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 |