Tuesday, January 02, 2024, 15:58 :

Started HV ramp up on TM3 service tray about 3pm today. Had to bypass TCS:BIAS interlocks to make it work - there are some flow restrictions on the water lines that are causing the flow interlock to periodically trigger. The water flow it not very important for this test as long as the water is moving. Turned out that it was also conveninent to have all the interlocks bypassed because sparks tripped off the IG1 gauge and this did not cause the HV bias supply to turn off. Should use same setup next time.

Some sparking around 35-44kV, tripped off turbos/IG1/IG1S 3 times and so decided to ramp down.

Tried again while standing outside TH door to hear if sparking is outside the vacuum. Went to 48kV very slowy with multiple trips of the turbos, mostly TP2. Lots of sparks but easy to ramp back up to previous high point, so likely just a painful conditioning process. Current draw 167uA at 48kV. No sparks audible outside door, and vacuum response looks too large to be electrical noise.

Continued on Wednesday January 03 - went up to 53kV in the same way as before, lots of TP2 trips making its current a bit unstable... data was dumped as TM3_servicetray_conditioning_jan32023. Tried limiting the current on the power supply to very near the drain current to see if that reduces the number of trips. Didn't notice a significant effect.

Thursday, January 04, 2024, 09:57 :

Restarting conditioning, starting at 180uA at 53kV. Got up to around 60kV with many trips of the turbos, and one restart of the IG1 controller needed. Added a grounding hook to the vacuum controller rack to see if that helps reduce the trips. (doesnt appear to have).

Friday, January 05, 2024, 09:51 :

Continuing conditioning. Starting by sitting at 50kV for 10mins. No sparks observed during this time.

Even though we got to 60kV last time, onset of conditioning started at 58.6kV with a trip at 58.9kV... got up to 70kV.

Got to 72kV on Monday January 08 2024.

On Monday Jan. 15, tried to improve the grounding on the vacuum services rack to reduce sparking through the turbo controllers. Added two welding cables from the vacuum rack ground busbar to the copper grounding strip on the ground. If the spark is travelling from the faraday cage to the rack through conduit or grounding cables, maybe this will help. If it is coming through the turbo cable then it likely won't. Tried to add grounding straps on the turbo controller chassis (there is a brass screw which I think is for this purpose) but couldn't get either of the screws out with any resonable force. They undo a bit then get stuck...

 Wednesday, January 17, 2024, 20:39:

David vented TM3 with N, then opened the service cap to install new insulators. We pumped back down and Alexander and I ramped back up today - instabilities started around 55kV and we were back to slow conditioning in the high 50s. Got up to a set point of 65kV. Ray did some work on the TCS bias supply and now neither the set point or readback is correct. The PSU was reading 51.5kV at set point 50kV and 60kV at set point 58kV. Will continue later...

Wednesday, January 31, 2024, 16:23

Ramped up again, some slight instabiities around 56kV but could still go up pretty quick until about 65kV. Since Ray's testing of the TCS:BIAS supply both the readback and the set point are off from the powersupply display. Ran out of time and ramped down at set point 70.5.

Tuesday, February 06, 2024, 14:47

Testing again after venting the module with air. First tiny spark at 48, then some vacuum reactions starting at 49 but still no issues. Bit more reactive around 53.

 stopped at 69.4

Wednesday, February 07, 2024, 15:28 :

Ramped easily to 60kV set point and let it sit there. Didn't spark at all then after 100mins, sparked TP2 off. Otherwise first sparking happened at set point 67.

Found at limit at around 72.5 on the PSU front output, set point 70.6. think it comes from EPICS. Will have to test the power supply.... stopped there.

Thursday, February 08, 2024, 15:03 :

Long term testing. ramped back up, first spark at set point 65.

Let it sit for 2hrs 20mins. Something like 6 sparks during this time. Current also dropped significantly from 0.32A to 0.27A.

EDIT 2024-11-25, Alexander Shkuratoff:

All the StripTool data related to the above tests are on the server as the following below. Those without "Alexander" in the name were dumped by Carla.

	TM3_servicetray_conditioning_Jan32023	2024-01-03 17:29	807K
	20240103_TM3_Service_Tray_TCS_Alexander	2024-01-03 17:31	1.2M
	20240104_TM3_Service_Tray_TCS_Alexander	2024-01-04 16:58	238K
	20240104_TM3_Service_Tray_TCS_Alexander_2.csv	2024-01-05 07:00	13M
	20240104_TM3_Service_Tray_TCS_Alexander_1sec.csv	2024-01-05 12:21	81
	20240105_TM3_Service_Tray_TCS_Alexander.csv	2024-01-05 16:51	13M
	20240105_TM3_Service_Tray_TCS_Alexander_1sec.csv	2024-01-05 16:52	2.7M
	TM3_servicetray_conditioning_Jan52023	2024-01-05 21:24	8.8M
	20240108_TM3_Service_Tray_TCS_Alexander_1sec.csv	2024-01-08 16:56	4.7M
	20240108_TM3_Service_Tray_TCS_Alexander.csv	2024-01-08 16:56	7.1M

	TM3_servicetray_conditioning_Jan172024	2024-01-17 13:29	257K
	20240117_TM3_Service_Tray_TCS_Alexander.csv	2024-01-17 20:11	4.0M

