Chad installed containment box back to TM2 yesterday. We leak checked VCR joints on window line.    No leak.

TM2 UCX33# electrical check and leak check results. See attachment.

Leak checked TM2 service cap at TCS. helium pressure checked containment box window and HS cooling lines.  No leak on service cap and waterlines.

TM2 has been connected it ITW.  All turbo pumps are started.

The job is done with Matt at NHC. All TGHT and TBHT bolts are torque wrench tight in NHC. HS leak check result is good.

helium pressurized HS line at TCS. No leak.

 TM#2 with UC#34 has been moved from ITW to the north hot cell had the target removed and then moved to the south west silo.

 TM#2 with C#3 has been moved from the north hot cell to ITW. Also for the up coming site wide power outage, the ISAC Target Hall crane has been turned off and powered down, also the remote crane console has also been power down as well so that mean no ISAC TV for a few days.

 TM2 been connected with new target C#3 in ITW. 

 the test was done when TM2 sit on NHC.

 the module TM2 with target C#3 was disconnected at ITW and is being remoted moving to SHC.

TM#2 was moved from ITW to SHC, then moved back to ITW.

 An electrical check of TM2 with target UC#36 and no external connections was finished at SHC. 

 TM2 with target UC#36 was connected at ITW.

 electrical checked in ITW

Frank and I finished ITW and TM2 leak check. TM2 internal water-cooling lines are leak free. They passed 70 psi helium pressure test. We found some small leaks on ITW primary and secondary vacuum vessel. I list them here:

1. Exit module 2 service cap top plate to cap body O-ring at SW corner. Leak rate 2XE-8 atm.cc/sec. It is an old leak we found before. Solution: I sprayed high vacuum resin to leak area. It is improved to 3Xe-9atm/sec now. We can leave it there.

2. Exit module 1 module to tank flange o-ring at target module side and north side. Leak rate 3XE-8atm.cc/sec. Solution: replace the o-ring. It involves in disconnect exit module 1 and remove it out. We may or may not change it. Let's check the schedule and discuss it later. We need Travis help on module moving out.
   
3. Exit module 1 north side sqaure service panel o-ring. Leak rate 2XE-7 atm.cc/sec.  Solution: replace the o-ring. It is a straight forward job.  It will be done this shut down.
   
4. Exit module 1 north side round roughing valve panel o-ring. Leak rate 8XE-9 atm.cc/sec. Solution: Replace the o-ring. It involves in disconnecting and removing ITW RV4.  It could be done this shut down.
   
5. Big T tank o-ring seal underneath the flange at exit 1 module north side . Leak rate 3XE-8 atm.cc/sec. Solution: None. All modules and module base flange have to been moved out to replace this big o-ring.  It is a huge project to change this o-ring .  I checked this big o-ring seal every year. It is first time a small leak is found.  Maybe, we could try high vacuum resin spray first.
6. Dump module flange o-ring at the side by Target module. Leak rate 8XE-9 atm.cc/sec. It cannot be confirmed since the TM o-ring is just beside it. Mostly, the leak is on dump module side. We changed TM flange o-ring every year. But we never changed dump module flange o-ring in history. Many copper cooling lines above the dump module has to be removed to remove the dump module out. I do not think we have time to do it this year. Also,  the leak rate is pretty small. Maybe, we can schedule it next year.

  Most these small leaks are close to turbopumps. This could be the reason the ITW vacuum on gauges are still pretty good.

Travis and Nadia moved TM2 from ITW to NHC this morning. The move is smooth and successful.

TM2( no target ) has been moved  from NHC to SMP.  The moving is smooth and successful.

 An electric check was done right after module moving from SMP to SHC. 

TM2 is in the TCS without containment box for HV testing following the installation of the IGLIS wiring.

Not great results so far - sat at 42.5kV for nearly 2 hours, current around 200uA and occasional sparks. I did not have time to go higher, will do this tomorrow. The sparks could be conditioning but it looks a bit suspicious to me. We will see if the ramp up tomorrow is very easy and how high we can go. I have data from HV testing of TM2 in December for comparison.

The EZL was reacting to all sparks, so I went into the target hall to see if it was sparking on the module top, but there was no sparking there.

Possible mitigations:

1. Re-do the connections on top of the service cap to remove the extra length on the wires inside the service cap and inspect the routing carefully to make sure nothing is in the wron place.
2. Inspect the wiring in the source tray to see if there is evidence of sparking in a certain area.

Second round of testing Tuesday April 5 2022:

Much better results, seems most of the sparking was conditioning. Went right up to 42.5kV with no issues. Spent quite a while getting up to 50kV, and didn't leave it there for more than a couple mins. May be running into the limitations of the HV cage at this point. Bias current was much lower, something like 140uA at 45kV.

Third round of testing Wednesday April 6 2022:

Ramped easily back to 45kV, a little more sparking above that. Sat at 47kV for ~30mins with no sparks. Won't try to go higher in case of issues with the cage. Will try to condition up to 50kV in the station. Other than the possible low megger value between B and C, all looks good.

Chad changed the EZL cable and plugs on TM2. New cable runs along the cable trays.