Friday, July 19, 2013, 14:14 : Stopping Turbos. Vacuum at 1.3E-7 T 

Friday, July 19, 2013, 15:14:  Venting

Friday, July 19, 2013, 16:22: Target installed. Roughing.

Friday, July 19, 2013, 16:41: Starting turbos

Friday, July 19, 2013, 16:49: Turbos at speed

Friday, July 19, 2013, 16:51 : Vacuum at 1.4E-5 T

Monday, July 22, 2013, 08:19: Opened up water flow. Vacuum stable at 1.3E-7 T after some minor bumps to 1.6E-7 T

Monday, July 22, 2013, 13:34: T/C logger installed on 9-pins 4 & 5. Ray is working in the HV cage to install a different PS for the magnet coil.

Monday, July 22, 2013, 14: Increasing Coil current manually. Vacuum starts to creep up at 3A (T/C around 85 deg C).

Monday, July 22, 2013, 16:37: Current at 4A. Voltage at 6.5V. T/C around 400 deg C.

Tuesday, July 23, 2013, 08:50: Coil conditioned to ~500 deg C at about 4.7A

Tuesday, July 23, 2013, 08:54: Evacuating gas line through the chamber.

Tuesday, July 23, 2013, 09:01: Gas lines evacuated.

Tuesday, July 23, 2013, 09:10: Coil current to zero.

Tuesday, July 23, 2013, 09:22: Target. biased

Tuesday, July 23, 2013, 09:22: Opened IV4

Tuesday, July 23, 2013, 09:32: ANODE to 200V. Helium leak to 6.0

Tuesday, July 23, 2013, 09:35: Coil temp at 220 deg C.

Tuesday, July 23, 2013, 10:58: Heating aborted at 200A. Will resume later.

Tuesday, July 23, 2013, 12:01: Restarted heating to 250A.

Tuesday, July 23, 2013, 13:11: Spark too out some optics. Restarted.

Tuesday, July 23, 2013, 14:39: COIL 130 deg C. TBHT at 280A read back.

Tuesday, July 23, 2013, 14:44: Sparking occurs across the spark gap on top of the test stand.

Tuesday, July 23, 2013, 16:14: Lowered TBHT to 270 read back. Will leave it like this over night.

Friday, July 26, 2013, 10:09: Cooling down TBHT.

Friday, July 26, 2013, 11:13: ANODE and COIL OFF. Closed IV4. Closed gas supply.

Friday, July 26, 2013, 12:41: BIAS, EE and EL to zero.

Data on Docushare:

https://documents.triumf.ca/docushare/dsweb/View/Collection-11041

Tuesday, August 20, 2013, 08:13: Roughing gas lines

Tuesday, August 20, 2013, 08:22: Gas lines roughed. Valve closed

Wednesday, September 18, 2013, 16:18: Starting turbos

Wednesday, September 18, 2013, 16:26 : Turbos at speed

Wednesday, September 18, 2013, 16:28 : Vacuum at 2.8 E-5 T

Wednesday, September 25, 2013, 15:11
TGHT flow 5.52, temp 28.6
TBHT flow 5.92, temp 28.5

Thursday, September 26, 2013, 09:25: Stopped turbos. Vacuum at 1.4 E-7 T

Friday, September 27, 2013, 08:35
TGHT flow 5.49, temp 28.2
TBHT flow 5.90, temp 28.0

Friday, September 27, 2013, 10:47: Venting 

Friday, October 31, 2014, 14:47: Starting turbos

Friday, October 31, 2014, 14:57: Turbos at speed. Vacuum at 2.9E-5 T

Monday, November 03, 2014, 10:08 : Opened HS water circuit. Vacuum stable at 1.7E-7 T

Monday, November 03, 2014, 10:22: Starting auto ramping to 228A on TBHT at 1 A/min

Monday, November 03, 2014, 13:44: Target at temperature. Opening IV4.

Monday, November 03, 2014, 14:45: IV4 closed

Monday, November 03, 2014, 15:00: Starting cool down. 1 A/min 

BIAS current limit pot changed from 2.40 to 0.25
EZL current limit pot changed from 0.50 to 0.20

Testing max HV bias with Ray

Tested successfully to plc  limit of 50kV.

Dave M updated limit to 59kV. the limit will reset to 50 kV if PLC is restarted

Friday, December 12, 2014, 14:43: BIAS at 59kV and 55 uA. EZL at 20kV and 73 uA. No sparking observed.

Tuesday, December 16, 2014, 09:12: BIAS and EZL to 40kV and 20kV

Tuesday, December 16, 2014, 09:53: BIAS at 50 kV. One spark w/vaccum response at 50 kV

Tuesday, December 16, 2014, 10:20: BIAS and EZL to 0 to try and restart TP1B TP6

Tuesday, December 16, 2014, 10:33: Both turbos restated. BIAS and EZL at 50 kV and 20 kV

Tuesday, December 16, 2014, 11:23: BIAS at 60 kV. One audible spark with vacuum response.

Tuesday, December 16, 2014, 11:37: Another spark took out TP1B and TP6 again.

Tuesday, December 16, 2014, 11:42: Restarted TP1B and TP6

EE power supply switched on

Wednesday, December 17, 2014, 10:19: BIAS at 60kV for 10 min. EZL at 20kV

Wednesday, December 17, 2014, 13:13 : 3h at 60 kV (see attached screen shot)

Wednesday, December 17, 2014, 13:24: BIAS off

Wednesday, December 17, 2014, 13:40: All power supplies ON. TBHT autoramping to 290 A (240 A0. 4A / min

Wednesday, December 17, 2014, 13:46: IV4 opened

Wednesday, December 17, 2014, 16:10: Source on at 30 kV (previously tested to 50 kV)

Thursday, December 18, 2014, 08:21 : Starget autoraming to 290 A (240 A). 4 A / min

Thursday, December 18, 2014, 08:48: 40 kV

Thursday, December 18, 2014, 08:57: 50 kV

Thursday, December 18, 2014, 09:18: 60 kV. Extracting 1E-7 A on FC0

Thursday, December 18, 2014, 09:29: Increased COIL and ANODE to 3.6 A and 60 V

Thursday, December 18, 2014, 10:11: Large spark? Vacuum in source box compromised 6E-4 T.

Thursday, December 18, 2014, 10:24: Closed IV4 (red, but closed - IG6 vacuum good). Stopping turbos. Vacuum is increasing on CG1.

Thursday, December 18, 2014, 10:26: Shutting off water supply.

Thursday, December 18, 2014, 10:29: Venting through turbo vent valves.

Thursday, December 18, 2014, 10:35: Closed turbo vent valves.

Thursday, December 18, 2014, 10:37: Roughing

Thursday, December 18, 2014, 10:42: Pumping curve changing slope abruptly around 30 T and again around 2.5 T

Thursday, December 18, 2014, 10:48: Stopped roughing

Thursday, December 18, 2014, 12:14 : Venting

Thursday, December 18, 2014, 13:43: Roughing

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

Wednesday, September 14, 2011, 15:33

blah blah blah...