Preparation on TM2 move from TCS to SHC.

 TM#2 with no source tray has been moved from the south hot cell to the conditioning station.

BIAS and EZL connected. No water flowing into the module (water looped on top of module)

Friday, March 01, 2019, 08:20: 10kV

Friday, March 01, 2019, 08:40: 20kV

Friday, March 01, 2019, 08:57: 30kV

Friday, March 01, 2019, 11:00: 40kV

Friday, March 01, 2019, 15:23: 50kV

Monday, March 04, 2019, 08:50: 50kV

Monday, March 04, 2019, 09:22: 52.5kV

Monday, March 04, 2019, 10:01: Spark tripped TPs at 54kV

Monday, March 04, 2019, 10:04: 50kV

Monday, March 04, 2019, 10:14: Multiple sparks at 54kV. Lowered to 30kV to stop.

Monday, March 04, 2019, 10:15: 40kV

Monday, March 04, 2019, 10:16: Sparking at 42kV. Lowered to 40kV

Monday, March 04, 2019, 10:19: 42kV

Monday, March 04, 2019, 10:48: 50kV

Monday, March 04, 2019, 11:11: 52.5kV

Monday, March 04, 2019, 11:25: 54kV

Monday, March 04, 2019, 11:50: 55kV

Monday, March 04, 2019, 13:33: 3 sparks observed for the last 1.5h

Removed HV cover to avoid sparking between F/T and cover.

Monday, March 04, 2019, 14:02:20kV

Monday, March 04, 2019, 14:06: 50kV

 Monday, March 04, 2019, 14:12: 55kV

Monday, March 04, 2019, 14:20: Multiple sparks at 56kV. Lowered to 30kV to stop.

Monday, March 04, 2019, 14:27: 40kV

Monday, March 04, 2019, 14:29: 50kV

Monday, March 04, 2019, 14:32: 55kV

Monday, March 04, 2019, 14:40: 56kV

Monday, March 04, 2019, 14:55: Multiple sparks at 57kV. Lowered to 30kV to stop

Monday, March 04, 2019, 15:01: 55kV

Monday, March 04, 2019, 15:36: 57kV

Monday, March 04, 2019, 15:51: 57.5kV

Monday, March 04, 2019, 16:30: ~1 spark in 0.5h, somewhat unstable current (see attached Word file)

Monday, March 04, 2019, 16:30: HV off

Spark between HV cover vertical mesh plate and HS 60KV  bias connecting clamp 90degree angle at 55 KV on TM2 top. HV cover is removed to test above  55KV. The spark triggered TH and SHC ventilation secondary alarm.

TM2 has been moved from TCS to SHC. The move is smooth.

 TM#2 has been moved from the south hot cell to the conditioning station.

New seals with a blank off cap are installed on TM2 window line water block.   The seals are checked at TCS with 70 psi helium for 5 minutes with LD at 0.0xE-9atm/cc.sec. No response on LD during test. Seals are good.

 The TCS will be vented soon for TM2 move.

 TM#2 with a new source tray and the dummy target has been moved from the south hot cell to the conditioning station.

 Electrical Check of TM#2 with the dummy target attached.

Helium pressure test on TM2 all water circuits is done. 70 psi helium , 10 minutes test time. Leak detector :base leak rate 0.0XE-9 atm.cc/sec, base pressure 0.0Xe-4torr. No any response on LD during the test. All TM2 water circuit are leak free.

David Wang wrote:

Helium pressure test on TM2 all water circuits is done. 70 psi helium , 10 minutes test time. Leak detector :base leak rate 0.0XE-9 atm.cc/sec, base pressure 0.0Xe-4torr. No any response on LD during the test. All TM2 water circuit are leak free.

