A high voltage test was completed on a target free TM1 in the conditioning station. Only the turbo pumps on the target module were operational due to phase 2 construction. Testing started at 2:51PM with the following vacuum gauge readings, 1.6 x 10^-6 Diagnostics Box, 7.4 x 10^-7 Service Cap, 2.0 x 10^-6 Containment Box. Voltage was increased ~3kV at a time every minute until 21 kV was reached with a current of 0 uA. Voltage was then increased in ~1.5kV steps every 2 minutes until 30 kV was reach at a current of 60uA. This was held for 7 minutes until a spark occurred and the current spiked to 300uA and the voltage dropped. The voltage was dropped back to zero. The vacuum gauges had increased and read the following  1.6 x 10^-6 Diagnostics Box, 7.9 x 10^-7 Service Cap, 2.1 x 10^-6 Containment Box. Testing was restarted 2 minutes later (the vacuum gauges were still recovering for ~ another 2 minutes) and the voltage was quickly increased to 24kV reaching a current of 100uA. at 3:22 The current then fluxuated but trended up for the next 12 minutes peaking at a total current of 240uA. After this point the current started deceasing, at 3:41 the testing was concluded and the average current was ~170uA. The vacuum gauge readings were 1.6 x 10^-6 Diagnostics Box, 7.4 x 10^-7 Service Cap, 2.0 x 10^-6 Containment Box. It was deemed that this is "not ideal but good enough" to put the target on.  The maximum known required voltage will be ~22kV for Berillium which TM1 should be capable of providing.

Wednesday, October 14, 2014

 The BIAS voltage was brought up between 1:30pm and 5pm. Sparks tripped the BIAS power supply at voltages between 20 - 24 kV. Multiple attempts were made. The current was about 50-60 uA.

Wednesday, October 15, 2014

Temperature in the cooling circuit is too hight to do a HV test. The cooling circuit was started, but shuts off after ~10 m

Thursday, October 16, 2014

David and I found that the fans on the cooling unit on the roof did not run and that the compressors get hot and likely trip on over temperature protection (hot to the touch). We found the manual in the control panel of the unit.

10am: HV to 20kV before a spark tripped the PS. Current at 40 uA - resistivity at 11.9 Mohm

5pm: HV to 20kV before fluctuations in current, then a spark tripped the PS. Current around 40 uA. Resistivity 12.6 Mohm

Friday, October 17, 2014

8am: Staging did not start over night. TS5 temp is 31 deg C, which would have tripped power supplies. Reset and enabled staging.
The system increased staging until all 3 compressors were running.
9am: Cooling supply temperature reached ~3 deg C. Disabled staging and switched off all pumps
2pm: Switched off water circulation for the weekend.

No Source Tray installed. Loop on cooling circuit D. All other circuits blanked off.

Voltages stated below are set point voltages. These corresponds reasonably well with the local read backs on the power supplies. The read back voltages in EPICS are somewhat lower.

Wednesday, January 07, 2015, 09:16: 20 / 10 kV (BIAS / EL)

Wednesday, January 07, 2015, 09:20: Vacuum responses from BIAS 27 kV. Corresponds to each increase in bias voltage.

Wednesday, January 07, 2015, 09:40: 30 / 15 kV 

Wednesday, January 07, 2015, 10:28: Sparking and vacuum responses continues with every 100 V BIAS increase. If the voltage is lowered and brought back up, no sparks are observed; the module is conditioning.

Wednesday, January 07, 2015, 12:09: 34 / 17.5 kV

 Wednesday, January 07, 2015, 13:05: 35 / 17.5 kV

Wednesday, January 07, 2015, 14:50: 37.5 / 20 kV

Wednesday, January 07, 2015, 15:40: 38.5 / 20 kV

Wednesday, January 07, 2015, 16:02: BIAS and EL power supplies off.

Thursday, January 08, 2015, 10:00: HV condtioning continues

Thursday, January 08, 2015, 10:11: 35 / 20 kV

Thursday, January 08, 2015, 10:29: 38.5 / 20 kV

Thursday, January 08, 2015, 11:43: 40 / 20 kV

about 15 sparks per hour (5 / 20 min)

Thursday, January 08, 2015, 14:41: 42.5 / 22.5 kV

Thursday, January 08, 2015, 15:08: Communication lost with RGA. Could not be recovered.

