(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.

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

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

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.

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.

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.

 The electrical feedthroughs at the top of the test stand module were reconfigured to deliver up to 1200A to the p2n target.

1) The two COIL lines (one + and one -) were disconnected from their terminals E and F

2) The TBHT terminals (two + and two -) were disconnected from A and B

3) The two TBHT positive terminals are connected to E and G respectively. The two TBHT negative terminals are both connected to F, and a 4/0 cable is run from F to H

4) The three TGHT + terminals are left connected to D. The three TGHT - terminals are left connected to C

In the vacuum chamber, COIL and TGHT terminals of the same polarity are shorted by means of thick copper bars specifically machined to match the test stand terminals geometry. The test can proceed by ramping both TGHT and TBHT up to 600 A each, possible at the same time and speed.

The wiring diagram is shown in the attached picture 

Extech measurements before heating (µOhm):

TGHT Left leg Ta-Cu: 205, 215, 212, 201.

TGHT Right leg Ta-Cu: 287, 295, 275, 292.

TGHT Ta legs: 596, 606, 597, 598.

TBHT A: 1470, 1471.

TBHT B: 1469, 1469.

Wednesday, July 22, 2020, 16:21

Rampup finished around 2PM, looks good. Around 300+300A the TBHT voltage limit prevented the TBHT current to increase, and instead it decreased. Aaron ramped it down, adjusted the voltage limit and proceeded without issues.

The water flow and temperatures looked fine.

Attached the plots and a picture at 1200A

 Thursday, July 23, 2020, 11:53

Frank Song checked for us the status of the test stand. Pictures looked good, despite the reflections, I can't see sign of the flexy legs glowing. Thank you Frank!

The voltage on the TGHT has dropped 0.02 V, and the voltage on the TBHT (COIL lines) has dropped by 0.04V in 20 hours. I think it's negligible, just a sign of some sintering.

The cooling parameters are as follows:

Input 1: 28.05 C

Input 2: 8.49 lpm

Input 3: 27.79 C

Input 4: 11.14 lpm

Input 5: 27.72 C

Input 6: 3.90 lpm

Input 7: 27.78 C

Input 8: 7.79 lpm

Friday, July 24, 2020, 16:42

This morning I saw the target for my first time and not in a picture. I could see a mild glow in the center of both flexy legs, while the external foils seemed cold. This seems really good, as expected!

Water parameters were checked:

Input 1: 27.75 C

Input 2: 8.38 lpm

Input 3: 27.52 C

Input 4: 11.13 lpm

Input 5: 27.37 C

Input 6: 3.93 lpm

Input 7: 27.53 C

Input 8: 7.78 lpm 

Monday, July 27, 2020, 09:35

Aaron's measurement from today at 7:30am

 Input 1: 26.61 C

Input 2:  8.25 lpm

Input 3: 26.35 C

Input 4: 11.19 lpm

Input 5: 26.21 C

Input 6: 3.84 lpm

Input 7: 26.35 C

Input 8: 7.76 lpm

FM

Thursday, July 30, 2020, 15:53: Auto-cooling TGHT/TBHT to 0 @ 4 A/min 

Thursday, July 30, 2020, 23:02

Ramp down terminated around 7pm, the current was ramped smoothly but the voltage from both PS (TGHT and TBHT) had some bumps in correspondance with vacuum response. Maybe something was shorting? A thorough inspection of the heat shield and target might tell more.

Thanks Fernando for ramping down! 

Tuesday, August 04, 2020, 07:33: PS / sources off. Lock out. IG & Turbo pumps off. Purge waterlines. - AS

Tuesday, August 04, 2020, 09:32

Started rewiring the test stand.

TBHT+ (A1 and A2): connected to A

TBHT- (B1 and B2): connected to B

COIL+ (A3): connected to E

COIL-(B3): connected to F

4/0 short connection from F to H removed

Tuesday, August 04, 2020, 15:27

Extech measurements after heating (µOhm):

TGHT Left leg Ta-Cu: 160, 176, 184, 180

TGHT Right leg Ta-Cu: 49, 48, 52, 53.

TGHT Ta legs: 470, 469, 463, 480.

TBHT A: 2400, 2229,2492.

TBHT B: 2361, 2411, 2412.

Friday, October 16, 2020, 11:11: Roughing.

Friday, October 16, 2020, 11:39: TP1B on.

Friday, October 16, 2020, 12:29: TP1A on. 

