TM4 with spent target UCx#43 was disconnected in ITE and is ready moved to SHC. see attachment pls.

Tm4 waterlines helium pressure test and TM service cap helium leak check was done last Friday. All water lines were pressurized with 70psi helium for 3 minutes each. The 3 minutes stable leak rate on all lines are less than 4.0 X E-9atm.cc/sec. some of lines had surging leak rate to 2xE-8 atm.cc/sec at the first 10 seconds of pressurization which should be a gas hammer result at the beginning. Based on the numbers, I would say all water lines are leak free still.  I did helium spray on TM4 service cap. There could be a small leak in high E-9 atm. cc/sec on ion gauge and steer service panel o-ring.  I will replace this o-ring when module is moved out of ITE. Other seals are leak free or less than 2.5X E-9 atm.cc/sec leak rate which are good. I am pretty confirm there is a small leak on ITE entrance module top. The leak rate and location will be confirmed when the rest of leak checks in ITE pit are done.

Entrance module has been connected in ITW pit per document 190510 " entrance module disconnection and removal procedure".

ITW entrance module has been moved from SHC to ITW. A slightly bump on module shielding block bottom side corner to tank vessel side when lowed module into tank. No big concern on this slight  bumping. Otherwise the move is perfect.

On Jan. 9 we did the PIE on Ta#66. Opened the heat shield and removed the EE. The inside of the heat shield was very black with lots of flakes falling off. The target itself looked overheated, and the container looked pretty bad for a Ta target. The outside of the EE looked perfect but after removing it there was a lot of black stuff on the side and we saw that the Re foil was curled up. Jens said during the runtime that he saw something that looked like a wire in the beam path, so maybe this was it.

Ta#66 post operation electrical check was done at SHC this Monday. See attachment.

ITW entrance module has been moved from ITW to SHC. The move is smooth.  I cleaned entrance module tank flange and o r-ing slot.  entrance module tank flange o ring  is replaced .

ITW entrance module has been disconnected per document190510. It will be moved to SHC for diagnostic group tomorrow.

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.   

 To deliver stable beam to RadMol, started heating UCx#43 up again. Target was overheated during initial conditioning in Nov but then ran well for 4 weeks. During the run time, the TGHT voltage jumped around and this was reflected in the ion current, but yields seemed unaffected.

When re-heating it, the TGHT voltage was very unstable and once it got to 440A, it went into voltage limiting mode. We ramped down and it was still voltage limiting, but turning things off solved it. We ramped back up and it did about the same thing. TBHT voltage and current remained steady. Looks like a heat generated issue.

Measured the resistance in the lines from the electrical room. Resistance of the lines to ITE should be 1.19mOhms for TGHT and 1.95mOhms for TBHT. TBHT positive to negative had a resistance of 7.9mOhms from the electrical room today, and 5.7mOhms on module top when measured Nov. 8. This seems to track.

TGHT positive to negative was measured at 27.6mOhms today (and was jumping around), whereas it was 7.14m Ohms on Nov. 8.

10V @ 440A is 22.7mOhms, so it makes sense that it limited. Tried with increased voltage (up to limit of 16V) but this didn't help. Declared the target dead on Jan. 11.

David measured resistances on the module top and found (in mOhms):

A-B = 27 (TGHT)

A-C = 7.473

A-D = 6.380

B-C = 26.053

B-D = 25.569

C-D = 5.212 (TBHT)

So looks like the tube is broken on the B side.

 The spent Ta#66 was moved from the south hot cell to the spent target vault, it was placed in pail#285 and placed in spot 5B of the vault. The target was 46.2mSv/hr when removed from the south hot cell. See the attached PDF for vault details.

TM2 was moved with no target attached from the South Hot Cell to a silo.

TM2 was moved from ITW to the South Hot Cell with Ta#66 target.

ITW primary and secondary vacuum vessel leak check and TM2 water lines helium pressure test are done today. No major concern. see attachment for small air to vacuum leak we found.  TM2 water lines helium pressure test is fine.   HS and window line leak rate are 1.4Xe-8 atm.cc/sec. all other water lines are below 3.0XE-9atm.cc/sec.

TM2 has been disconnected in ITW. All water lines are nitrogen purged. Filled 60 psi argon to all Tm2 water lines for module storage in winter shut down.

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

Pail 211 which contained Ta#58 spent target was repackaged into Pail 286 in the South Hot Cell.

The dose rate at approx. 1 m was 4.16 mSv/h.

Pail 286 was transferred to the mini-storage vault and placed in the outermost location. The mini-storage vault is full at this time, in preparation for the next shipment.

TM3 was moved from the SHC to the TCS (no target installed).

TM3 has been moved from the target conditioning station to the south hot cell.