Friday. July 26th 2019 

A new electrical configuration of the test stand was decided and installed. The TGHT and TBHT were parallelized in order to deliver up to 600 + 600 Amperes to the p2n target.

Connections:

TGHT+: D

TGHT-: C

TBHT+: one cable to E and one cable to G (both going down to the coil terminal blocks, which are connected to the target terminal blocks through a copper short.

TBHT-: both cables to F. One 4/0 cable was run from F to H to achieve the same configuration as for TBHT+. The H terminal is connected to I (HV ground, conencted to the target copper heat shield) through a braided cable

One braided cable was connected from C to H so the target line should have the same potential as the TBHT/coil lines.

Saturday, July 27th

The current was ramped from the TBHT and TGHT in parallel up to 400+400=800A.

Sunday, July 28th

One leg of the target is glowing a bit, while the other doesn't. This suggests the current path is not straightforward as we planned.

Temperature measurements of the cables on top of the test stand were performed using a mini IR thermometer (FLUKE, borrowed from Arthur).

Temperature of the braided cable from C to H = ~50 °C --> This points to an imbalance of current between the two lines (TGHT and COIL lines). This might be alright.

Temperature of the braided cable from H to I = ~130 °C. This likely points to a short circuit between the target and the copper heat shield.

Monday, July 29th

In order to understand if the target is broken or touching the heat shield, we opened up the service cap.

- The braided cable from H to I was removed

- The braided cable from H to Q was disconnected

These two modifications were made so that the current cannot come back from the heat shield, but has to go through the target lines.

The 4/0 cables from the PS to the feedthroughs were removed so that we could confirm there is a short between C (target) and I(HV ground/heat shield). The 4/0 were than put back on the feedthrough connections.

Under advice of Dan Louie and Arthur, we did not change any configuration of the power supplies. We know that the current would go through the controls loop, but the impedance of this electronics should be high enough to sustain the current load.

At 3pm, the ramping was still increasing the current on the target, but one leg (the right one) was still glowing. By this time, the total current in the target assembly is ~500 amperes, so there should be no signs of any glowing happening. Probably there's something wrong with the target itself. We're opening up to check the status of the target.

Tuesday, July 30, 2019, 10:00: Venting. 

Tuesday, July 30, 2019, 10:03: Purging heat shield water loop. 

Tuesday, July 30, 2019, 11:46: P2N removed

After submitting a fault report (FR - ISAC Fault 12461) a Work Permit was issued (WP - C2019-07-19-1),

Controls tunnel the faulty signal to another ADC by removing signal no longer used at the Test Stand.

Test successful with a constant current power supply in the range 1 nA-40 nA.

TBD: does this work with beam?

Tuesday, July 16, 2019, 10:27: The idea of this run is to have the full 600 A from TGHT and the full 600 A from TBHT.

This will done based on the rewiring done previously (see entry 745)

Tuesday, July 16, 2019, 12:16: Jumper cable F-H burning while target was at 600 A total. Ramp up aborted and auto-cooling started to remove the jumper.

Jumper removed.

TBHT cables on both positive coil FT.

Jumper E-G removed.

High current cable connecting F-H.

Tuesday, July 16, 2019, 16:49

Current ramped up to 300A + 300A on TGHT and TBHT in parallel, for an equivalent of 600A on the target. No burn to anything noticed, PS ramping nicely together. Stopped ramping up and started ramp down for the night.

Monday, July 15, 2019, 15:54 : TBHT high current cables moved to Coil feedthroughs.

Coil high current cables moved to TBHT feedthroughs.

Resistor across  Coil feedthroughs E and F are now moved between TBHT feedthroughs A and B.

Tuesday, July 16, 2019, 09:00

A braided cable between F and H was changed due to the burnt aspect it had. Most likely this cable was burnt along the previous ones (see entry 740) but since it was uniformed blacked and not broken I didn't noticed it.

Resistor/Varistor between TGHT and TBHT removed.

(see entry 742)

p2n target heated over the weekend after the connections between the bottom target legs and the copper connector has been modified from rivets to M3 screws. Target hold current nicely with no major voltage spikes.

