Restarted TP. Note that CG1A is above 50 mTorr. CG1B shows 15 mTorr

Wednesday, October 23, 2019, 09:50:

Fault: 12797
WP: C2019-10-23-2

ISAC test stand power supply MB-1 leak.

Water can be seen underneath and behind power supply cabinet. Repairs as per WP.

Friday, October 25, 2019: Power supply operational. AM

Friday, October 18, 2019, 14:58: Roughing.

Friday, October 18, 2019, 15:30: Turbo pumps on.

Friday, October 18, 2019, 15:35: Ion gauge on.

Friday, October 18, 2019, 15:39: RGA on.

Tuesday, October 22, 2019, 08:37: Restart RGA.

Tuesday, October 22, 2019, 08:39: Waterlines opened. No response on RGA. Vacuum stable @ 4.76e-07T.

Wednesday, October 23, 2019, 09:15: Calibrated He leak bottle installed on line labeled as "Neon"

Wednesday, October 23, 2019, 09:45: Do not start TS. Magnet PS water leak issue.Fault: 12797

FM

Monday, October 28, 2019, 09:10: Magnet leak repaired on Friday.  Checked by Anders. The polarity might need to be reversed.

Monday, October 28, 2019, 09:20: Vacuum gauges checked and reconnected ( see elog 765)

Monday, October 28, 2019, 09:28: RGA restarted.

FM

Tuesday, October 29, 2019, 9:00: Power/Sources on.

Tuesday, October 29, 2019, 10:29 :

Tuesday, October 29, 2019, 10:29: Gas lines opened

Tuesday, October 29, 2019, 10:45: BIAS/EZL/EE to 30 / 13 / 1.5 kV.

Tuesday, October 29, 2019, 10:56: Vacuum stable @ 7.28e-07T.

Tuesday, October 29, 2019, 10:54 : Auto-ramping TGHT / TBHT to 580 / 290 A @ 2A per min.

Tuesday, October 29, 2019, 11:01: IV4 open.

Tuesday, October 29, 2019, 11:01: Optics set to "old nominal" tunes.

Rick has provided new tunes that have been tested recently and show better beam quality. If times allows it I'll checked them again for this source

Tuesday, October 29, 2019, 14:02: Spark. Left monitor flickered.

Tuesday, October 29, 2019, 17:45: Mass scan @200V only showing surface ionized items. Either the anode is disconnected or the electron current is particularly low.

Wednesday, October 30, 2019, 09:10: TBHT tapped up to 310 A. No response on the anode leakage current,

Wednesday, October 30, 2019, 09:17 After talking with Anders, the system will be ramped down and switched to cathode bias.

Wednesday, October 30, 2019, 09:21: Auto-cooling to TGHT / TBHT to 0/ 0 @ 6A per min.

Wednesday, October 30, 2019, 11:04: : BIAS/EZL/EE to 0V

Wednesday, October 30, 2019, 14:50 Now on Cathode bias mode. See elog 766   

Wednesday, October 30, 2019, 14:53: Power/ Sources on.

Wednesday, October 30, 2019, 15:02: Gas lines open

Wednesday, October 30, 2019, 15:04: Optics set

Wednesday, October 30, 2019, 15:30: BIAS/EZL/EE to 30 / 13 / 1.5 kV.

Anode@200V. Coil@40A

Wednesday, October 30, 2019, 15:30: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2A per min.

 Wednesday, October 30, 2019, 15:59: Auto-ramping aborted.

Wednesday, October 30, 2019, 16:00: Auto-ramping TGHT / TBHT to 300 / 150 A @ 4A per min.

FM

Thursday, October 31, 2019, 08:05: Auto-ramping TGHT / TBHT to 580/ 290A @ 4A per min.

Thursday, October 31, 2019, 08:54: TBHT at  set current and glowing but no leakage current on the anode.

Thursday, October 31, 2019, 08:56: Ramping aborted.

Thursday, October 31, 2019, 09:19: Manually tapping TBHT to 300 A. Still no leakage current.

Thursday, October 31, 2019, 09:08: Auto-cooling to TGHT / TBHT to 0/ 0 @ 8A per min.

