Dan and I leak checked TM2 and ITW primary vacuum vessel. It was found a 1X E-7 atm.cc/sec leak on top T flange seal between TM2 and dump module in first time check. But it is not a repeatable leak. I checked the same spot and around area two more times with increased helium volume.It did not show up again. The first response could  be a helium drift to dry scroll pump. I will check it again later. The primar vacuum vessel on ITW and TM2 are leak free. 

Dan and I found a small  leak on ITW dump module  top flange seal. The leak detector got a response  to 7xE-9 atm.cc/sec when I spray the helium to west side of dump module top flange. We tested again, and got same result. The o-ring which seals ITW dump module top flange is deteriorating. It need to be replaced at a proper time. This is the only air to vacuum leak we confirm so far on primary and secondary vacuum vessel on TM2 and ITW. The module and station no other air to vacuum leak.

The TM2 water lines helium pressure tested started in ITW. The helium pressure 70psi. The result so far is: Window: good, GE: huge leak directly shoot over E-7 atm.cc/sec( need to be confirmed tomorrow), HS: good, EE: good, MSP: tiny leak which is response to 3-4xE-9 atm.cc/sec. Coil 1 : small leak which is response to 1.3XE-8 atm.cc/sec. Tomorrow, We will test the rest water lines on TM2which are TA+, TA-, Tube+, Tube-, and coil 2. And We will confirm the GE huge leak at the last.

Finished the helium pressure test on TM2 water line.70 psi helium, The result of the rests 5 circuits: coil 1: leak 7.2xE-8atm.cc/sec,Ta(+): small leak 1.7XE-8 atm.cc/sec, Ta(-) small leak 8.7xE-9atm.cc/sec,Tube(-) 1.5 x E-8 atm.cc/sec. Tube(+)small leak 3.7xE-8 atm.cc/sec.    We repeated the helium pressure test on GE. There is a huge leak on TM2 GE circuit. The leak detector shoot up to E-7  atm.cc/sec right after the helium was applied.It went up to E-6 range in less than 1 minutes.

TM 4 had been leak check in ITE due to   relatively high PNG1 and IG1 readings.All TM4 primary and secondary  vessel air to vacuum seals had been leak checked. All water lines in TM4 had been helium pressured . There is no leak had been found so far.

Service cap leak checked this afternoon. Found multiple leaks of 10E-8 to 10E-7 range. Connected to the backing line with IG1 at ~4E-6 T, CG1A around 40 mT. Got responses around large round flange on top, rectangular side panels, water f/t on GND and water f/t on HV. Will resume leak checking tomorrow to attempt to pinpoint sources of leak more accurately.

ITW Entrance Module was leak checked yesterday with the support of Vacuum Group (Dimo & Edi). The leak detector was connected to primary backing vacuum line. A leak response was found near the bellow for the beam profile monitor on top of the Entrance Module. It could be confirmed today by actuating the monitor, that the leak was indeed at that location. The plan is to move the TM and Entrance Module out for target exchange and repair, respectively. Drawings of the device available on ITA0200and ITA5128

I leak checked new installed TM4 TP1 at conditioning station. The CS vacuum gauges reading were at 1.0-1.5xE-6 torr . Leak detector base leak rate 0.0xe-9atm.cc/sec, base pressure 0.0xe-4torr. I sprayed helium around the pump  inlet flange and KF 25 pump outlet flange to pump joint. There is no response on leak detector. The new installed TP1 is leak tight.

Maico, Chad and I conducted a leak check on all affected lines following tweaking of cooling line gaps. All lines pumped down to a level of 10^-9 torrliter/sec with no leaks detected with Helium.

Roughing started by David.

Friday, June 26, 2015, 15:31: Started TP1S

Friday, June 26, 2015, 15:38: Started  TP1 & TP2

Friday, June 26, 2015, 15:47: TPs timed out. Restarted

Friday, June 26, 2015, 15:49: TP2 at speed

Friday, June 26, 2015, 15:49: TP1 at speed.

Friday, June 26, 2015, 15:54: IG1 on. 4.7E-5 T.

Friday, June 26, 2015, 15:56: IG2 on.  9.8E-5 T

Friday, June 26, 2015, 15:59: IG1S on. 2.9E-4 T

Leak found on service cap panels (David W)

Monday, June 29, 2015, 10:29: Stopped turbo pumps.

Chad and I did a leak check on TM4 HS line with UCx 26# installed . Base LR 0.0X E-9 atm.cc/sec. Base pressure 0.0XE-4 torr.  No response on leak detector during leak check.