Monday, October 19, 2020, 07:59: Waterlines opened. Vacuum ok @ 6.20e-07T

Monday, October 19, 2020, 08:01: Power / Sources on.

Monday, October 19, 2020, 08:02: Auto-ramping TGHT / TBHT to 350 / 150 A @ 2 A per min.

Monday, October 19, 2020, 08:03: IV4 opened.

Monday, October 19, 2020, 08:09: Optics on / set.

Monday, October 19, 2020, 08:16: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Monday, October 19, 2020, 12:47: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. 

Monday, October 19, 2020, 15:50: Initial wire scans were good. MB1 requires a polarity reversal

Monday, October 19, 2020, 16:00: Auto-cooling TGHT / TBHT to 300 / 10 A @ 1 A per min. Stop manually.

Monday, October 19, 2020, 18:11: TBHT @ 100 A halt. Auto-cooling TGHT to 300 @ 1 A per min. Stop manually.

Monday, October 19, 2020, 19:16: TGHT @ 300 A halt.

Tuesday, October 20, 2020, 06:15: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. 

Tuesday, October 20, 2020, 09:30: HV off. IV4 closed. Switching MB1 polarity.

Tuesday, October 20, 2020, 13:30: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. MB1 on

Tuesday, October 20, 2020, 14:10: Mass scans working

Tuesday, October 20, 2020, 14:17:

 Tuesday, October 20, 2020, 15:15: IV4 opened. 

Thursday, October 22, 2020, 11:35: HV to 0 kV.

Thursday, October 22, 2020, 11:36: Auto-cooling @ 1 A per min. 

Monday, October 26, 2020, 11:40: IV4 closed / reset

Monday, October 26, 2020, 11:41: PS off.

Monday, October 26, 2020, 11:42: IG1 / Turbo pumps off. Purging waterlines.

Monday, October 26, 2020, 13:00: Venting.

 Wednesday, April 28, 2021, 22:30

First P2N heating test ongoing.

At P2NHT ~ 570 A and TBHT ~ 100 A shine is already seen, which suggests that current is flowing in the P2N target properly, see picture attached.

Most of the ramping is carefully monitored because the good vacuum signal from the TTS ramping procedure is obviously not working (bypassed), and if the pressure goes past 1E-5T the whole ITS should interlock and abruptly drop the currents, which we want to avoid.

Wednesday, April 28, 2021, 23:16

P2NHT set current = 810 A

P2NHT read current = 800 A

Master and slave have balanced fully, TBHT ramping still proceeds manually. I'm trying to get it to ~200A before leaving.

 Thursday, April 29, 2021, 00:54

Ramping successfully achieved.

P2NHT_Master = 594 A - 4.59 V

P2NHT_Slave = 611 A - 4.89 V

P2NHT = 1207 A

TBHT = 231 A - 2.29 V

Max temperature of welding cables = 40 deg

Zero current from the HV ground terminal (feedthrough I) to slave negative (feedthrough H)

Monday, June 07, 2021, 13:44: Roughing.

Monday, June 07, 2021, 14:16: TP1B on. (Tripped shortly after?)

Monday, June 07, 2021, 14:32: Unstable. Venting.

Monday, June 07, 2021, 15:05: Changed gaskets. Left side suspect. Roughing.

Monday, June 07, 2021, 15:35: TP1B on.

Monday, June 07, 2021, 15:42: TP1B up to speed.

Monday, June 07, 2021, 15:45: TP1A on.

Monday, June 07, 2021, 16:01: IG1 on.

Monday, June 07, 2021, 16:02: FS#5 opened. No response on backing lines. TSG:IG1 ok.

Tuesday, June 08, 2021, 08:01: Power / sources on.

Tuesday, June 08, 2021, 08:07: Reset / CFG optics & steering.

Tuesday, June 08, 2021, 08:08: TGHT / TBHT @ 10 A ok. BIAS / EE / EZL @ 5 / -0.5 / 1 kV. Quick system check ok.

Tuesday, June 08, 2021, 08:13: Auto ramping TGHT / TBHT to 350 / 150 @ 2 A per min.

Tuesday, June 08, 2021, 08:19: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. Small spark near 30 kV while bringing up the HV.

Tuesday, June 08, 2021, 08:25: IV4 open. Optics set minus TPS:CB2. Shows as green 'on', set to 500V, however read back shows as 0 V.

Tuesday, June 08, 2021, 12:44: Auto ramping TGHT / TBHT to 580 / 230 @ 2 A per min. 