Thursday, October 31, 2019, 09:35: BIAS/EZL/EE to 0V

Thursday, October 31, 2019, 10:16: Gas lines closed.

Thursday, October 31, 2019, 10:16: IV4 closed.

Thursday, October 31, 2019, 10:16: IG1 off.

Thursday, October 31, 2019, 10:17: RGA off.

Thursday, October 31, 2019, 10:17: Turbos off.

Thursday, October 31, 2019, 11:41 Venting

 Thursday, October 31, 2019, 11:41: HS waterline purged.

Thursday, October 31, 2019, 13:00: Inspecting the interior, 9 pin connector slightly de attached but now reattached (see elog 768)

Thursday, October 31, 2019, 13:07: Roughing

Thursday, October 31, 2019, 13:40: Turbos on

Thursday, October 31, 2019, 13:44: Gas lines open

Thursday, October 31, 2019, 13:47: IG1 on

Thursday, October 31, 2019, 13:48 RGA on.

Thursday, October 31, 2019, 16:09: Waterlines opened. No response on RGA. Vacuum stable @ 2.41e-06T.

Thursday, October 31, 2019, 16:15: Power/ sources on.

Thursday, October 31, 2019, 16:15  BIAS/EZL/EE to 30 / 13 / 1.5 kV.

Thursday, October 31, 2019, 16:16: Optics set

Thursday, October 31, 2019, 16:17

Thursday, October 31, 2019, 08:05: Auto-ramping TGHT / TBHT to 580/ 290A @ 4A per min.

Thursday, October 31, 2019, 16:17: IV4 open

Thursday, October 31, 2019, 17:27: Readback current is not displayed on EPICS. However, electron impact ionized species are present in the mass scan.

Thursday, October 31, 2019, 17:29: Auto-ramping aborted. TBHT/TGHT 290/292 A. Vacuum stable@2.32-6 T

 Friday, November 01, 2019, 08:35: Auto-ramping TGHT  to 580 A @ 4A per min. TBHT @ 290 A. - AS

Friday, November 01, 2019, 12:09: Auto-cooling to TGHT / TBHT to 0/ 0 @ 8A per min.

Friday, November 01, 2019, 13:13: Anode to 0V.

Friday, November 01, 2019, 13:13: Gas lines closed

Friday, November 01, 2019, 13:25 BIAS/EZL/EE to 0V

Friday, November 01, 2019, 13:26: IV4 closed

Friday, November 01, 2019, 13:32: Power / Sources off. Ion gauge & Turbo pumps off.

Friday, November 01, 2019, 14:36: Venting.

Wednesday, October 02, 2019, 13:42: Roughing.

Wednesday, October 02, 2019, 14:13: Turbo Pumps started.

Wednesday, October 02, 2019, 14:19: Ion gauge on.

Wednesday, October 02, 2019, 14:24: RGA on.

Thursday, October 03, 2019, 07:35: Waterlines opened.  No response on RGA. Vacuum ok @ 7.53e-07T

Thursday, October 03, 2019, 07:37: Power / Sources on.

Thursday, October 03, 2019, 07:38: Auto-ramping TGHT to 580 A @ 2 A per min.

Friday, October 04, 2019, 14:53: Auto-cooling @ 2 A per min. 

Wednesday, October 16, 2019, 10:17: RGA off.

Wednesday, October 16, 2019, 10:19: Power / Sources off. IG1 off. Turbo pumps off.

Using broken LP-FEBIAD oven. TBHT off.

Friday, September 27, 2019, 11:53: Roughing.

Friday, September 27, 2019, 13:14: Turbo pumps on.

Friday, September 27, 2019, 13:20: Ion gauge on.

Friday, September 27, 2019, 13:24: RGA on.

Monday, September 30, 2019, 07:30: Waterlines Opened. No response on RGA. Vacuum ok @ 5.39e-07T.

Monday, September 30, 2019, 07:34: Power / Sources on.

Monday, September 30, 2019, 07:35: Auto-ramping TGHT to 580 A @ 2 A per min.

Tuesday, October 01, 2019, 14:29: Auto-Cooling TGHT @ 2A per min.

