:57: Things stay fine overnight and only TPS:CBC was found off . The plan for today is the following:

• Check grid integrity
• Flush and refill gas line
• Start systematic measurements at low temperature.
  • Mass scan nominal values of coil and anode
  • Anode-coil scans
  • Mass scan interesting points
  • Emittance scan interesting points

 Friday, July 30, 2021, 11:43: Grid is fine. Voltages to 0 to  open cage.

Friday, July 30, 2021, 11:44:  Gas lines flushed and refilled with a pressure of |200| kPa. Similar to older measurements. It seems that yesterday measurements were with |240| kPa.

Friday, July 30, 2021, 11:51: Noticed that TP6 was red. Likely a consequence of a spark. Not sure since when. The vacuum seem ok before. 

Friday, July 30, 2021, 11:55: TP1A interlock due to vacuum on CG1A. When opening it the system pressure peak and trip the heaters :/. Waiting for the backing lines to evacuate before heating again.

 Friday, July 30, 2021, 14:39: TSG:CG1A&B are not coming down. Bypassing TSG:BV1A increase the pressure reading on IG1, indicating that the signal is real. The question is why there is such buildup in the backing lines.

Digging the archive this seems common but only after march 2021, the pressure does not decrease as good as before. This matches a big water leak. Maybe a new pump is needed as it was the case in August 2020.

Friday, July 30, 2021, 14:49: IG1 off. TP1B off. 

Friday, July 30, 2021, 16:05: Backing lines @ 0.025 T. An order of magnitude decrease after swapping RP1 (see elog 889).

Turbos on, IG1 On. Things look to be ok again. TP1A epics readback is 9.92 A at all times but controller reads 6 A upon start (normal) and at full speed reads 0.7 A (normal). To check with control group.

Friday, July 30, 2021, 16:14: IG1 @ 7.02e-7 T.

Restarting everything after swapping RP1 (see elog 889).

Friday, July 30, 2021, 16:14: IG1 @ 7.02e-7 T.

Friday, July 30, 2021, 16:26: IV4 open. IG1 @ 6.3e-7 T.

Friday, July 30, 2021, 16:27: Auto-ramping TGHT/TBHT to 540/270 A @ 4A/min.

Friday, July 30, 2021, 16:32: Emittance meter power supply found at 500 V. Running a scan does not weep the voltage.

Cycling the PS and running a  scan. Now the voltage is swept.

Friday, July 30, 2021, 17:43: TBHT reached set current. TGHT @ 304 A and ramping up. IG1 @  6.36e-7 T. TIS glowing so I guess it didn't break from early trip.

Friday, July 30, 2021, 18:53: IG1 @ 7 e- 7 T.

Friday, July 30, 2021, 18:53 : Auto-ramping TGHT to 580A @ 4A/min.

Friday, July 30, 2021, 19:10. TGHT reached set current. IG1 @ 7.35e-7 T.

Friday, July 30, 2021, 19:22: BIAS/EZL/EE @ 30/13/1.5 kV. 

Friday, July 30, 2021, 19:25: IG1 @ 7.55e-7 T.

Friday, July 30, 2021, 19:26 :  Auto-ramping TBHT to 280A @ 4A/min.

 Friday, July 30, 2021, 19:29: TBHT reaches set current. IG1 @ 7.72e-7 T.

Friday, July 30, 2021, 21:24: Mass scans with gas on/off shows clear only contribution from gas line. 

Friday, July 30, 2021, 21:25: Anode=200C,Coil=30A. FC0=5.14e-9 A. FC6=9.35e-10 A for 40Ar+

Parameter scans performed on nominal heater current and also with heater at similar power to older measurements.

Leaving some devices that are typically at 0 V to something like 1 to 2 volts, to avoid the red 0 readback as a test.

Saturday, July 31, 2021, 08:13: System stable overnight. TMS:VCB5 was the only device found off.

Mass scans, anode-coil scans. gas line effects.