Tuesday, June 08, 2021, 15:53: Beam on FC0 ok. Optics set minus TPS:CB2, however FC6 is disconnected. auto-cooling @ 3 A per min.

Tuesday, June 08, 2021, 18:32: Auto-cooling halted. TGHT @ 104.3 A. 

Wednesday, June 09, 2021, 07:13: Auto-cooling continued @ 2 A per min. 

Wednesday, June 09, 2021, 08:37: HV off. Attempts made to restart TPS:CB2 unsuccessful. Controls notified.

Wednesday, June 09, 2021, 10:33: Power /  sources off. FS#5 purged. IV4 closed. IG1 & IG6 off. All turbo pumps off.

Wednesday, June 09, 2021, 11:52: Venting VV1 & VV6.

Installed a new window on MB1 as per Aurelia. Connect modified 9 pin connector & voltage meters for Ta#62 testing.

Ref:

https://elog.triumf.ca/TIS/Test-Stand/679

Pin configuration between top 9-pin connector on Source Tray and terminal in high voltage rack. Measured 2018-08-21 by Aaron and Anders

Wednesday, June 09, 2021, 14:41: Pins connected source tray side: 1, 4, 5, 6

https://elog.triumf.ca/TIS/Test-Stand/721

ST 9-pin                       HV rack

Pin to L TGHT - 1 - Black / COM / 5

Pin to R TGHT - 6 - Red / 9

Pin to L TBHT - 4 - Black / COM / 2

Pin to R TBHT - 5 - Red / 1

Wednesday, June 09, 2021, 14:29: Window installed. Roughing -  Beam line side.

Wednesday, June 09, 2021, 14:41: TP6 on.

Wednesday, June 09, 2021, 14:45: TP2 on.

Wednesday, June 09, 2021, 14:55: Roughing.

Wednesday, June 09, 2021, 16:09: TP1 on.

Thursday, June 10, 2021, 13:25: Power / sources on. FS#5 open.\

TGHT reading ok , TBHT odd? Internal connection.

Thursday, June 10, 2021, 14:45: Turbo pumps off.

Thursday, June 10, 2021, 15:25: Venting.

Thursday, June 10, 2021, 16:16: Fixed TBHT connection. Roughing.

Thursday, June 10, 2021, 16:20: Bypass used. TGHT / TBHT to 40 A each. Multimeter check ok.

Thursday, June 10, 2021, 16:24: TGHT / TBHT to 0 A. Bypass removed.

Thursday, June 10, 2021, 16:43: TP1B on.

Thursday, June 10, 2021, 16:48: TP1A on.

Thursday, June 10, 2021, 16:55: IG1 on

Tests Complete as per Aurelia.

Monday, June 21, 2021, 07:51: Power / sources off. IG1 & IG6 off. All TP off. FS#5 purged.

Monday, June 21, 2021, 09:40: Venting both ends.

Replace 9-pin back to normal grounded setup. Re-salt Ta#62. (Cu Gaskets in-use on FS#5)

Monday, June 21, 2021, 11:30: Roughing chamber.

Monday, June 21, 2021, 11:50: Removed backing window. Roughing beam line side.

Monday, June 21, 2021, 12:01: Multimeters removed. Back HV rack re-grounded. TP6 & TP2 on.

Monday, June 21, 2021, 12:02: TP1B on.

Monday, June 21, 2021, 12:13: TP1A on.

Monday, June 21, 2021, 12:21: IG1 on.

Monday, June 21, 2021, 14:37: Vacuum @ 3.96e-06T. Open FS#5

Monday, June 21, 2021, 14:39: Vacuum @ 3.76e-06T.

Monday, June 21, 2021, 14:42: Power / Sources on.

Monday, June 21, 2021, 14:43; IV4 opened & Optics on

Tuesday, June 22, 2021, 07:40: Quick system check ok.

Tuesday, June 22, 2021, 07:42: Auto-ramping TGHT / TBHT to 300 / 150 A @ 3 A per min.

Tuesday, June 22, 2021, 09:36: TGHT / TBHT @ 300 / 150 A. BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Tuesday, June 22, 2021, 09:38: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min.

Tuesday, June 22, 2021, 09:46: External / cage sparks* Multiple.

Tuesday, June 22, 2021, 09:58: Turn down BIAS to 25 kV.

Tuesday, June 22, 2021, 12:45: BIAS to 30 kV.

Tuesday, June 22, 2021, 13:05: Odd. There was activity on FC0 right when the HV was turned on before the 580 ramp up. Now, no activity on FC0, or wire scans. Turning HV down / off.

