I did a leak check on TM1 window circuit  2 soldering  stems in service cap.The round side panel was opened for the job. I sprayed helium on the stems for 10 seconds. The leak detector got a tiny response(from 0.0xE-9 atm.cc/sec to 2.0xE-9 atm.cc/sec). The test  repeated again. The second time, LD climbed  to 1.2xE-9atm.cc/sec. It looks like there is a very tiny leak on the stems soldering spots. But , this is not the same leak we found from SHC helium spray which LD climbed to 1.4xE-8atm.cc/sec with only one click helium spray by Chad.

 Because of the high air flow at SHC when the round panel is removed, The result is not conclusive. The same test is done at silo without  airflow. We found a big leak on this soldering stems . See later e-log.

Replaced the custom silver gaskets on the entrance window panel of TM1 this morning...this has eliminated an sign of leak at this joint, however there appears to still be a leak somewhere...a good distance from the vcr joints of the window as we are getting a drift response.

Chad sprayed helium to soldering stems in containment box which we suspected with leak last week. With 1second click  on helium, after 80 seconds waiting time , the LD started to show leak up to 3xe-9atm.cc/sec.

Chad sprayed helium close to service tray and vacuum chase. with 1second click on helium , after 30 seconds waiting time, the LD started to show leak up to 2Xe-8 atm.cc/sec.

After this test, we knew the leak is somewhere in service tray or service cap, but not the soldering stems in containment box we suspected before.The further investigation is needed.

TM#1 has been moved from the south hot cell to the north east silo.

 Leak check TM1 window circuit soldering stems inside service cap when module is located at NE silo. LD base LR 0.0xE-9atm.cc/sec.  Only 1 second tiny amount  helium sprayed on stems soldering joints . LD got a quick response to high E-7 atm.cc/sec.Test is repeated again with same result.  See attachments

TM1 and TCS vacuum system have been connected. All turbo-pumps are started. The pumping down is fine.

TM#2 has been moved from the south hot cell to the south west silo and TM#1 was moved from the north east silo to the conditioning station. All done by 10AM.

TM1 water lines helium pressure check at TCS is done. 70 psi helium was applied to water circuits. Leak detector base leak rate 0.0 x E-9 atm.cc/sec, base pressure 0.0 x E-4 torr. The result shows as below:

The results is good so far as we know the window line is leak on stem in service cap. The HS will be tested later with target on.

 The service cap air to vacuum seals also have been checked. The PNG1 panel and side round panel close to shutter are leak. The o-rings on them need to be replaced.

On March 30th -2016, I doubled checked the air to vacuum seal on the TM1 service cap. The side round panel is leak free actually. The PNG1 panel is leak at the bottom side. Confirmed.

On march 31th-2016, The o-ring(1-1/ 2275) on TM1 PNG1 side panel has been replaced today. The o-ring slot and mating surfaces are cleaned, and new  o-ring is installed. The panel is put back to TM1 and all bolts are tightened.

See attachments.

The results of the TM#1 electrical check from the 29th of March 2016

Electrical check of the target on TM#1, target in question is UC#15. See PDF for details.

TM#1 has been moved from the conditioning station to the south hot cell, had UC#15 installed and then moved back to the conditioning station.

I can not start the TCS pumps due to control page white out. Control group is working on this issue.

Control group fixed the white out problem. I started all turbo-pumps. The pumping down is good so far. The TM1 IG1 is broken. I will check it on next Monday. It could be a broken filament. Then, the filament will be replaced.

New UCx target is installed on the module. 70psi helium,3 minutes. NO response on LD.  LD is pumped to bottom LR and LP during test.

Stop TCS vacuum pumps . Preparing argon venting on TM1 and TCS.

7:34 AM, Disconnected TM1 at TCS, argon venting now.

TM#1 with UC#15 have been moved from the conditioning station to the west target station.

 All turbo -pumps are started.

After ITW HV test is done, TM1 has been connected to ITW. Water signals are checked in electrical room. They are good.

The ITW is configured to take proton beam.

I let isac opp switched off ITW turbo-pumps. The argon vent valve in electrical room is opened. The ITW argon venting will be started  soon.

TM#1 has been moved from the west target to the south hot cell. The target on TM#1 is UC#15.

TM#1 with UC#15 was moved back to the west station due to alpha concerns.