Sunday, August 01, 2021, 08:42: On-site: Grid is fine. Gas pressure stays at |200kPa| even after several line flushes. Continuing  remotely.

Several parameter scans all at 280A. All of the look remarkably similar, so reproducibility over two day is possible.  Mass scans at three different coil-anode combinations

Emittance scans still not possible @ 1.3e-9 A on FC6, when going to 290 A will try again.

Sunday, August 01, 2021, 22:52: IG1 @ 8.43e-7 T.

Sunday, August 01, 2021, 22:53:  Auto-ramping TBHT to 290A @ 4A/min.

Monday, August 02, 2021, 01:00: IG1 @ 860e-7T. FC1=1.59e-8.

Monday, August 02, 2021, 08:59: IG1 @ 7.44e-7 T.

Mass scans performed. Emittance scans are still not possible with FC6=2.2e-9 A. Parameter scans

 Monday, August 02, 2021, 09:02:  Auto-ramping TBHT to 300 A @ 4A/min.

Emittance scans are still not possible with FC6=3.1e-9 A

 Monday, August 02, 2021, 12:48: IG1 @ 7.6e-7 T.

Monday, August 02, 2021, 12:48:  Auto-ramping TBHT to 305 A @ 2A/min.

Monday, August 02, 2021, 16:40: IG1@ 8.01 e-7 T. 

 Parameter scans. Mass scans performed. Emittance scans are still not possible with FC6=6.21e-9 A. I think there is something wrong with the parameters or with the hardware. To check with Carla on Tuesday.

 I will take one more measurement at higher current and go tomorrow to check the emittance scan status.

Monday, August 02, 2021, 20:46:  Auto-ramping TBHT to 310 A @ 1A/min. IG1 @ 8.16e-7 T.

 Parameter scans. Mass scans. 

Monday, August 02, 2021, 23:47: IG1 @ 8.07e-7 T. FC0 = 3..8e-8 A.

Monday, August 02, 2021, 23:52:  Done for the day.

Tuesday, August 03, 2021, 07:34: Things were stable overnight. IG1 @ 7.92e-7 T. 

Parameter scans, and emittance meter troubleshooting.

Grid is fine.

Tuesday, August 03, 2021, 11:55: Emittance scans seem to work now( see e-log 891) 

Tuesday, August 03, 2021, 12:08: Done on-site. Continuing remotely. 

Emittance scan. Mass scans.

Tuesday, August 03, 2021, 20:21: Ramping TBHT to 315 A @ 1A/min. IG1 @ 8.2e-7 T.

Parameter scan. Mass scans. Emittances scans.

Tuesday, August 03, 2021, 22:55: IG1 @8.07e-6. Done for the day. Will continue tomorrow.

Wednesday, August 04, 2021:  Parameter scan. Mass scans. Emittances scans.

Data analysis on files generated so far. Efficiency as a function of temperature-voltage look similar.

Given that previous cathode heating current did not have emittance, I will go down to measure efficiency.

Thursday, August 05, 2021: Morning troubleshooting CANBUS signal with no luck (this is actually something good)

Mass scans. Parameter scans, and finally emittance scans at lower temperatures.

Thursday, August 05, 2021, 20:58: IG1 @ 7.35e-7 T. 

Friday, August 06, 2021: CANBUS analyzer up-and-running.

Parameter scan. Mass scans. Emittances scans.

Saturday, August 07, 2021, 06:00:  Found all my epics windows closed. Probably a network issue as I cannot connect from any of my pc's. Submitting a ticket.

 Saturday, August 07, 2021, 08:43: Reply from Steve McDonald says there are general network issues and someone is goin on-site to investigate the "network switch stack in the ISAC2 second floor"

Saturday, August 07, 2021, 10:12 : Communications restore after fix.

Saturday, August 07, 2021, 15:06: FC0 reading oscillates a lot and sometimes drop to 0. Mass scan shows almost no peaks without gas. With gas, the FC0  behaves the sames even thought 40Ar+ signal is 1e-8A and responds to the gas open/close.