Tuesday, June 22, 2021, 13:10: BIAS / EE / EZL @ 0 kV.

Tuesday, June 22, 2021, 13:41: Rear cage opened. Digital multi-meter was removed.

Tuesday, June 22, 2021, 13:48: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Tuesday, June 22, 2021, 13:57: No beam. Auto-cooling @ 3 A per min.

Tuesday, June 22, 2021, 16:23: HV power off. Optics off. IV4 off. TGHT still cooling.

Wednesday, June 23, 2021, 04:31: IG1 & turbo pumps off. 

Wednesday, June 23, 2021, 06:00: Venting. Power off. FS#5 purged.

Wednesday, June 23, 2021, 12:22: Roughing.

Wednesday, June 23, 2021, 13:22: TP1B on.

TP1B tripped.

Wednesday, June 23, 2021, 15:05: TP1B was restarted.

Wednesday, June 23, 2021, 15:15: TP1B on.

Wednesday, June 23, 2021, 16:21: TP1A started.

Wednesday, June 23, 2021, 16:30: IG1 on.

Wednesday, June 23, 2021, 17:53: FS#5 opened. Vacuum @ 7.52e-06T

Wednesday, June 23, 2021, 17:56: Vacuum Stable. Power on. TGHT / TBHT on.

Thursday, June 24, 2021, 05:40: Auto-ramping TGHT / TBHT to 300 / 150 A @ 2 A per min. 

Thursday, June 24, 2021, 09:00: IV4 Opened.

Thursday, June 24, 2021, 09:02: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min.

Thursday, June 24, 2021, 09:10: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. Optics on & set

Thursday, June 24, 2021, 12:52: Mass / Wire scans complete

 Thursday, June 24, 2021, 14:00: Auto-cooling @ 2 A per min.

 Thursday, June 24, 2021, 14:08: Auto-cooling aborted. TGHT / TBHT back to 580 / 230 A. Checking the emittance rig.

Thursday, June 24, 2021, 22:20: Auto-Cooling & HV off. - CB

Friday, June 25, 2021, 05:32: Sources off. IV4 closed. IG1 & Turbo pumps off.  

Friday, June 25, 2021, 07:09: IV4 reset. Power off. Venting.

Replacement Ta target for the previous one (44139-10) https://elog.triumf.ca/TIS/Test-Stand/880

Friday, June 25, 2021, 11:16: Roughing.

Friday, June 25, 2021, 11:55: TP1B started.

Friday, June 25, 2021, 12:00: TP1B on. TP1 A started.

Friday, June 25, 2021, 12:08: IG1 on.

Friday, June 25, 2021, 12:23: Vacuum @ 1.06E-05T. Open waterline FS#5.

Friday, June 25, 2021, 12:26: Vacuum @ 9.97E-06T. OK.

Friday, June 25, 2021, 12:30: Power / sources PS on.

Friday, June 25, 2021, 12:34: Full check for remote use. IV4 open (OK)

Vacuum @ 6.70e-06T

TGHT / TBHT @ 10 / 10 A

BIAS / EE / EZL @ 1 / -0.1 / 0.5 kV.

Ready for operation.

Friday, June 25, 2021, 12:39: All back to 0 Kv / 0 A. Wait for vacuum stabilization.

Sunday, June 27, 2021, 03:55: Auto-ramping TGHT / TBHT to 500 / 150 A @ 2 A per min.

Sunday, June 27, 2021, 04:04: BIAS / EE / EZL @ 20 / -1.0 / 10 kV. 

Sunday, June 27, 2021, 09:36: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min.

Sunday, June 27, 2021, 10:07: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.  

Sunday, June 27, 2021, 10:16: TGHT / TBHT @ 580 / 230 A. Vacuum @ 1.25e-06T.

Sunday, June 27, 2021, 11:20: Mass & wire scans complete. Vacuum @ 1.14e-06T. Auto-cooling @ 2 A per min.

Sunday, June 27, 2021, 15:07: BIAS / EE / EZL @ 0 kV. TGHT still cooling.  

Monday, June 28, 2021, 06:17: IV4 closed (Needs reset). Sources, IG1, turbo pumps, off 

Monday, June 28, 2021, 08:22: Power off. IV4 reset. Venting.

Monday, October 04, 2021, 15:38: Roughing.

Monday, October 04, 2021, 16:08: TP1B on. 

Monday, October 04, 2021, 16:15: TP1 A on. 