Tried to leak check TM4 Ta57# at TCS. LD failed to pump down properly at fine range. It always tripped at 4 torr. I cheeked all vacuum lines seals and adapters on top of module to LD. Everything is good. Chad said the VCRs at SHC can not be tightened any more. Discussed with Anders, we decide to move module TCS and helium pressure test there.  The same difficult happened last time on TM4 UCx24# at SHC when leak check. But,it is solved by pressurize the line at SHC last time.  

The HS line was pressurized with 70 psi helium on Oct 04th at TCS.. LD 0,00X E-9atm.cc/sec no change in 2 minutes. No leak.

TM3 leak check at conditioning station without target: TM3 all air to vacuum seals have been leak checked . They are all good. Water lines TAR(+-), TUBE(+-), GAS, MSP , COIL2(+-), EE, HS(1,2) , GE,and WINDOW have been helium pressurized to 70 psi for 2 minutes each . No response had been found on leak detector. They are leak tight.. Leak detector BR 0.0xE-9atm.cc/sec, BP 0.0xE-4 torr. TM3 and CS vacuum: PNG15.2xE-6 torr, IG1 8.8xE-7 torr,IG2 2.8xE-6torr, IG1S 1.3xE-6 torr.      

Chad and I leak checked TM2 tube heater(+) water line yesterday afternoon. The water line was difficult to pump down on base leak rate, but LD  base pressure was fine . The base pressure on leak detector was pumped to 0.0XE-4 torr quickly. The base leak rate only could be pumped  to  4.5 xE-8 atm.cc/sec after 1 hour waiting time. All vacuum connections to leak detector  in the target hall were leak checked and they were good. Chad checked helium flow in SHC. He sprayed helium twice on tube heater(+) water block soldering joints. I did not see any response on leak detector in TH.The base Leak rate and base pressure did not move up during the test.  See attachment pictures.

Bevan and I did a leak check on TM2 tube heater+ from inside service cap in TH. The leak detector base leak rate 0.0xE-9 atm.cc/sec, base  pressure 0.0xE-4totrr. One of side panel on service cap was opened. Bevan sprayed the helium to the "D" line inside the blue insulator.The helium flow was checked , and he sprayed twice. No response has been found on leak detector.  See attachment pictures

Chad and I  did the Leak checked TM2 tube heater (+) water line  with rubber insert plugged water block on " D"  in SHC. The Leak detector was very easy to pump down to the bottom leak rate and pressure. Chad checked the helium flow in SHC, and sprayed 10 second helium on  the block. There is no response had been found during the test. The test was repeated again and no leak has been found. See attachment pictures.

TM3 has had all of the water lines pressurized with Helium and the Helium Leak detector was connected to the turbo pumps. There were no leaks detected.

maicodallavalle wrote:

TM3 has had all of the water lines pressurized with Helium and the Helium Leak detector was connected to the turbo pumps. There were no leaks detected.

 While pressurizing the lines it was found some of the lines had water in them. It is unknown where this water came from. Perhaps David connected the conditioning station last time it was in? Lines that were free of water were A, B, C, and window The leak detector pumped down to 4.0 x 10^-3 Torr and the leak rate was 1.4 x 10^-9 atm-cc/sec, there was no response during the leak test and the leak rate continued to decrease during the test.

Isaac and I leak checked TM4 HS line with new UCX target. The leak detector base LR 0.0xE-9 atm.cc/sec, base pressure0.0xE-4torr. Isaac sprayed helium  on both VCR connections(5 seconds each) and flushed helium around the target for 6 seconds. No response on leak detector.

Chad and I leak checked TM4 HS water line with new Ta#45 target installed at SHC. Leak detector base leak rate 0.0Xe-9 atm.cc/sec, base pressure 0.0Xe-4 torr. Chad sprayed helium twice on each of HS 2 VCR joints.No leak has been found. The joints are leak tight. The helium pressure test  will be done at CS later.

This morning Chad and I leak checked TM4 HS line with new Ta#44 target installed. I calibrated LD before the check. Before check, the LD base LR 0.0xE-9 atm.cc/sec, base LP 0.0xE-4 torr. Chad sprayed helium on both VCR fittings and did a flush around the target. There is no any response had been found on LD,. The line is good on leak tight. with spray method.  No helium pressure test on the HS line at CS since TM4 was moved back to ITE directly.

Chad and I leak checked TM4 HS line with Ta#42 target on the module. The leak detector base LR 0.0xE-9 atm.cc/sec, base pressure0.0xE-4 torr. Chad applied helium to the joints, and flushed the helium around the target. No leak has been found.I will do helium pressure test on this circuit at CS later.