ITE entrance module has been moved from TCS to ITE. The move is smooth.

ITE entrance module has been moved from ITE pit to TCS. The move is smooth.ITE entrance module top tank flange and o ring slot are cleaned, and old o ring are replaced.

ITE entrance module has been disconnected per document 190510. Its a preparation job for next month module moving out to SHC.

ITE entrance module flange seal had been replaced yesterday.The flange and the seal groove were cleaned with Acetone before the new seal is installed. See pictures

It is closed @ 2:35PM by closing supply side valve first , the return side valve of ITE dump plug .

Opened ITE dump plug circuit valves @4:28PM. ITE IG1S still at 1XE-6. No change before and after of circuit closing and reopeneing.

ITE clean up is done.  HV cage inside is wiped.

Eric and I finished ITE annual water interlock check. Everything works properly.

Helium pressure test on all water lines: 70psi , 3 minutes. HS has a quick response to 9Xe-9atm.cc/sec for 20 seconds. No response on other lines. All water lines are good. Air to vacuum  leack check on ITE and TM4: TM4 IG1 / Steers side panel has a low E-6 atm.cc/sec leak. The o-ring need to be changed when TM4 is located at TCS. All other air to vacuum seals are good on both primary and secondary vacuum vessel.

ITE was set up for HV tests - this time the module plug was not in so the BIAS and EE had to be bypassed. NOTE: ITE:BIASPLC must also be bypassed for this to work. Currently it is located on the vacuum bypasses page, but may be changed to the optics page soon.

ITE was ramped to 60kV in steps of 1kV easily. It sat at 60 for about 1.5 hours with a current draw around 173uA. It was not entirely stable though, and appears to have sparked many times. None of them seemed very large, but hard to tell.

When ramping down, current dropped quickly with the first couple steps. Data saved as isac/data/ITE_HVtesting_shutdown2024

Frank and I finished ITE and TM4 primary and secondary  vacuum vessel  leak check.　ＬＤ　ｂｅａｓｅ　ｌｅａｋ　ｒａｔｅ　０.０ｘ－９ａｔｍ．ｃｃ／ｓｅｃ．　Ｎｏ　ｌｅａｋ　ｈａｓ　ｂｅｅｎ　ｆｏｕｎｄ．Ａｌｓｏ，　Ａｌｌ　ＴＭ４　ｗａｔｅｒ　ｌｉｎｅｓ　　ｈａｖｅ　ｂｅｅｎ　ｐｒｅｓｓｕｒｉｚｅｄ　ｗｉｔｈ　７０ｐｓｉ　ｈｅｌｉｕｍ　ｆｒｏ　３　ｍｉｎｕｔｅｓ　ｏｎ　ｅａｃｈ　ｃｉｒｃｕｉｔ．　Ａｌｌ　ｗａｔｅｒ　ｌｉｎｅｓ　ｉｎ　ＴＭ４　ａｒｅ　ｇｏｏｄ．　Ｎｏ　ｒｅｓｏｐｎｅ　ｏｎ　ＬＤ　ｄｕｒｉｎｇ　ｔｅｓｔ．　

ITE and TM4 2017 winter shut down leak check are finished. All ITE primary, secondary vacuum vessel and TM4 water lines are good. No any leak has been found.

I did a vacuum leak check on all ITE primary vacuum vessel and secondary vessel.I also did a helium pressure test(80psi ) on all TM4 water lines. There is no leak has been found.ITE and TM4 are both leak tight now.

ITE primary vacuum vessel and TM4 waterlines:

Hooked leak detector after TP1 between BV1. leak detector base pressure :0.0xe-4 torr. base leak rate:1.8x e-8 atm.cc/sec.sprayed helium around all TM4 and exit 1 ,2 module primary vessel including all flanges,  gauges, bellows,turbos,blank offs,etcThere is no  any response  on leak detector. All water lines  had been pressurized with 80 psi helium  for 5 minutes. The leak rate always stayed at 1.8xe-8 atm.cc/sec which is the base leak rate  on ITE this time, and no vacuum pressure change also.The TM4  water lines and ITE primary vacuum vessel are leak tight.

ITE secondary vacuum vessel:

Hooked leak detector after TP1S between BV1S. Leak detector base pressure :0.0xe-4 torr.Base leak rate:0.0xe-9 atm.cc/sec. Sprayed helium around all TM4,EXIt 1,2  module secondary vessel including alll flanges,gauges, air cylinders , valves, and blank-offs.There is no any response on leak detector . tThe late rate  kept at 0.0XE-9 ATM.CC/SEC, and no pressure change either.The ITE secondary vacuum vessel is leak tight.

ITE and ITW water system paddle wheels and coils on all flow sensors in pits have been replaced. It's a SAS job.

ITE TP4S was broken down last night . I stopped the ITE pumps and vented station with Argon this morning. Edi and I replaced the broken pump with a new pump. The ITE is under roughing now.

Tony and I replaced the ITE TP4 turbo pump today. The pumping time on controller has been reset to 0. The replaced broken  pump is bagged and stored at west end of TH.

ITE TP3 is replaced. ITE is under vacuum again. All turbo pumps are started successfully. Current draw on pumps are normal so far.

ITE TM3, entrance module, and 2A3 window flange seals have been leak checked this morning after 2 new seals replacement.The LD base leak rate was 0.0xE-9 atm.cc/sec,  base pressure was 0.0 XE-4 Torr. I sprayed lots helium around the TM3, entrance module and 2A3 flange seals. No any response had been found on LD during the  spraying. All three flanges are sealed perfectly now.

ITE MSP water circuit flow wheel was replaced yesterday due to poor performance.

By retrieving data further, It has been found no directly relationship between IG1S surging and dump plug water opening. Vacuum surging is 10minutes ahead dump water supply to circuit. SEE attachment 1. Also, The ITE IG1S start to behavior unusual in middle of Feburary. See attachment 2. Today,  ITE IG1S is still slowly climbing up. I decide to leak check ITE vacuum vessel. Before  leak check, for more information and trouble shooting. I closed water supply to ITE to see if vacuum has response on it. I will return water supply to ITE  tomorrow morning.

Water supply to ITE is returned this afternoon at 2: 10 PM.  Everything works fine so far

I leak checked ITE secondary vessel vacuum. A leak have been found in March 09th noon which is located between entrance module and TM2 top tank flange o-ring seal( on tank flange). It could not be confirm on which side of the o-ring the leak is from.

During last night, ITE IG1S reading went back to normal low E-7 range and stays in this range now. So I leak checked same area again this morning. The leak disappeared now. The o-ring works sometime , but not all the time. The plan for this issue: Change ITE target module side o-ring when TM2 is move out., and watch on the ITE IG1s when TM4 is moved back to ITE and pumped down.