Thursday, January 08, 2015, 15:58: 45 / 22.5 kV

Thursday, January 08, 2015, 16:27: BIAS and EL power supplies off.

Friday, January 09, 2015, 08:52: 45 / 22.5 kV

Tried to recover RGA by unplugging and plugging power cord, but no success.

Friday, January 09, 2015, 10:45: Increased sparking at 48 kV - reduced to 47.5 kV

Friday, January 09, 2015, 11:53 : 50 / 25 kV

Friday, January 09, 2015, 12:28: ~ 1 spark / minute for the last 10 min

 Friday, January 09, 2015, 15:27: ~25 sparks / hour for the last 20 min

Friday, January 09, 2015, 16:18: ~18 sparks / hour for the last 20 min

Monday, January 12, 2015, 09:31: 50 / 25 kV

Monday, January 12, 2015, 10:31: No sparks for 20 min after ~30 min of conditioning.

Monday, January 12, 2015, 12:24: BIAS / EL power supplies tripped on conductivity (spark)

Monday, January 12, 2015, 13:13: 55 / 27.5 kV

Monday, January 12, 2015, 14:32: 1 spark for the last 10 min

Monday, January 12, 2015, 15:38: 57 / 30 kV

Monday, January 12, 2015, 15:48: ~60 sparks / hour for the last 10 min

Monday, January 12, 2015, 16:00: BIAS and EL power supplies off.

Tuesday, January 13, 2015, 08:45: 55 / 27.5 kV

Tuesday, January 13, 2015, 09:18: ~60 sparks / hour for the last 10 min

Tuesday, January 13, 2015, 10:17: No sparks for the last 10 min

Tuesday, January 13, 2015, 10:30: 57.5 / 30 kV

Tuesday, January 13, 2015, 11:34: 59 / 30 kV

Tuesday, January 13, 2015, 13:23: No sparks for the last 25 min 

Tuesday, January 13, 2015, 14:11: 60 / 30 kV

Tuesday, January 13, 2015, 14:42: Spark tripped TP2 and TP1S and both power supplies

Tuesday, January 13, 2015, 15:02: 60 / 30 kV (local read back 60.5 / 30 kV, 0.1 / 0.15 mA)

Tuesday, January 13, 2015, 15:38: BIAS and EL power supplies off.

Wednesday, January 14, 2015, 08:34: 60 / 30 kV

Wednesday, January 14, 2015, 10:41: 3 sparks / hour for the last 60 min

Wednesday, January 14, 2015, 13:39: 61 / 30 kV

Wednesday, January 14, 2015, 14:29: 61.5 / 30 kV (local read back 62 / 30 kV, 0.1 / 0.15 mA)

Wednesday, January 14, 2015, 15:40: ~ 6 sparks / hour for the last 20 min

Wednesday, January 14, 2015, 16:07: TP2 found to be tripped off. Restarted.

Wednesday, January 14, 2015, 16:23: 60 sparks / hour for the last 20 min

Wednesday, January 14, 2015, 16:28: BIAS and EL power supplies off.

Thursday, January 15, 2015, 08:27: 60 / 30 kV

Thursday, January 15, 2015, 11:24: ~35 sparks / hour for the last 20 min

Thursday, January 15, 2015, 14:09: 12 sparks / hour for the last 60 min

Thursday, January 15, 2015, 15:33: 58 / 30 kV

Thursday, January 15, 2015, 15:49: 56 / 30 kV

Sparks observed both at 58 and 56 kV

Thursday, January 15, 2015, 15:57: BIAS and EL power supplies off.

Monday, January 19, 2015, 09:53: 55 / 30 kV

Monday, January 19, 2015, 11:44: ~20 sparks / hour for the last 20 min

Monday, January 19, 2015, 12:53: ~10 sparks / hour for the last 20 min 

Monday, January 19, 2015, 16:30: 50 / 30 kV

Monday, January 19, 2015, 17:31: BIAS and EL power supplies off.