The plan now is to cycle the current heating few times to "stress test" the target.

Thursday, July 04, 2019, 15:00: TBHT insulator was swapped out on the source tray side. 

The old one is very chipped.

Screws instead of rivets on target leg. Insulator changed.

Thursday, July 04, 2019, 15:14: Roughing

Thursday, July 04, 2019, 16:00: Turbos on.

Thursday, July 04, 2019, 16:12: IG1 on. RGA on

Friday, July 05, 2019, 08:12: Waterlines opened. No response on RGA. Vacuum ok @ 4.57e-06T.

Friday, July 05, 2019, 08:14: Power / sources on.

LE,FM

Friday, July 05, 2019, 10:00: Autoramping TGHT/TBHT to 250/100 A @ 3 A/min. Vacuum limits change to 5e-6 T and 5.5e-6 T. Vacuum ok @ 4.2e-6 T.

Friday, July 05, 2019, 11:42 :

Friday, July 05, 2019, 11:45 : Auto ramping TGHT/TBHT to 300/150A @ 3 A/min.

Friday, July 05, 2019, 17:32:

Friday, July 05, 2019, 13:56: Source/Optics on

Friday, July 05, 2019, 14:38: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. One spark while bring the BIAS to 30 kv around 27.5 kV. IV4 opened.

Friday, July 05, 2019, 17:32: BIAS / EE / EZL @ 0 for the weekend. Heater will be left on.

FM

Monday, July 08, 2019, 15:12:  BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Monday, July 08, 2019, 18:59: BIAS / EE / EZL @ 0.00 kV

Tuesday, July 09, 2019, 13:42: TBHT/TGHT @ 590/230A.

Tuesday, July 09, 2019, 13:49 BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Tuesday, July 09, 2019, 14:04: Dipole magnet not responding. Cycling the PS on EPICS didn't work. Cycling the PS directly worked.

Tuesday, July 09, 2019, 17:28: BIAS / EE / EZL @ 0.00 kV

 Tuesday, July 02, 2019, 18:24: A blind is installed  on the FEBIAD gas line (see attached picture)  to rule out the possibility of  gases entering the TIS.

See elog 737 

Thursday, June 27, 2019, 09:45: The cables showing burnt marks were changed with new ones on Wednesday 26th. The grounding cables were insulated with yellow heatshrink. The anode wire connection was redone.

The wiring on the top of the test stand was burned, see entry 737.

Probable cause of this is as follows:

Coil lines are connected by a wire to HV common, the 9-pin feedthrough etc to maintain same voltage on all the insulator tops. This is also directly connected to the extraction electrode spark gap. When this sparks, it momentarily changes the potential in that line (normally HV common) which then can make this path the best route for current from the coil to return to ground.

See attached diagram.

Best solution to this problem is to disconnect the high current section from the low current section, and attach each separately to HV common.

Other possible improvements to wiring:

1. Remove jumpers between positive coil lines (and neg. coil lines) since these feethroughs are physically connected by the copper pipe.

2. Add a resistor to the jumper between coil - and TBHT - since this will eliminate all possibility of current flowing between the two.

3. Add a resistor in line where the high current section is connected to HV common to avoid possibility of current going through jumpers.

The HP-SIS uses the older center block. No serial number found. 

Loaded with Tantalum. Rough Target description:

Comment on the bag - 0.9 cm space

Total Ta foils = 525

Foil Thickness = 0.025mm (assumed)

Target density =  ?

Target length = 7.3 cm

Total Mass =  ?

Total mass w/ Target oven=  1242 g.

Assembly voltage checks - OK. Note* Spacers between insulator & Target.

Thermocouple wires attach to the 9-pin connector.

 Wednesday, June 26, 2019, 14:47: roughing.

Wednesday, June 26, 2019, 15:30: Turbos on.

Wednesday, June 26, 2019, 15:51: IG1 on. Vacuum @ 1.14e-4 T.

Thursday, June 27, 2019, 07:11: Waterlines opened. No response on RGA. Vacuum stable @ 3.49e-06T.

Thursday, June 27, 2019, 07:14: Power / sources switched on. Omega switched on to read thermocouples.