 Thursday, March 28, 2019, 12:40: Found valve to expansion tank TCS:TK2 to be closed. Opened valve. This allow air to escape out of the system and the water system is running as expected again

Friday, March 29, 2019, 11:15: Changed EE to conditioning mode

Friday, March 29, 2019, 11:35: BIAS / EZL 20 / 10 kV

Friday, March 29, 2019, 13:47: BIAS / EZL: 25 / 12.5 kV

Friday, March 29, 2019, 16:09: BIAS / EZL: 30  / 15 kV

Friday, March 29, 2019, 17:23: No sparks for >60 min

Friday, March 29, 2019, 17:26: BIAS / EZL off

Monday, April 01, 2019, 08:13: BIAS / EZL: 30  / 15 kV

Monday, April 01, 2019, 08:33 BIAS / EZL: 35  / 17.5 kV

Monday, April 01, 2019, 09:00: Sparking at about 37.5 kV BIAS. Lowered below 20 kV to stop. Now sparking at around 20 kV

Monday, April 01, 2019, 10:00: BIAS/EZL 22 / 20 kV. Occasional sparking on BIAS as voltage is increased.

Monday, April 01, 2019, 10:05: Change of strategy. Will heat target to bake out the vacuum before continuing with HV conditioning.

Monday, April 01, 2019, 10:43:

BIAS / EZL / EE: 15 / 7.5 / 1.5 kV
COIL / ANODE: 10 A / 200 V
Ramping TGHT / TBHT at 1 A/min. Good/bad vacuum (IG2): 1E-6 / 2E-6 Torr

Monday, April 01, 2019, 19:16: TGHT / TBHT: 500 / 270 A. Vacuum increasing. IG1/2 1.2E-7 / 1.4E-6 Torr

Monday, April 08, 2019, 09:28: BIAS / EZL: 20 / 10 kV (some periods of multiple sparks)

Monday, April 08, 2019, 10:28: BIAS / EZL: 30 / 15 kV (some periods of multiple sparks)

Monday, April 08, 2019, 11:24: 3 sparks for the last 60 min

Monday, April 08, 2019, 14:43: BIAS / EZ: 40 / 20 kV (after two periods of sparking around 39 kV requiring voltage to be reduced below 30 kV to recover)

Monday, April 08, 2019, 15:57: Two sparks in 70 min

Tuesday, April 09, 2019, 12:40: BIAS / EZL 40 / 20 kV with >90 min without sparking

Tuesday, April 09, 2019, 16:00: BIAS / EZL 48 / 24 kV

Tuesday, April 09, 2019, 16:07: Sparking tripped TPs and IG1S, then power supplies.

Tuesday, April 16, 2019, 16:41: BIAS / EZL 50 / 25 kV for 1 hour without sparking.

Wednesday, April 17, 2019, 15:23 : Continued without problems to 50 kV earlier, but sparks tripped off vacuum just above 50kV. Continue later.

 TM#1 has been moved from the north west silo to the conditioning station for the day it will be moved back to the silo tomorrow morning.

TM1 shielding plates and their holding bolts are inspected. No corrosion.  TM1 is located at TCS now. Both TP1 and TP2 are started.

 TM#4 has been moved from the south hot cell to the conditioning station.

TM4 has been connected at TCS for HV test. TCS water system and vacuum pumps are switched on.

TM4 in conditioning station with no source tray, extraction electrode set to HV bias. Brought up to 30kV over the weekend by ISAC ops with no issues.

BIAS=30kV

EL=15kV

IG1=9.4e-7T

Monday, June 10, 2019, 08:21 : At 32.4kV on bias, EL at 15kV, bias sparked to EL. Every bump of 100V on bias is accompanied by a small vacuum jump and often by a small current increase from ~60uA to 120uA.

* Conditioning station read back and set values are off by 2kV but archive values show this has always been the case. Which to trust? *

Monday, June 10, 2019, 08:54 : Spark while sitting at 38kV on bias, 19kV on EL. Seems to be a spark to EL.  Sitting at 38kV for ~10mins

Monday, June 10, 2019, 09:32 : Sat at 40kV for ~10mins or so, bumping up again.

Monday, June 10, 2019, 09:38 : Spark to EL while sitting at BIAS / EL = 42kV / 20.5kV

Monday, June 10, 2019, 13:57 : Ramped to BIAS / EL = 43 / 21.2. No problems other than what seems to be the usual conditioning station stuff.

 Monday, June 10, 2019, 14:17  : Couple sparks on the way to 48kV, seems to be to the EL.