Wednesday, October 02, 2019, 08:24: Power / sources off.

Wednesday, October 02, 2019, 08:25: RGA off.

Wednesday, October 02, 2019, 08:26: Ion gauge & Turbo pumps off.

Wednesday, October 02, 2019, 12:50: Venting & Waterlines purged.

Thursday, September 26, 2019, 11:28: The control board to TSG:CB1 was removed and replaced. 

Thursday, September 26, 2019, 11:30: All optics & steering operational. Board replacement successful.

Monday, September 23, 2019, 13:28: Roughing.

Monday, September 23, 2019, 13:38: Closed BV1A / Opened BV1 A & B to open both @ 35.0 T.

Monday, September 23, 2019, 14:20: Turbo pumps started.

Monday, September 23, 2019, 14:27: Ion gauge on.

Tuesday, September 24, 2019, 08:04: RGA on.

Tuesday, September 24, 2019, 08:07: Waterlines opened. No response on RGA. Vacuum ok @ 1.52e-06T.

Tuesday, September 24, 2019, 08:12: Power / sources on.

Tuesday, September 24, 2019, 08:16: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2A per min.

Tuesday, September 24, 2019, 08:19: IV4 opened. Initial attempt to open IV4 unsuccessful - Timed out. Reset.

Tuesday, September 24, 2019, 08:20: IV4 Opened.

Tuesday, September 24, 2019, 08:28: BIAS / EE / EZL @ 27 / -1.5 / 13 kV. Spark*

Tuesday, September 24, 2019, 08:30: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Tuesday, September 24, 2019, 09:07: Optics set.

Tuesday, September 24, 2019, 10:45: Clusters of sparks noted. Especially around 10:20.

Tuesday, September 24, 2019, 10:58: RGA reset.

Tuesday, September 24, 2019, 11:05  Sparks ongoing. spaced from 1 minutes apart to 15 minutes apart. The TBHT insulator is glowing blue on the left right side again.

Tuesday, September 24, 2019, 11:06: Abort Target heating.

Tuesday, September 24, 2019, 11:12: BIAS to 23 KV. Blue glow less pronounced /  almost gone.

Tuesday, September 24, 2019, 11:15: BIAS to 30 KV. Blue glow remains.

Tuesday, September 24, 2019, 11:31: Continue auto-ramping @ 2A per min.

Tuesday, September 24, 2019, 11:39. HV off.

Tuesday, September 24, 2019, 11:49: Halt ramp. Auto-cooling @ 4 A per min.

Remove loose wiring / connection from 9-pin area in the back. Ground other loose connections.

Tuesday, September 24, 2019, 13:28: Auto-ramping TGHT / TBHT to 250 / 200 A @ 4A per min.

Tuesday, September 24, 2019, 13:31: HV sources on. Optics on.

Tuesday, September 24, 2019, 13:38: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Tuesday, September 24, 2019, 14:32: Auto-ramping TGHT to 280 A @ 4A per min.

Tuesday, September 24, 2019, 14:40: TGHT / TBHT @ 280 /  200 A.

EPICS issues* ? Won't open at the ISAC TS computer.

Wednesday, September 25, 2019, 07:30: Auto-ramping TGHT to 350 A @ 2 A per min. 

Wednesday, September 25, 2019, 07:44:  EPICS Error at my desk as well. Able to restart it and continue ramping.

Wednesday, September 25, 2019, 07:56: EPICS Issue ongoing. Halted ramping @ 290 A on TGHT.

Wednesday, September 25, 2019, 10:44: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2A per min. 

Wednesday, September 25, 2019, 11:57: FM: Sparks have been occurring for the past 20 min with a rate approx of 0.5/min. The TBHT insulator is again  showing a glowing blue. I managed to saw one spark flashing up the TBHT insulator.

Wednesday, September 25, 2019, 12:59: RGA restarted.

Wednesday, September 25, 2019, 13:36: Spark* knocked out TSG:CB1 during RPM6A wire scan. Controls notified.

Wednesday, September 25, 2019, 14:45: After investigation with controls, replacement of the control board to TSG:CB1 likely req'd.