Tuesday, January 20, 2015, 08:54: 40 / 20 kV

Tuesday, January 20, 2015, 09:05: 50 / 25 kV

Tuesday, January 20, 2015, 13:43: 8 sparks / hour for the last 60 min

Tuesday, January 20, 2015, 16:43: 3 sparks / hour for the last 60 min

Wednesday, January 21, 2015, 09:10: 40 / 20 kV

Wednesday, January 21, 2015, 09:20: No sparks

Wednesday, January 21, 2015, 09:23: 50 / 25 kV

Wednesday, January 21, 2015, 10:33: 3 sparks / hour for the last 60 min

Wednesday, January 21, 2015, 13:43: 6 sparks / hour for the last 60 min

Wednesday, January 21, 2015, 16:07: 5 sparks / hour for the last 60 min

Wednesday, January 21, 2015, 16:09: BIAS and EL power supplies off.

Thursday, January 22, 2015, 09:11: 40 / 20 kV

Thursday, January 22, 2015, 10:14: No sparks

Thursday, January 22, 2015, 10:16: 45 / 25 kV

Thursday, January 22, 2015, 11:26: No sparks

Thursday, January 22, 2015, 16:57: No sparks

Thursday, January 22, 2015, 16:57: BIAS and EL power supplies off.

Friday, January 23, 2015, 09:28: 40 / 20 kV

Friday, January 23, 2015, 09:39: No sparks

Friday, January 23, 2015, 09:40: 50 / 25 kV 

Friday, January 23, 2015, 16:16: No sparks.

Friday, January 23, 2015, 16:17: BIAS and EL power supplies off. 

Monday, January 26, 2015, 09:17: 40 / 20 kV

Monday, January 26, 2015, 09:29: No sparks

Monday, January 26, 2015, 09:30: 50 / 25 kV

Monday, January 26, 2015, 09:52: No sparks

Monday, January 26, 2015, 09:53: 55 / 27.5 kV

Monday, January 26, 2015, 16:55: No sparks for 7 hours. BIAS and EL power supplies off. 

Tuesday, January 27, 2015, 09:10: 40 / 20 kV

Tuesday, January 27, 2015, 09:16: 50 / 25 kV  

Tuesday, January 27, 2015, 09:31: 55 / 27.5 kV

Tuesday, January 27, 2015, 09:51: No Sparks

Tuesday, January 27, 2015, 09:53: 57.5 / 30 kV (one spark while increasing BIAS voltage)

Tuesday, January 27, 2015, 10:14: No sparks

Tuesday, January 27, 2015, 10:18: 58 / 30 kV. Some sparks

Tuesday, January 27, 2015, 10:46: 59 / 30 kV. Some sparks while increasing BIAS voltage

Tuesday, January 27, 2015, 11:43: 59.5 / 30 kV. Some sparks while increasing BIAS voltage

Tuesday, January 27, 2015, 13:24: Spark

Tuesday, January 27, 2015, 13:33: 11 sparks for the last 10 min

Tuesday, January 27, 2015, 13:33: 59 / 30 kV

Tuesday, January 27, 2015, 13:35: 57.5 / 30 kV 

Tuesday, January 27, 2015, 16:14: ~3 sparks / hour for the last 60 min

Tuesday, January 27, 2015, 16:53: ~3 sparks / hour for the last 60 min

Tuesday, January 27, 2015, 16:55: BIAS and EL power supplies off. 

Wednesday, January 28, 2015, 09:11: 40 / 20 kV

Wednesday, January 28, 2015, 09:17: 50 / 25 kV 

Wednesday, January 28, 2015, 09:27: 55 / 27.5 kV 

Wednesday, January 28, 2015, 10:35: 11 sparks observed. BIAS and EL off - preparing for power outage

 The silicon carbide targets voltage was raised to 42 kV today before continuous current draw was observed. It took roughly 10 minutes to raise the module to this voltage with only the occasional spark. The ION gauge reading was 2.0 x 10^-6 T, The service cap IMG 3.6 x 10^-6 T, and the secondary vacuum was 4.5 x 10^-6 T. Setup check and conditioning was performed by Pierre.