Thermocouple readings:

T1 - 24.8 C & T2 - 24.9 C.

Thursday, June 27, 2019, 07:16:

Thursday, June 27, 2019, 12:43: Auto-ramping TGHT / TBHT to 350 / 125 A @ 2 A per min

Friday, June 28, 2019, 07:02: HV on, IV4 opened.

Friday, June 28, 2019, 07:09: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Friday, June 28, 2019, 07:10: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min.

Friday, June 28, 2019, 07:12: Spark*

Friday, June 28, 2019, 07:15: Optics on. Some instability noticed on the BIAS.

Friday, June 28, 2019, 07:17:

Thermocouple readings:

T1 - 106.7 C & T2 - 106.8 C.

Friday, June 28, 2019, 07:24: Halt auto ramping. TGHT / TBHT @ 375 / 150 A. BIAS / EE / EZL @ 0 kV. Unusual amount of sparks and instability. 

Friday, June 28, 2019, 08:45: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. Sparks seen immediately.

The TBHT insulator on the source tray side is glowing blue. Very neat.

Sparks observed striking inside the vacuum on the thermocouples / heat shield from the TBHT.

Friday, June 28, 2019, 08:57: BIAS / EE / EZL @ 0 kV. Auto-cooling @ 4 A per  min.

Friday, June 28, 2019, 10:45: Disconnect mini pump, connect OMEGA thermometer to ground.

Friday, June 28, 2019, 10:59: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. No sparks.

Friday, June 28, 2019, 11:03: manually bump up TGHT / TBHT to 50 A.

Friday, June 28, 2019, 11:05: Auto-ramping TGHT / TBHT to 250 / 150 A @ 4 A per min.

Friday, June 28, 2019, 11:39: Spark*

Friday, June 28, 2019, 11:57: Auto-ramping TGHT / TBHT to 500 / 200 A @ 4 A per min.

Friday, June 28, 2019, 12:15: TGHT / TBHT @ 322 / 200 A. Sparking*

Friday, June 28, 2019, 12:17: Halt auto-ramping. Sparking*. Manually bring down current.

Friday, June 28, 2019, 12:23: Sparks ceased. TGHT / TBHT @ 300 / 150 A

Friday, June 28, 2019, 12:24: BIAS / EE / EZL @ 0 kV. Auto-cooling @ 4 A per  min.

Friday, June 28, 2019, 12:32: new video taken. After reviewing the video, the spark originates at the heat shield / thermocouples and moves to the TBHT insulator.

Friday, June 28, 2019, 15:26: Auto-ramping TGHT / TBHT to 200/ 100A @ 4 A per min.

Tuesday, July 02, 2019, 07:58: RGA restarted.

Tuesday, July 02, 2019, 08:07: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. No sparks. Vacuum @ 7.08e-07T.

Tuesday, July 02, 2019, 08:08: Auto-ramping TGHT / TBHT to 350 / 150 A @ 4 A per min.

Tuesday, July 02, 2019, 08:37: Halt auto ramp. TGHT / TBHT @ 310 / 150 A. Two sparks*. Vacuum @ 2.32e-06T. Allow to stabilize.

Tuesday, July 02, 2019, 08:55: Auto-ramping TGHT to 350 A @ 4 A per min. Vacuum @ 1.08e-06T.

Tuesday, July 02, 2019, 09:05: TGHT @ 350 A. Vacuum @ 1.08e-06T

Tuesday, July 02, 2019, 09:07: Spark*

Tuesday, July 02, 2019, 09:16: Spark*

Tuesday, July 02, 2019, 09:24: Spark*

Tuesday, July 02, 2019, 09:38: Auto-cooling @ 4 A per  min.

Tuesday, July 02, 2019, 09:45: BIAS / EE / EZL @ 0 kV.

Tuesday, July 02, 2019, 11:39: IG1 off. Turbos off. RGA off

Tuesday, June 25, 2019, 16:15: While inspecting the 9-pin connection with Ferran, it was noticed how two braided cables were burnt out pretty bad to the point they were separated in half (see attached pictures).  Additionally the plastic insulator for the anode wire was melted.