Monday, June 10, 2019, 14:36 : Up to BIAS/EL = 51/25.5 with no big problems. Will stay here for a couple mins

Ramped down the bias so David could remove the HV cover and lock out the target hall.

Ramped back up to BIAS / EL = 50kV / 26kV quickly with no sparks.

Monday, June 10, 2019, 15:35 : BIAS / EL = 52kV / 26kV

Monday, June 10, 2019, 15:45 : BIAS / EL = 54kV / 28.5kV. It seems that keeping the EL at 1/2 the bias voltage is right on the edge of what is acceptable - the HV seems to be sparking to the EL instead of to ground (either that or the EM interference from the sparks it producing a reaction in the EL...) I will run the EL higher and see if that helps.

Monday, June 10, 2019, 15:57 : Sat at 54kV for > 10mins, will continue up

Monday, June 10, 2019, 16:11 : At BIAS / EL = 55.8kV / 29kV got some sparks, some to EL and some to ground. Back at 55kV.

Monday, June 10, 2019, 16:24 : Sitting at 56kV for a couple mins

Monday, June 10, 2019, 16:37 : Sitting at 56.3kV bias, a spark tripped off the IG1S, which tripped the turbo and shut down all the HV. Back to zero!

Monday, June 10, 2019, 16:59 : TM4 back up to BIAS / EL = 56.1kV / 29.5kV

Monday, June 10, 2019, 17:14 : After 57kV on the bias, things seem to be getting sketchy. The EL voltage and current are a bit jumpy and stepping that voltage up seems to produce a slight spike in the bias current.

Monday, June 10, 2019, 17:31 : At BIAS / EL = 58 / 30.3, looks ok.

Monday, June 10, 2019, 18:11 : Sitting at 59.5kV, could probably push further but will sit here for ~30mins and make sure it is relatively stable. Note 59.5kV set point is really 56.9kV on readout.

Monday, June 10, 2019, 18:18 : some current inconsistencies (not really sparks probably corona discharges...) so went down to 59kV

Monday, June 10, 2019, 18:23 : still getting some sparks at 58kV, going down to 57.5.

Monday, June 10, 2019, 18:37 : went back up to 58, spent 10 mins there but was getting these corona-discharge-type-sparks where the vacuum responds and current is drawn but voltage is maintained. Went down to 57kV, still getting them....

Monday, June 10, 2019, 18:40 : Going down to 56 to see if they stop....

Monday, June 10, 2019, 18:42 : Trying 55 kV now... see attached screenshot for example of sparks

Monday, June 10, 2019, 18:48 : No luck at 55 or 54kV. Going down to BIAS / EL = 50 / 27 for a while to see if this resolves

Monday, June 10, 2019, 19:20 : 30 mins at 50kV, a couple little sparks, but no big deal. Ramping up to 55 and let's see if it is ok.

Monday, June 10, 2019, 19:30 : 55 still not working, going down to 54

Monday, June 10, 2019, 20:16 : Held bias at 54kV for about an hour - dropped it down once to alleviate some sparking. Leaving it at 50kV overnight, ops have instructions to keep an eye on it and shut it off if anything seems strange.

The conditioning station was ramped down overnight and David ramped it back up this morning. Currently trying to get it to sit stable at something higher than 55kV.

Wednesday, June 12, 2019, 08:11 : Sitting at BIAS / EL = 53.9 / 28, 2 sparks to ground, one turned off TP2

Wednesday, June 12, 2019, 08:53 : Been at BIAS / EL = 56 / 28 for >10mins with no real sparks. Will continue up.

Wednesday, June 12, 2019, 08:54 : Spark to EL at 56.1

Wednesday, June 12, 2019, 09:34: Sitting at 55kV for 40 mins. 2 sparks to ground, 1 spark to the EL.

Wednesday, June 12, 2019, 09:49 : Leaving it at 56.6 for a while

Wednesday, June 12, 2019, 09:56 : Either there was a spark to IG1S or there is a vacuum limit that does not accept a 1.2e-6T spike. Everything turned off, but everything seems to still be working.