ITW and TM2 primary and secondary vacuum vessel leak check is done. Leak detector is connected to ITW TP1. Base leak rate on leak detector is 0.0 x E-9 atm.cc/sec.   See attachment for the result.  No big issue. Two old leaks we found last year at location D and E disappeared in this check. We did Vacseal resin spray on them last year.  It looks like the Vacseal spray works .  From the result , I can see the o-ring between exit 1 module and T - flange is closing to the end of the life.  There are two small leaks on this o-ring now at A and B location. We plan to change this o-ring next winter shut down. We do vacseal spray on them this year. The big O-ring between tank vessel and T -flange looks still ok. Two small leaks are found on location F and G on this O-ring. Not much we can do on them. The leak on location C and B were sprayed with resin yesterday after leak check. They are leak free after spray on check. I will double check them. Leak on location A will be resin sprayed after TM2 is removed and ITW is under vacuum.   All TM2 internal water-cooling lines are helium pressurized (70 psi) for 5 minutes each. HS shows 2.5 X E-9atm.cc/sec leak rate. The rest lines are 0.0 X E-9 atm.cc/sec.

 TM2 with target UCx40 was disconnected in ITW and moved to NHC.

 TM2 with no target on SW silo be electrical checked right after module moving.

 TM2 with TiC#6 was checked on SHC, see pic attached pls.

TM2 HS line helium leak check is done. leak detector base LR 1.8xE-8atm.cc/sec.  helium pressure 70 psi. 5 minutes test. no change on LD leak rate.    I spray lots helium to gas line adaptor and fittings. No leak.has been found  at this base leak rate level.  Since the TCS MP1 has some  issue ,this time the base leak rate on LD only can get to 1.8Xe-8 atm.cc/sec at this moment instead of 0.0xE-9.  The low E-8  level is not perfect, but  i  have no concern on it.

TCS MP1 is replaced due to poor performance( system shows unstable and high reading on TCSCG1A and high TP1,TP2 current draw) . The pump is edward 15i scroll pump. Since vacuum group has no same spare pump, i have to use SMP roughing pump SMP:MP1 which is a  same pump to replace it.. After the replacement ,the TCS:CG1A and TP1, TP2 current draw are back to normal. The original TCSMP1 was surveyed. Swipes on intake and exhaust port are 300 counts and 1000counts. RAM contact field measurement are from 0.2 to 0.5 usv/hr. It is stored in TH. We will try to refurbish this pump first and use as for SMP:MP1. If we can not refurbish it, a new 15i pump will be purchased for SMP:MP1.

2023-05-31: Opened pump tip seal chamber and swiped chamber inside. The contamination level :1200 counts on 44-2.  The tip seal and tip seal chamber o ring need to be replaced . Checked gas ballast knob. The O-ring inside knob is in good condition. Checked exhaust port o-ring. it is in good condition. spare part PO will be issued soon.

2023-06-14:Tip seals and o-ring have been replaced on original TCS:MP1. After, it was tested at TCS for 48 hours. The pump is much quiet on operation, and the pump body temperature is mild. The final  inlet pressure this pump could get with TCS PV1 closed is about 23 mtorr.  The result is good. I installed it back to TCS vacuum station and reinstalled SMP:MP1 back to SMP vacuum station.  

 TM2 with TiC#6 was connected in ITW (FEBIAD), turbo pumps were started successfully.

 Gas lines pumped down at electric room for TM2 at ITW is done, leak rate 0.0e -8 <1.0e -3 T P pressure

Conditioned TM2 up to 48kV in ITW. Some sparks and current is not very stable. Drawing about 178uA at 48kV.

TM2 SiC#6 has been disconnected in ITW. See check list

TM2 TiC#6 post run electrical check has been done at TCS. See attachment

Nb#10 has been installed on TM2 . electrical and leak check on HS line are good. See attachment.

TM2 Nb#10 has been connect at TCS. TCS water system and vacuum system have been started. Everything looks ok so far. TCS Faraday cage is secured for TM2 conditioning at TCS.

PIE on TiC#6 was done in the NHC. The target assembly looked brand new when we took it out, no heating spots or deposits (pictures on docushare). Online we measured a 400kOhm connection between TGHT-TBHT-COIL to HV common (TGHT and COIL shorted in TM2 service tray) and anode was unstable above ~300V. After the module move and before the target removal David found TGHT-TBHT-COIL was a dead short to HV common and the anode was at 39kOhms to HV common.

1. Wanted to see if the TGHT-TBHT-COIL short was on the COIL. Measured with ohmmeter the COIL lines to HS and got about 700Ohms. But with the target lying down the COIL lines drop and touch the heat shield so to do this measurement Chad had to lift the lines, which could cause them to touch something else. So not sure how reliable this measurement was. It jumped around a lot, saw 0L occasionally.

2. Measured both target legs and tantalum gas line to HS, got about 5kOhms repeatedly using the ohmmeter.

3. Meggered across the gas line insulator to the gas line going into the target and got open circuit at 250V, so the gas line wasn't coated.

4. Target container looked vaguely red in the areas where the target material was, otherwise still no deposits on the inside. The container was not overly crystalized as seen on the legs and end caps.

5. Some sparking marks on the EE and some slightly asymmetric deposits

Continuing Aug. 22 2023:

6. Found what looks like a hole in the insulation on the COIL, maybe the cause of our short? Found a corresponding line mark on the copper plates that hold the coil down but not sure if it is related. Pics on docushare.

7. Grid looks perfectly new. Where was that current going?

8. Copper plates that hold coil were loose and bolts that hold coil in just fell out as well.

9. What can be seen of the anode wire looks good.

 TM2 with new target Nb#10 was moved to ITW from TCS and re-connected in pit. TPs are running at their full speed. 

 TM2 with target Nb#10 was disconnected in ITW yesterday for beam production issue investigation.

 TM2 with new target Nb#11 has been E/L checked sitting on NHC.

 TM2 with new target Nb#11 replaced has been electric checked one more time in ITW.

 Module was connected yesterday and all turbo pumps are running at their top speed. 

 TM2 with target Nb#11 has been disconneted in ITW. The HS line was purged with Nitrogen in station.