Tuesday, June 25, 2019, 16:30: Braided cables need to be changed and anode wire redone. 

Tuesday, June 25, 2019, 17:16: Wondering if this happened during TM4 source tray conditioning given the following entries in the elog (entry 725):

Monday, June 03, 2019, 09:51: BIAS down to 50 kV. Burnt plastic smell lingering. Wait* 

Tuesday, June 04, 2019, 10:29: Note* Minute fluctuations of Anode current have ended after the spark. Also slight 'Burnt' smell noticed around the test stand area.

Monday, June 24, 2019, 15:25: Current quadrupole polarities:

Monday, June 24, 2019, 15:35 : The polarity on TMS:Q3 is reversed. The top and bottom poles should be at a positive voltage similar to TMS:Q4, however a negative tagged cable is connected to it.

Monday, June 24, 2019, 15:39 : Swapping the cables on TMS:Q3.

I opened the test stand because I forgot to install tantalum heat shields around the target. Everything was reinstalled as before (with heat shields). I could turn on the TSGTP1B but TSGTP1A does not turn on for some reason. I tried multiple times opening/closing its valve (BV1A) but the pump never starts.

Will keep pumping over the weekend with TP1B only.

Friday, June 21, 2019, 14:48: Roughing.

Friday, June 21, 2019, 15:18: Turbo pumps on.

Friday, June 21, 2019, 15:31: IG1 on.

Friday, June 21, 2019, 15:42: Vacuum@9.31e-5 T

Friday, June 21, 2019, 15:51: RGA switched on.

Friday, June 21, 2019, 16:30: Luca wants to put heat shields on his target. Aborting pumping. 

Friday, June 21, 2019, 16:57: IG1 off 

Friday, June 21, 2019, 16:57:  Turbo pumps off.

 Friday, June 21, 2019, 16:57: RGA switched off

AS

Monday, June 24, 2019, 07:18: Restart TP1A (Timeout) Global Reset. Restart again.

Monday, June 24, 2019, 07:29: TP1A to speed. Monitor. Vacuum @ 4.31e-06T

Monday, June 24, 2019, 07:31: Restart RGA.

Monday, June 24, 2019, 08:57: Waterlines opened. No response on RGA. Vacuum @ 3.23e-06T.

Monday, June 24, 2019, 09:03: Power / sources on. (No HV)

Monday, June 24, 2019, 09:04: TGHT / TBHT / Coil PS ready.  Vacuum @ 3.23e-06T.

Monday, June 24, 2019, 10:09: Auto-ramping TGHT / TBHT to 150 / 75 A @ 2 A per min. 

Monday, June 24, 2019, 10:57: Auto-ramping was halted @ 35 A. Coil increased. TGHT, TBHT, Coil brought back to 0 A

Monday, June 24, 2019, 10:58:

 Monday, June 24, 2019, 11:01: Auto-ramping TGHT / TBHT to 150 / 75 A @ 2 A per min. Manually ramp coil to 150 A @ approx the same rate.

Monday, June 24, 2019, 12:20: Halt at 140A TGHT / Coil. Vacuum limit?

Monday, June 24, 2019, 13:23: Increasing good vac limit. From 3e-6 to 4.5e-6 T

Monday, June 24, 2019, 13:29: Auto-ramping TGHT / TBHT to 300 / 120 A @ 2 A per min. Manually ramp coil from 140 to 150 A @ approx the same rate.

Monday, June 24, 2019, 13:37

 Monday, June 24, 2019, 14:4: TGHT @ 270 A. Vacuum limits reached 3.05e-06T. Gradual out-gassing w/ cont'd auto ramp.

Tuesday, June 25, 2019, 07:53: Auto-ramping TGHT / TBHT to 550 / 120 A @ 2 A per min.

Tuesday, June 25, 2019, 08:34:

Tuesday, June 25, 2019, 10:09: At approx 9:45am a vacuum spike tripped the test stand. All heaters at 0 A. Power supplies checked.

Tuesday, June 25, 2019, 10:11: TGHT / TBHT / Coil @ 6 A. Bumped up manually.