Moreover, the RPM0s have an offset current. RPM0A is not showing beam.

I will turn the HV off in case there is weird dark current going on. 

Saturday, August 07, 2021, 17:29 : On-site

ISAC test stand PC lost connection to epics due to the same issue. Initiating striptools.

Nothing visible wrong on service cap nor around the ISAC test stand, however, FC0 still oscillates a lot.

I will change the signal cables to see if one controller can read from the other faraday cup.

 Things look better now (see entry 893)

Finished mass scans

Sunday, August 08, 2021, 00:35: Ramping TBHT to 300 A @ 4 A/min. IG1 @ 6.71e-7 T. 

Sunday, August 08, 2021:  Parameter scans, mass scans, emittance scans performed.

Sunday, August 08, 2021, 23:55: Checking other species given that  with TBHT=310 A I can see m=90, which I think it might be Ta++

Monday, August 09, 2021: TBHT increased to 315 A

Parameter scans, mass scans, and emittance scans performed.

Investigating the following species: O+, (H2O)+, Ar++, (N2)+/CO+, (O2)+,Ta++,(TaO)++ on masses 16,18,20,28,32,90,98, respectively.

Both the atomic, and molecular oxygen follow different tendencies wrt other species.

Tuesday, August 10, 2021, 09:57: TBHT @ 320 A. IG1 @ 6.53e-7T. 

Tuesday, August 10, 2021, 10:01: Increasing anode limit current to 200mA. All previous tests had 150 mA and the maximum current recorded was ~110mA. 

Tuesday, August 10, 2021, 11:42: Grid is fine (confirmed by Marla) 

Tuesday, August 10, 2021: Mass 60 observed, it might be (SiO2)+ coming from the coil jacket. The parameter scan shows that the ion current is only dependent on voltage. 

Wednesday, August 11, 2021. Mass scan, and parameter scan. For the first time I am measuring only FC0 with and without gas. I'm gonna investigate the higher peaks individually, likely they are H2O,O2,O,H2, and Ar

Thursday, August 12, 2021: All day measuring different ion currents with and without gas (H2,N,O,OH,H2O,N2/CO,O2).

Friday, August 13, 2021, 09:03: Currently measuring FCO with gas. 

 Friday, August 13, 2021, 10:42: On-site. Grid is fine

Friday, August 13, 2021, 19:50:Scans completed for different species, results seem consistent but required more in-depth. FC0 scans shows higher values towards high anode voltage and high coil current but not all species shows this behavior.

Friday, August 13, 2021, 19:51: Ramping tbht to 330 @ 1 A/min. 

Friday, August 13, 2021, 20:29L IG1@8.25e-7T. 

Saturday, August 14, 2021, 22:28: Parameter scans, mass scans. Some emittance scans unsuccessful.

Anode leakage current seems to creep a bit overnight. This could be an indication of a failure onset but I'll have to see. I won't increase the current remotely until being on-site

Sunday, August 15, 2021, 10:10: Anode leakage current has increased 10 mA overnight. 

Sunday, August 15, 2021, 20:43: Emittance scans for multiple anode/coil combinations. Visually there are differences on the geometrical emittance, not so much on the 90% intensity emittance. Requires proper  emittance  analysis.

Monday, August 16, 2021, 18:58: Data analysis and short summary. Systematic emittance measurements.

Request to add more PVs to control emittance and mass scans from jupyter notebook 

Tuesday, August 17, 2021, 10:22: On site. Grid is fine. Re-initianing epics as my pc reboot it.

Tuesday, August 17, 2021, 10:23: TBHT to 335A @ 1A/min. Anode leakage current =150 mA. IG1=6.51e-7T. Increase anode current limit to 250 mA.

Tuesday, August 17, 2021, 10:29: The grid is as bright as the cathode. This is the first time the grid shines this bright. 