Monday, October 04, 2021, 16:41: IG1 on.

Tuesday, October 05, 2021, 06:47: Vacuum @ 4.09e-06T.

Tuesday, October 05, 2021, 06:49: Waterlines opened. Vacuum stable.

Tuesday, October 05, 2021, 06:50: Power / sources on.

Tuesday, October 05, 2021, 06:52: Auto-ramping TGHT to 580 A @ 2 A per min.

Wednesday, October 06, 2021, 05:44: Auto-cooling @ 3 A per min. Vacuum @ 2.37e-06T.\

Wednesday, October 06, 2021, 09:37: Power / sources off.

Wednesday, October 06, 2021, 09:38: IG1 off. TSG:TP1 A & B off.

Wednesday, October 06, 2021, 11:11: Venting. Waterlines off.

Edit* Switched from ITW to ITE. on station icon - AS.

Friday, November 12, 2021, 13:01: BV1B open. Roughing.

Friday, November 12, 2021, 13:05: BV1A open.

Friday, November 12, 2021, 13:34: TP1B on.

Friday, November 12, 2021, 13:42: TP1A on.

Friday, November 12, 2021, 13:50 : IG1 on. TMS:TP2 trip. Fast reset. OK. Vacuum @ 3.54e-05T. Waterline FS#5 open.

Friday, November 12, 2021, 13:53: Vacuum @ 2.12e-05T. Ok

Friday, November 12, 2021, 13:54: Power / sources on.

Monday, November 15, 2021, 09:00: Auto-ramping TGHT / TBHT to 350 / 150 @ 3 A per min. IV4 open. TMS:VCB1 not functioning. Controls group notified.

Monday, November 15, 2021, 09:40: Optics set minus TMS:VCB1 

Monday, November 15, 2021, 11:16: Auto-ramping TGHT / TBHT to 580 / 230 @ 2 A per min.

Monday, November 15, 2021, 11:34: TMS:VCB1 fixed. Optics set ok.

Monday, November 15, 2021, 11:43: BIAS / EE / EZL @ 30 / -1.5 / 13 kV.

Monday, November 15, 2021, 15:44: Mass & wire scans complete. OK. HV to 0 kV. IV4 closed.

Tuesday, November 16, 2021, 06:16: Auto-cooling TGHT / TBHT @ 2A per min.

Tuesday, November 16, 2021, 11:13: Power / sources off.

Tuesday, November 16, 2021, 11:14: IG1. Turbo pumps off.

Tuesday, November 16, 2021, 12:12: Venting.

Beginning of May:

The cabling on the top of the test stand was changed to adapt for P2N testing. The TGHT and COIL PS were disconnected, and their DC cable terminals were connected instead to the TDK-LAMBDA P2Nheaters. The configuration on top of the ITS module is the following:

TBHT+ = A

TBHT- = B

MASTER+ = D

MASTER- = C

SLAVE+ = G/E

SLAVE- = F/H

Friday May 6th, afternoon

Once the pressure was almost stable in the low E-6 torr range, the first rampup was conducted up to ~600 A and the I,V parameters looked similar to previous P2N units. More tests to full current happening next week.

Monday, May 09, 2022, 09:29

P2N unit is being heated now, the automatic ramping utility is ramping the TDK-LAMBDAs while the TBHT is being increased manually.

Monday, May 09, 2022, 10:31

A voltage event happened, the TBHT voltage increased frmo 0.64 V to 0.73 V, while the P2Nheater dropped from  1.73 V to 1.56 V. 

Monday, May 09, 2022, 12:19

At P2NHT=950A it was noticed that one leg of the P2N was glowing much more than the other, the ramping was first stopped and then ramped down.

Now the P2NHT=282A and TBHT=47A

Tuesday, May 10, 2022, 09:32

Test stand vented and target inspected, there is no obvious sign of damage or misconnection on the tantalum assembly. Some resistance measurements were taken across target elements and connections: 

Screw on copper L to bottom flexy leg L = 117

Bottom flexy leg L to top flexy leg L = 24 / 0 (?)

top flexy leg L to bottom elephant leg L = 64

elephant L to elephant R = 360

top flexy leg R to bottom elephant leg R = 69

Screw on copper R to bottom flexy leg R = 125

Tuesday, May 10, 2022, 11:39

This morning, the target was inspected but nothing major was noticed, hence it was put back in the ITS for heating.