Tuesday, June 25, 2019, 10:12: Auto-ramping TGHT / TBHT to 300 / 100 A @ 2 A per min. Manually ramp coil to 150 A.

Tuesday, June 25, 2019, 11:01: One sheet on the target leg is shining red.

Tuesday, June 25, 2019, 11:01: Aborting the ramping.

Tuesday, June 25, 2019, 11:08 :

Tuesday, June 25, 2019, 11:18: Continue auto ramping

Tuesday, June 25, 2019, 11:37: Auto-cooling @ 12 A per min. Coil tapped down manually.

Tuesday, June 25, 2019, 11:58: Sources off. RGA off. Power off.

Tuesday, June 25, 2019, 11:59: IG1 off. Turbos off.

Wednesday, June 19, 2019, 17:13  Ferran and Fernando tested the 9-pin connector to have a reading on a thermocouple following the connections used by Aurelia (see elog 721).

Wednesday, June 19, 2019, 17:24: Test succesful!

Thursday, June 13, 2019, 14:04: Spare TGHT PS installed /  tested. The old one is to be sent out for repair.

Tuesday, June 11, 2019, 14:33: Roughing.

Wednesday, June 12, 2019, 08:18: Venting to install FEBIAD.

Wednesday, June 12, 2019, 09:13: LP-FEBIAD installed. Roughing.

Wednesday, June 12, 2019, 11:13: Turbo pumps on.

Wednesday, June 12, 2019, 11:21: Ion gauge on. 

Wednesday, June 12, 2019, 11:48: RGA re-connected & switched on.

Thursday, June 13, 2019, 10:27:

He Leak TEST:

Vacuum Group Leak detector LD#4.

Thursday, June 13, 2019, 10:28: Vacuum @ 1.60e-06T

LD Base line before opening valve to turbo pumps: 0.0e-09 atm-cc/sec

Thursday, June 13, 2019, 10:35: LD baseline after opening valve to turbo pumps: 1.2e-09 atm-cc/sec

Full open base:

Vacuum @ 1.60e-06T. RGA status:

Water: 2.20e-006

He: 4.55e-010

LD:  1.2e-09 atm-cc/sec

Thursday, June 13, 2019, 10:35:

Open line FS#2 . Pressurize to 30 PSI. Record after 5 minutes

Thursday, June 13, 2019, 10:40 Vacuum @ 1.54e-06T . RGA status:

Water: 2.20e-006

He: 4.20e-010

LD: 0.1e-09 atm-cc/sec. Purge and close FS#2.

Thursday, June 13, 2019, 10:45: Open line FS#3 . Pressurize to 30 PSI. Record after 5 minutes

Thursday, June 13, 2019, 10:50: Vacuum @ 1.52e-06T. RGA status:

Water: 2.18e-006

He: 3.68e-010

LD: 0.7e-09 atm-cc/sec. Purge and close FS#3.

Thursday, June 13, 2019, 10:50: Open line FS#4 . Pressurize to 30 PSI. Record after 5 minutes

Thursday, June 13, 2019, 10:55: Vacuum @ 1.54e-06T. RGA status:

Water: 2.16e-006

He: 9.24e-011

*LD: 3.7e-09 atm-cc/sec. Run for another 5 minutes.

Thursday, June 13, 2019, 11:00: Vacuum @ 1.52e-06T. RGA status:

Water: 2.15e-006

He: 2.06e-010

*LD: 0.7e-08 atm-cc/sec. Potential He escaping through o-rings*

Purge and close FS#4.

Thursday, June 13, 2019, 11:01: Open line FS#5 . Pressurize to 30 PSI. Record after 5 minutes

Thursday, June 13, 2019, 11:06: Vacuum @ 1.52e-06T. RGA status:

Water: 2.13e-006

He: 2.75e-010

LD: 1.7e-08 atm-cc/sec. Purge and close FS#5

Thursday, June 13, 2019, 11:07: Depressurize lines. Connect HPA & Purge all lines. 