Tuesday, August 17, 2021, 10:53: The grid looks normal at anode=200V. By making an anode sweep I was able to observe that at around 300 V there is an onset on how bright the anode get. Passing this voltage the grid start to shine and gets a maximum brightness when reaching 500V.

This seems to suggest that the power deposited on the grid is enough to cause substantial heating if it makes it as bright as the cathode. The maximum power into the anode body (at this cathode heating current (335A))  is 500V* 200mA=100W (just like a lightbulb)

Tuesday, August 17, 2021, 12:03: Done on-site. Will continue remotely. 

Tuesday, August 17, 2021, 20:19: Anode is drawing more current. During Ar+ scan, the maximum anode current registered was ~200 mA. Now is ~250 mA 

Schottky plot shows a tiny upwards kick.

Tuesday, August 17, 2021, 22:16: Once again, at the end of the scan the current increased. This time to 320 mA

Tuesday, August 17, 2021, 22:18: I think the grid will melt tonight  with anode/coil @ 200V/30A. 

Wednesday, August 18, 2021: Well, well, well. Grid didn't melt but the  anode leakage current has increased again. At some point the anode got current limited to 350 mA and from 490 V it drop to 470V.

Wednesday, August 18, 2021, 16:57: Increasing the anode limit current to 400 A.

Wednesday, August 18, 2021, 18:01: During the scan on FC0, the anode current went up to 400 mA so I increased to 500 mA, but I had to increase to 600 mA but it was still getting current limited. Scan aborted

Maybe now I am melting the grid 

I will run an FC0 scan with gas on while I'll go on-site to check the grid and the "anomalous" ionization..

Running a mass scan while I go on-site. Anode=200. Coil=90 A.

Wednesday, August 18, 2021, 19:42: Grid is melted. From the look of it half of the visible part collapsed into a blob while the other is gone (allowing to see the far backside of the target oven.

With this knowledge I can proceed with more aggressive tests in order to test the limit if the "anomalous" regime.

Wednesday, August 18, 2021, 23:24: After a mass scan with 0 V to check surfaces ionizes species I noticed there is a signal on mass ~ 137.5 which I am not sure what it is.

It might be Ba or a molecule but is coming from the transfer line as sweeping the voltage between 0 and 2 V changes the response but above this the signal is gone and reappears with 80 V.

Thursday, August 19, 2021, 08:08: mass ~137.5 disappeared. If I increased the anode voltage to 400 V or so some appears but quickly drops.

 Thursday, August 19, 2021, 11:35: Increased anode current limit to 800 mA.

Thursday, August 19, 2021, 14:08: Scan didn't cause an increased on leakage current. Maximum registered was around 200 mA. However, the contour plot looks different to the case when the grid was complete.

Thursday, August 19, 2021, 23:36: Finishing some scans at the current settings.

Thursday, August 19, 2021, 23:36: TBHT to 280A @ -1A/min. Tomorrow I will focused on temperature scans without caring much on emittance o mass composition. 

Friday, August 20, 2021, 11:28: Scans done for,280,285. Currently running 290 A.

The coil current dependence qualitatively follows the one from ISOLDE, in which a series of minimum and maxima occur and also vary a bit with voltage.

Friday, August 20, 2021, 13:34: Accidentally set TBHT to 226 A directly from 295 A. 

Friday, August 20, 2021, 13:36: Heating TBHT to 300 A @ 4A/min. 

Friday, August 20, 2021, 14:13: TBHT is at 295 A to check things are still the same. 

Friday, August 20, 2021, 23:46: TBHT @ 310 A. 

Saturday, August 21, 2021, 06:20: Scan on-going for TBHT 315 A. 

Saturday, August 21, 2021, 13:25: TBHT to 335 A. 

Saturday, August 21, 2021, 15:02: TBHT to 340 A. 

Saturday, August 21, 2021, 18:11: The voltage got current limited during the scan for 345 A. When setting the voltage to 0V, the anode seems to be shorted. 