Tuesday, May 10, 2022, 17:40

Target being ramped: so far all good, total current in P2NHT=690A and TBHT=116A

A current measuring clamp was used to measure current in the 4/0 cables. The only bad thing is that the slave outputs half the current than the master, making the cables hotter (30deg vs 24deg).

Currents:

A-B ~116 A (TBHT)

C~468

E~124

G~102

Tuesday, May 10, 2022, 17:45

Event: reduction in P2NHT voltage and increase in TBHT voltage. After letting the PS ramp, it was noticed that the P2NHT voltage accelerated its increased, and the left leg started glowing like the previous time. The current was immediately ramped down, but still there was a voltage spike upwards in the P2NHT. 

While the leg was glowing hot, the current between feedthroughs H (P2NHT-) and I (HV common) was 90A. Now that the "episode" is not there any more, the current is zero

Wednesday, May 11, 2022, 10:55 

The previous P2N target had stainless steel screws at the bottom, where the copper L-shaped connector and the ta foil legs connect, which might have bene the cause of the gap opening and voltage increase. Now, the target manufactured for the previous beamtime is used, which does not have the cuts on the elephant ears but they are OK since don't interfere with the new IS cup design, and are ~3mm away from it.

Wednesday, May 11, 2022, 13:57 

 Start heating the new P2N assembly

Wednesday, May 11, 2022, 14:58

 Stopped at

P2NHT= 501 A

TBHT= 95 A

All currents seem to be flowing in the right path, with no current in the jumper between H-I

Wednesday, May 11, 2022, 15:26

Voltage step in P2NHT and TBHT happened again. Current sum:

A = 125 A

B = 125 A

C= 470 A

D=474 A

E = 118 A

F= 85 A

G = 95 A

H = 132 A

Short G-E = 5 A

Short F-H = 3 A

Jumper H-I = 62 A

The most likely explanation of this jump is that the IS tip touches the plasma electrode as shown in the drawing below which would result in some current flowing through the jumper, more investigations are needed

Thursday, May 12, 2022, 08:19

Test stand opened, there is some sign of burn in the plasma electrode, but it's hard to say if it's because they were touching. Aaron added a tantalum 0.040" shim to the plasma electrode to distance it further from the target IS tube

Thursday, May 12, 2022, 13:20

ITS with P2N target installed and pumping down 

Thursday, May 12, 2022, 15:50

P2NHT started ramping 

 Ref: https://elog.triumf.ca/TIS/Test-Stand/924. During testing, it was noted one leg was glowing vs the other. P2N assembly was removed & inspected. No contact or defects were found.

Tuesday, May 10, 2022, 10:05: Roughing.

Tuesday, May 10, 2022, 10:42: TP1 on.

Tuesday, May 10, 2022, 10:50: TP1A on.

Tuesday, May 10, 2022, 10:58: IG1 on. Vacuum @ 1.77e-05T & dropping.

Tuesday, May 10, 2022, 13:45: Vacuum @ 5.63e-06T. FS#5 Opened.

Tuesday, May 10, 2022, 13:58: Vacuum @ 5.27e-06T.

Target oven #45241-1 swapped out. SS bolts were in use on the legs.

Molybdenum screws in the legs on oven #44812-2. No target to ion source cup interference. 3mm gap - OK.

TGHT - R: 1.215

TGHT - L: 1.206

TBHT - R: 2.014

TBHT - L: 2.013

Cathode cable detached from feed-through (B).

Wednesday, May 11, 2022, 10:04: Roughing.

Wednesday, May 11, 2022, 10:33: TP1B on.

Wednesday, May 11, 2022, 10:43: TP1A on.

Wednesday, May 11, 2022, 10:51: IG1 on.

Wednesday, May 11, 2022, 13:43: Vacuum @ 5.43e-06T. FS#5 Open.

Wednesday, May 11, 2022, 13:45: Vacuum @ 5.36e-06T. OK.

PE shimmed & extended 1mm due to likely ion source contact.

Thursday, May 12, 2022, 10:41: Roughing.

Thursday, May 12, 2022, 11:26: TP1B on. 

Thursday, May 12, 2022, 11:35: TP1A on.

Thursday, May 12, 2022, 11:43: IG1 on.

Thursday, May 12, 2022, 11:48: Vacuum @ 2.65e-05T. FS#5 Opened. No immediate spike.

Thursday, May 12, 2022, 11:50: Vacuum @ 2.47e-05T & dropping.

Friday, May 13, 2022, 07:32: TP/IG off.

Friday, May 13, 2022, 09:51: Venting.