Thursday, June 13, 2019, 11:12: Vacuum @ 1.54e-06T . RGA status:

Water: 2.12e-006

He: 6.21e-010

LD: 3.3e-08 atm-cc/sec

Close Valve & disconnect LD. HE LEAK TEST COMPLETE

Thursday, June 13, 2019, 11:20: Vacuum @1.52e-06T :Begin gradually opening the waterlines.

Thursday, June 13, 2019, 11:22: Open FS#2. Vacuum @ 1.52e-06T. No Response on RGA.

Thursday, June 13, 2019, 11:23: Open FS#3. Vacuum @ 1.52e-06T. No Response on RGA.

Thursday, June 13, 2019, 11:23: Open FS#4. Vacuum @ 1.52e-06T. No Response on RGA.

Thursday, June 13, 2019, 11:24: Open FS#5. Vacuum @ 1.52e-06T. No Response on RGA.

Thursday, June 13, 2019, 11:28: Power sources: Tested. TGHT PS is still a no go. Power switched off, lock out.

Thursday, June 13, 2019, 14:03: New TGHT PS installed.

Thursday, June 13, 2019, 14:06: Power / sources on.

Thursday, June 13, 2019, 14:20: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. EZL current @ 61 uA. EZL appears to be fixed. :)

Thursday, June 13, 2019, 14:21: Spark*

Thursday, June 13, 2019, 14:29: Sources to 0 kV. FS#8 needs re-connection.

Thursday, June 13, 2019, 14:43: FS#8 connected. Vacuum ok @ 1.52e-06T. No response on RGA.

Thursday, June 13, 2019, 14:45: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 A per min.

Friday, June 14, 2019, 06:52: Restart RGA.

Friday, June 14, 2019, 08:37: Run mini pump to prep gas-lines.

Friday, June 14, 2019, 08:44: Close SV1, manual valve & turn off mini pump. Gradually open gas lines.

Friday, June 14, 2019, 08:48: Gas lines fully opened.

Friday, June 14, 2019, 08:49: Auto-ramping TGHT / TBHT to 570 / 270 A @ 2 A per min.

Friday, June 14, 2019, 08:52: HV sources ready.

FM

Friday, June 14, 2019, 11:11: Anode current @ 0V 7.326mA. Setting Anode to 150 V.

AS

Friday, June 14, 2019, 11:16: Auto-ramping TGHT / TBHT to 580 / 290 A @ 2 A per min.

Friday, June 14, 2019, 11:18: Optics set.

Friday, June 14, 2019, 11:29: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. One spark while bring the BIAS to 30 kv around 27.5 kV. IV4 opened.

Friday, June 14, 2019, 14:39: Multiple wire scans attempted since 1pm. Controls & Diagnostics contacted. Ongoing troubleshooting.

Monday, June 17, 2019, 08:34: TMS:MB1 - Reset. 

Monday, June 17, 2019, 09:18: Auto-ramping TBHT to 310 A @ 2 A per min.

FM

Monday, June 17, 2019, 10:30: TBHT manually tapped to 320 A  ~2A/min

Tuesday, June 18, 2019, 18:42 : BIAS / EZL / EE @ 0 kV. Anode @ 0 V.

Tuesday, June 18, 2019, 18:43: Begin auto-cooling @ 2A per min.

AS

Wednesday, June 19, 2019, 07:10: IV4 Closed.

Wednesday, June 19, 2019, 07:12: Gas lines & Sources / power off.

Wednesday, June 19, 2019, 07:15: RGA off.

Wednesday, June 19, 2019, 07:16: IG1 & Turbo pumps off.

Wednesday, June 19, 2019, 08:35: Purging / venting.

Monday, June 10, 2019, 13:00: Optics Tray removed.

Megger'd @ 1000V on EZL and Collimator. Passed. Open it.

Monday, June 10, 2019, 14:34: 3 cracked insulators found. 1 quite broken on the threads (see attached pictures). Replaced insulators & re-assembled optics tray.

Megger'd @ 1000V on EZL and Collimator. Passed.

Thursday, June 13, 2019, 14:23: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. EZL current @ 61 uA. EZL appears to be fixed. :)

Monday, June 10, 2019, 09:30: TM4 Source Tray removed - To HC area.