Thursday, September 26, 2019, 06:30: HV off. Prep to remove control board for TSG:CB1. 

Thursday, September 26, 2019, 11:28: The control board to TSG:CB1 was removed and replaced. https://elog.triumf.ca/TIS/Test-Stand/759

Thursday, September 26, 2019, 11:30: All optics & steering operational. Board replacement successful.

Thursday, September 26, 2019, 11:36:  BIAS / EE / EZL @ 30 / -1.5 / 13 kV. 

Thursday, September 26, 2019, 12:31: Mass, wire, & emittance scans successful

Thursday, September 26, 2019, 12:33: Auto-cooling to TGHT / TBHT to 530 / 180 @ 4A per min.

Thursday, September 26, 2019, 12:45: TGHT / TBHT @ 530 / 180A. Hold*  

Thursday, September 26, 2019, 13:17: No Sparks*. Auto-cooling to TGHT / to 500 @ 4A per min.

Thursday, September 26, 2019, 13:25: No Sparks*. FC0 'in'.  

Thursday, September 26, 2019, 13:26: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2A per min. 

Thursday, September 26, 2019, 14:28: Auto-cooling @ 2A per min.

Friday, September 27, 2019, 07:17: HV off.

Friday, September 27, 2019, 07:19: RGA off

Friday, September 27, 2019, 07:21: Close & reset IV4.

Friday, September 27, 2019, 07:23: Power / Sources off. Ion gauge & Turbo pumps off.

Friday, September 27, 2019, 10:29: Venting. Waterlines purged.

 Monday, September 16, 2019, 10:03: The rightmost alignment pin has been reinstalled (see picture attached). It was previously removed for Ferran's test. 

Thursday, August 29, 2019, 14:47 : Changing back to the nominal wiring 

Thursday, August 29, 2019, 17:01: TIS changed to Ferran's heat shield. 

Thursday, August 29, 2019, 17:02: 9-pin FT redone.

Friday, August 30, 2019, 00:28: Turbos on 

Friday, August 30, 2019, 00:36: IG1 on. 

Tuesday, September 03, 2019, 09:09: RGA on. Vacuum stable @ 2.1e-6T 

Tuesday, September 03, 2019, 15:00. Wire redone. Crosschecked by Arthur Leung. 

Tuesday, September 03, 2019, 15:16: Turbos tripped. TSG:CG1A above 50 mTorr 

Wednesday, September 04, 2019, 09:34 : Turbos on.  After the bakeout it will be better to have TSG:CG1A checked.

Wednesday, September 04, 2019, 09:43: IG1 on 

Wednesday, September 04, 2019, 09:45: RGA on 

Wednesday, September 04, 2019, 12:42 : Waterlines opened. No response on RGA. Vaccum stable @ 3.1e-6 T

Wednesday, September 04, 2019, 14:53 : Auto-ramping TGHT / TBHT to 100/ 100 A @ 4 A/min.

Wednesday, September 04, 2019, 16:04:  Auto-ramping TGHT / TBHT to 250/ 250 A @ 4 A/min.

Wednesday, September 04, 2019, 17:33: Final auto-ramping of the day TGHT / TBHT to 290/ 290 A @ 4 A/min. Vacuum stable@2.7e-7T

NB: Ferran's HS doesn't have an extraction electrode. Since the purpose of the heating is to "baked-out" the system, this is actually great as the shine will go downstream the beamline.

Thursday, September 05, 2019, 08:05:  Auto-ramping TGHT  to 580 A @ 2 A/min. Vacuum stable @2.97e-7T

Thursday, September 05, 2019, 09:30: TGHT PS is voltage-limited @440A and 5.2V. Stopping auto-ramping to increase the voltage limit to 7.7 (from previous screenshots).

Thursday, September 05, 2019, 09:31: Auto-ramping TGHT to 580A @ 2A/min.

Wednesday, May 15, 2019, 08:58: Optics/ HV on.

Monday, September 09, 2019, 16:05: Optics set. IV4 open.