	TM3_servicetray_conditioning_Jan312024	2024-01-31 17:24	2.2M
	20240131TM3_Service_Tray_TCS_Alexander.csv	2024-01-31 17:55	4.5M
	20240206_TM3_Service_Tray_TCS_Alexander.csv	2024-02-06 17:58	2.6M
	TM3_servicetray_conditioning_Feb62024	2024-02-06 19:29	4.6M
	TM3_servicetray_conditioning_Feb82024	2024-02-08 17:55	3.1M

 And the StripTool settings:

Alexander_TCS_HV_Conditioning.stp

2024-01-17 19:57

3.7K

David Wang and I did the service cap inspection in target hall: see WP I2015-10-06-10.<br>

Signs of sparking were seen underneath 3 insulators: E ("Cavity"), A ("Oven+") and B ("Oven -") at the pair water lines coming out of the  feed-through and going to the HV chase. Specifically one water line of E is very close to the feed-through insulator (2-3mm gap) and here the sparking sings are more prominent: see picture.

After Tm3 service tray and service cap installation, TM3 service cap air to vacuum seals leak check has been done at TCS. TCS:IG1 and IG1S are at low E-7 torr range.  leak detector base  0.0XE-9 atm.cc/sec,  base pressure0.0X E-4 torr.  I sprayed helium to all new air to vacuum seals on service cap. No leak on seals. The leak check has been repeated  2 times with same result.   

Service tray side of the waterblock jig is installed and all locking tabs enagaed save the heat shield circuit. Locking tab for heat shield circuit with be worked on Monday morning and installation of the source tray side of the waterblock jig should commence on monday as well.

The heat shield circuit blank offs have been re-installed and front cover replaced. TM3 is ready to move to the conditioning station for testing.

containment box was re-installed onto TM3 on Monday, Left manipulator may be showing signs of eminent handle or tong cable failure.

TM3 new source tray was transferred into SHC on this Tuesday. one hook arm of transfer jig is very close to optic tray tube when engaging the jig on transfer frame. tube side hook arm should go east side a little bit further to avoid the tube.  Also the HS tube top lines to  transfer frame beam bottom distance needs to be watched closely when hooking on the frame.Help from HC window is necessary. By watching on this details, Source tray are successfully moved into SHC with crane controlled locally in TH.Transfer frame was retrieved back to TH. It was cleaned, bagged and stored in TH.

Target Module 3 with no target, and a partially-installed Rev-3 source tray (no steerers connected, no IMG connected, entrance window lines blanked off on module side and not connected to containment box) was transported successfully to the Conditioning Station by Travis Cave and David Wang at around 4pm today.  David attached the vacuum system for start of pump-down to prepare for leak checking.

TM3 was moved from silo to SHC with no target. Move successful.

TM3 was moved with UCx#47 from TCS to ITE. The move was smooth.

TM3 was moved from SHC to TCS with UCx#47. The move was smooth.

The water block sealing surfaces on the module-side of TM3 were polished this week by Chad Fisher, using his air-ratchet controlled rotating head tools (single and double-surface polishing tools).

Photos of the polishing tools in-use are attached (from August 16 - 21, 2013)

Scotch-brite pads were used, followed by 2000 grit sandpaper, then white felt with isopropanol, then lint-free dry polishing pads, each on detachable heads that are used with the polishing tool.

The module-side water block surfaces were inspected by Grant Minor on 21 Aug 2013 using a level telescope and camera looking through the hot cell window.  Results can be viewed here, with photos indicating which block is being viewed in sequence.

https://documents.triumf.ca/docushare/dsweb/View/Collection-11251

TM3 module top helium spray leak test was done yesterday.  No leak on TM3 module top @ LD base leak rate 0.0 x E-9 atm.cc/sec.

TM3 has been moved from the south hot cell to the conditioning station. David and I completed the move. All went well.

Leak checked TM3 without source tray in CS this morning. The CS and TM3 vacuum: IG1(top of the TM3 service cap)4.9x E-7Torr, IG2(diagnostic box  primary)1.9XE-6 Torr. IG1S (secondary vessel)7.9X E-7Torr. The leak detector was at 0.0XE-4 torr and 0.0XE-9 atm.cc/sec level during the leak checked. All water lines quick connector fittings, NPT thread fittings, water cap seals, blue insulator seals, bellow, gauges seals, turbo-pumps, all blanket panels,and TM3 to CS vessel seal have been sprayed with helium and leak checked. No leak has been found. The TM3 is leak tight in CS.

A huge leak had been found on HS circuit during 60 psi helium pressurize test. Other circuits are free of obvious major leak at present .We will test them again once the TM3 is back to CS. See attachment for details

 TM3 is disconnected at TCS and ready to be moved to silo.

water loops are by passed on top. All bias, EE, and  EL are tied together. Started water system.

 To confirm that the sparking was coming from the module rather than the conditioning station TM3 was grounded and the conditioning station biased. Attached are the results. Highlights include that there was no sparking and the station was able to achieve 60kV (limited by controls from going higher). The current from the raw file has been corrected by the required factor of 5.

TM3 helium pressure test and electrical check with new source tray at TCS were done yesterday. The results are excellent. See attachment