Saturday, August 21, 2021, 22:46: Ramping down TGHT/TBHT to 0 (@-1A/min) but the short is still present. Currently  @ TGHT/TBHT 454/162 A. 

Sunday, August 22, 2021, 13:29: This morning the heaters reach 0 A but the anode remain current limited. I will proceed to turn off the TS to check tomorrow morning the ion source. 

Sunday, August 22, 2021, 13:31: IV4 closed.

 Sunday, August 22, 2021, 13:36: Sources off.

Sunday, August 22, 2021, 13:38: IG1 off

 Sunday, August 22, 2021, 13:38: Turbos off.

Monday, August 23, 2021, 07:19: Venting 

Monday, August 23, 2021, 08:30: Confirmed a short between target/cathode to anode/heatshield

Monday, August 23, 2021, 11:29: Confirmed that the anode power supply still works :) 

After not being able to get beam through the emittance meter. I diagnosed that the plates was not biased (reason yet unknow).

I swapped the cables from the plates such that it looks like the picture below. With this, I was able to take an emittance scan with the previous parameters.

Varying the optics affect the shape and position of the emittance so I believe this is a real signal.

Keeping this configuration until I finish my measurement.

Problem: Some devices turn off unexpectedly and sometimes without any obvious trigger. In the past, the only time this was an issue was during mass scans. Now with the automation of measurements, this is a major problem as it prevents longer parameter scans.

Thursday, August 05, 2021, 08:00: Kevin setup the CANBUS snooper by hooking it up on the magnet card loop port.

This device tracks the network so if any error happen it will be captured.

Thursday, August 05, 2021, 09:39: Test unsuccessful. No device turned off (I should be happy XD)

Thursday, August 05, 2021, 09:40: Will run the test another time

A PC was setup near the old magnet power supply (20210806_150334.jpg ). One of the software run smoothly but the other more useful one fails to connect to the usb adapter.

 Friday, August 06, 2021, 14:52: Fixed issue with  the usb adapter. With this, the CANBUS traffic can be store and inspected to catch any error on the communication (Annotation_2021-08-06_144737.png).

Friday, August 06, 2021, 14:53: Loggers are running. 

 Friday, August 13, 2021, 11:07: I forgot to input the feedback  from Kevin:

"33 errors out of 10,300,00 transaction seems statistically insignificant to me. "

From the devices tripped,

"Most of the tripped supplies are located on the front side of the rack, the original test stand controllers"

So maybe the issues could be

"Compatibility issues with the old and new? The newer supplies are all daisy chained, should we upgrade these to the tap boards?

Should the old controllers (original test stand appear to be MK supplies) be upgraded (do we have enough)?"

Saturday, August 07, 2021, 18:02: As mentions in previous entries, the FC0 current oscillates with no change on ion source parameters.

Hence, I came on-site to see if there was an issue with the hardware. Nothing obvious.

Last night there were some sparks that might have cause some issue.

RPMS are shifted toward negative current reading, similar to what we observed when testing TM4 sourcetray.

To rule out hardware issues I swapped the signals from FC0 to FC6 and visceversa.

When the output of FC0 goes to the FC6 controller the readout makes sense, and this behaves as expected with gas on/off.

When the output of FC6 goes to the FC0 controller there is no readout coming out. This suggest, at least to me, that some damage or error is happening on the DAQ side.

I will reboot the ioc expecting to see something.

Things sort kind of Ok but I don't trust it. FC0 reading makes a bit more sense. RPMS remains with an offset

Saturday, August 07, 2021, 20:31: The FC0 reading increase from 7.54e-11 A to 1.64e-8 A starting at 19:32. Also, the RPMS baseleves are not offset anymore, the -10 rd when using the 1 nA scale is back to 0 (normal)

 Monday, August 23, 2021, 09:53: RP1 was swapped back to our original pump. (see e-log 889)

Derek informed that they test it overnight and performed well, and it's a bit slow but it goes down to 20 mT.

Current is at 36 mTorr and dropping.