Monday, September 09, 2019, 17:26: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Twenty minutes w/o sparks

Monday, September 09, 2019, 17:52 Optics/HV off

Tuesday, September 10, 2019, 10:05:  Auto-cooling 4A/min

Tuesday, September 10, 2019, 13:27: IV4 closed.

Tuesday, September 10, 2019, 13:27: IG1 off. RGA off

Tuesday, September 10, 2019, 13:28: Turbos off

Wednesday, September 11, 2019, 09:21: Venting.

Wednesday, September 11, 2019, 09:24 HS waterline purged

Wednesday, September 11, 2019, 10:54:  Cleaned the interior of chamber with methanol and Kim-wipes. Some dust and debris were removed with

Wednesday, September 11, 2019, 10:54 : Adding EE to the Assy.

Wednesday, September 11, 2019, 11:03: Roughing.

Wednesday, September 11, 2019, 11:35: Turbos on

Wednesday, September 11, 2019, 11:47: Turbos at  speed.

Wednesday, September 11, 2019, 11:48: IG1 on

Wednesday, September 11, 2019, 11:54: RGA on

Friday, September 13, 2019, 08:56: RGA off. IG1 off.

Friday, September 13, 2019, 08:56: Turbos off

Monday, September 16, 2019, 08:11: Venting

Monday, September 16, 2019, 09:58: Assembly removed.

Thursday, August 15, 2019, 16:17: Q FT undone to remove the connection to the 9-pin

The idea is to change the cables to have individual signals. This will allow 4 thermocouple readings.

NB: The FT is not vacuum tight as of now  (gasket needs to be replaced and flange needs to be tight)

Tuesday, August 13, 2019, 11:55: Close PV1. Turn off RP1.

Tuesday, August 13, 2019, 12:02: RP1 replaced.

Tuesday, August 13, 2019, 13:24: TS exhaust / screen cleaned out.

Tuesday, August 13, 2019, 13:25: RP1 on

Tuesday, August 13, 2019, 13:59: Turbo pumps on.

Tuesday, August 13, 2019, 14:05: IG1 on.

Wednesday, August 14, 2019, 09:17: Revising the archiver, on July 8th at around 4 am, the vacuum on GC1A increased from normal levels to around 0.2 T. This happened while the target was held at a high combined current from both TGHT PS and Coil PS. See screenshots attached.

Thursday, August 15, 2019, 09:57: Vacuum is only around 1.06e-06T.  Turbo pumps off. Ion gauge off. 

Tuesday, August 20, 2019, 08:59: Ion gauge acting funny. CG1A unplugged & re-plugged in. Seems to work now?

Inserted a used (heating) LP-FEBIAD target with a basic heat shield assembly with no end plate foil on the window side to observe heating. The P2N Coil / TGHT connections were added.

Test whether the TS connections are affecting the P2N heating or if it's the P2N target itself.

-Heat the TGHT only, observe, then ramp down.

-Heat Coil only, observe, then ramp down.

-Heat TGHT w/ Coil, observe, then ramp down.

Note* Heating should be even across the target. Elog & take pictures.

NO HV ALLOWED!!!!

Thursday, August 08, 2019, 09:05: Roughing.

Thursday, August 08, 2019, 09:14: BV1A closed to allow pressure stabilization. Opened about within 2 seconds later with BV1B.

Thursday, August 08, 2019, 09:41: Turbo pumps on.

Thursday, August 08, 2019, 09:47: Ion gauge on.

Thursday, August 08, 2019, 10:37: RGA on.

TSG:CG1A & TSG:CG1B do not appear to be pumping down efficiently - May need to swap out TSG:RP1 after this test. Last done April 18, 2018. elog: 655.

Friday, August 09, 2019, 08:49: Power on.

Friday, August 09, 2019, 08:51: Waterlines opened. No response on RGA. Vacuum ok @ 3.03e-06T

Friday, August 09, 2019, 08:56: Auto-ramping TGHT  @ 4 @ per min to 150 A.

Friday, August 09, 2019, 10:10: Ramping the TGHT down from 150 A to 0A.

Friday, August 09, 2019, 10:39: Anode Current @ 200 mA w/ 19V? Anode PS on. Voltage & current dropped off.