 TM1 was high voltage tested without a target on November 16, 2011 with Don Jackson, Pierre Bricault, and Bevan Moss. The module was able to hold up to 25 kV but between that and 32 kV there was lots of discharge which could be measured in the vacuum. See the attached plot for the voltage current and sparks.

The high active water resistivity took a long time to recover after the upgrade to the water cooling circuit. The system needed about a month (from end February to end March) to recover to nominal values. See attached plot of archiver data.

TM1 has now been connected in ITW and the water resistivity remains > 8 MOhm cm, which should allow normal operation. However, the resin is suspected to be approaching end of life. Work is ongoing to get a new replacement resin tank.

Using a long pole with a probe to spray helium on TCS vacuum seals and joints which are installed in  TCS service pit. No response has been found on leak detector during leak check. TCS is leak free.

Helium pressure test on TM4 HS line at TCS  is done.Leak detector 0.0X E-9atm.cc/sec.  5minutes, 70psi helium.    No response on LD.

70 psi helium ,2minutes to  TM4 HS line. LD base leak rate 0.0xE-9 atm.cc/sec. No leak.

70 psi helium , 2 minutes. Base leak rate 0.0x E-9 atm.cc/sec. base pressure 0.0XE-4 torr. no response on LD.The line is good.

I did helium pressure test on TM4 HS line at TCS this morning.  70psi helium 3 minutes, 0.0xE-9 atm.cc/sec base leak rate. No response. No leak.

The helium pressure test on TM4 HS line at conditioning station is done. No leak. I also leak checked all vacuum seals on TM4 service cap. They are all good.

I did the helium pressure test on TM4 HS line at CS. Applied 70 psi helium  2 minutes. base leak rate0.0x E-9 atm.cc/sec.  No response during the test. No leak.

Helium pressure test HS line at CS with 70 psi for 2 minutes. Base  leak rate 0.0xE-9atm.cc/sec. No response. The line is leak tight.

I did a helium pressure test on TM2 HS water line at TCS. Leak detector base leak rate only could get to 1.8x e-8 atm.cc/sec at this moment. Applied 5 minutes 70psi helium on it. No leak has been found at this level. I connected water to this circuit after the test for weekend TM2 conditioning at TCS.

I will do another helium pressure test after the conditioning. The LD base leak rate should be 0.0Xe-9 atm.cc/sec at that time.

2016-08-29: LD Base leak rate 0.0xe-9atm.cc/sec.TM2 HS line helium pressure check again after conditioning. 70psi helium 5minutes. no response on LD. HS line is perfectly sealed.

LD base LR 0.0xE-9 atm.cc/sec , 80 psi helium 2 minutes on HS and window circuits. No leak. Also, the reinstalled(after rewiring job) TP2 and PNG1(steers) side panel have been leak checked. No leak.

These two lines are passed helium pressure test this morning. The LD base leak rate 0.0 X E-9 atm.cc/sec. The base pressure 0.0 X E-4 torr. Helium pressure 70 psi. applied helium to both line for 5minutes each. No response on LD during the test.

  I did helium pressure test on TM2 containment box window and HS line at TCS. @ 70psi helium  for 3 minutes, HS:2.2XE-7 atm.cc/sec., Window:1.2XE-7 atm.cc/sec. There is no change on HS. But LR on window is bigger than before that was in E -9atm.cc/sec range.  

LD  BLR :0.0 X E-9 atm.cc/sec. BP:0.0XE-4 torr. helium 70 psi. 3 minutes on each circuit

There is a smallleak HS which we did not see before. The HS is checked in SHC  with helium spray yesterday. We did not see the leak . We checked this HS line every time when new target was installed. So mostly, this small leak is from VCRs connected to new target. But, we can not confirm it.  Still this line will be checked on next new target. We should have a better understanding when checking next time.  Other line are almost same as we checked in last year November. I did not see essential change.

The attachment can not be opened for some reasons. Please check TM2 leak check  2017-03-13 e- log for last time test result and comment.