Friday, August 09, 2019, 11:18: TGHT and TBHT power supplies ramped to 150A each, total of 300A in the target

Friday, August 09, 2019, 13:12:  Target glows symmetrically. TGHT and TBHT ramped from 150A to 200A each for a total of 400A on the target

Friday, August 09, 2019, 14:05: RGA error.

Friday, August 09, 2019, 14:08: RGA Restarted.

Friday, August 09, 2019, 14:08: Target heating evenly on total 400 A.

Friday, August 09, 2019, 15:57:  Auto-ramping TGHT/TBHT  @ 4 @ per min to 250/250 A.

Friday, August 09, 2019, 16:28: Vacuum limit reach at 241 and 238 A for TGHT and TBHT, respectively.

Friday, August 09, 2019, 16:28: Auto-cooling started at 4A/min

Monday, August 12, 2019, 09:22: Sources off. RGA off.

Monday, August 12, 2019, 10:04: Power off. Ion gauge off. Turbos off.

Wednesday, August 07, 2019, 15:12:  Arthur helped inspected the electric connections on the TS.

One of the coil positive waterlines  was touching a HS waterline. Manually adjusted them to have a better clearance.

Tuesday, August 06, 2019, 16:00

Start ramp up to 300+300 = 600 A

Tuesday, August 06, 2019, 17:30

Wednesday, August 07, 2019, 08:11

The same p2n target was installed in the test stand, taking off the ion source since we thought it could have been shorting to the reference electrode and providing a return path for the current, hence generating the asymmetric heating that was noticed on the target.

On Tuesday 6th afternoon, the p2n was ramped up to 600 A (300 + 300 A from TGHT and TBHT in parallel). The target and its right flexible leg were still glowing. After noticing it, the current was ramped down wating to open up for inspection.

Friday, August 02, 2019: p2n target installed in the test stand, the ion source was fully removed to avoid any risk of shorting. The Central ion source current lead is attached to the target body so it was left there and attached to its electrodes.

Friday, August 02, 2019, 13:15: Roughing.

Friday, August 02, 2019, 13:58: BV1A closed to allow pressure stabilization. Opened about 10-15 seconds later with BV1B.

Friday, August 02, 2019, 14:00: Turbos pumps on.

Friday, August 02, 2019, 14:09: Ion gauge on.

Friday, August 02, 2019, 15:15: RGA cycled. Now the filament can start. RGA on.

Tuesday, August 06, 2019, 07:49: RGA Error. Halted.

Tuesday, August 06, 2019, 07:53: Restarted RGA.

Tuesday, August 06, 2019, 09:32: Waterlines opened on FS#5. No response on RGA. Vacuum ok @ 1.16e-06T.

Power on.

The p2n target was taken out of the test stand for inspection. Comments and measurements on the container below:

- Initially, continuity measurements were mode between the target and heat shield (HS) while they were still in the test stand, and looks like they were shorted. However, after removing the HS from the test stand, no short was seen, not even after moving the target legs. Instead, we confirmed that the short was happening in the test stand, so some water lines were touching each other. 

- The target look in one piece, except for the ion source that came off right after manufacturing. (see picture)

- The insulator connecting the bottom section of the ion source central current lead, to the HS, was broken (see picture)

- The annular disc of the connecting the inner and outer tube of the ion source was bulging outwards, maybe the ion source was heating too much while we put current in it (see picture).

- The screw connecting the top part of the central ion source current lead, is now of a blue-ish color

Resistance measurementts:

- Copper to copper: 1008 microOhm

- Copper to bottom flexy leg: 101 microOhm

-  Bottom-to-top (flexy): 30-45 microOhm

- Target: 476 microOhm

- Copper to top flexy: 261 microOhm

- Copper to bottom flexy (left): 100 microOhm

- Copper to bottom flexy (right): 94 microOhm

- Top Flexy - botton target assy (left): 88 microOhm

From left to right:

- Cu to bottom flexy leg: 102

- Flexy bottom to flexy top: 31

- Flexy top left to flexy top right: 473

- Flexy top to flexy bottom: 0 (???)

- flexy bottom to Cu: 93

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.