ITH MP1 is replaced today with a new style pump.The new pump is 0.75 inch higher than  old pump on inlet and exhaust so a new solid inlet adapter  (KF50-25) has to been used. For future secondary pump ITH MP1S replacement, we need a new adapter 0.75 inches shorter as well.   The new pumps is started . Everything works fine. Old pumps is drained , bagged, and stored in TH B2 level. All radioactive garbage produced during the job are bagged , tagged, and stored in TH as well.

I asked MCR to switch off ITW TP3,4 TP1s,2s this morning.

ITW entrance module has been disconnected.  All connections are labelled before or during disconnection. The 24VDC electrical plug on ITW TP1S is broken . It will be replaced with a new plug. The lift yoke is installed onto module without difficulty.   

Anders and I leak checked new 2A2 window seal on ITW side. Leak detector was connected  to ITW TP4.  Base  leak rate 0.0Xe-9 atm.cc/sec. base pressure 0.0xe-4 torr.  Sprayed 15-20 psi directly underneath 2A2 window by using exist 2a2 window leak check copper tube. The leak detector got response in 5 seconds when helium was applied. the leak rate was 5xe-6 atm.cc/sec. Once the helium source was closed, the leak rate dropped quickly back to base level. To confirm the leak is at window , I sprayed 15 psi helium around all top flange seals of TM and entrance module.  There was no direct response during the spray( about 1.5- 2 minutes). There was a weak slow up response (up to 1.0 xe-7 atm.cc/sec) which was started after 1.5 minutes of spray. The weak response is cause by helium drift in my view.   Our conclusion is the 2A2 window seal on ITW side is not perfectly sealed.  The elak we saw on LD is ture , and it is located on window.  The station will be vented soon for shielding plug moving back. .

Leak detector is connected to ITW TP4. LD Base leak rate 0.0XE-09 atm.cc/sec. Helium line is connected to existing window leak check 1/8 " copper tube. Applied 18psi helium for 1 minute. No response on LD. The window seal is good on ITW vacuum vessel. 

  Helium pressure test on TM4  water lines is done this morning. 70 psi helim , 1 minutes time to each circle. The result:

A(oven+): 0.00xE-9 atm.cc/sec

B(Oven -): 8.1Xe-7 atm.cc/sec

C(tube -): 0.00xE-9 atm.cc/sec

D(tube+): 1.0xE-5 atm.cc/sec

PQ(coil 2): capped on top. water lines were removed because of leak

RU(Coil1): 0.00xE-9 atm.cc/sec

EE: 0.00xE-9 atm.cc/sec

MSP: 0.00xE-9 atm.cc/sec

HS: No target, capped on top. It was fine on last target check in 2017 Oct.

window: Capped on top. Containment box is not installed.

The leak check on D line caused the IG1 small response during test.

B and D circle are double checked. The reasults are same.

D line leak is in E-5 atm.cc/sec range. It is possible to locate it by using helium spray method in SHC. The containment box is not on so it should be easy to do it.

Switch on IGA gauge at TCS and apply helium and water at certain psi to check the IGA response may give us more information on these leaks.

 All lines were test in last year shut down. They were good.

At 8:50 AM today, I applied water to TM4 tube heater - (B) line at TCS. All high vacuum gauges got response on this action. Water is leaking through B line on TM4.

It should be D line . David 2018-06-05

I did a helium pressure test on TM2 water lines at TCS. We will remove the TM2 source tray soon so this test is a reference check for future new source. The result:

Helium 70 psi, 2 minutes to each circiut. Leak detector  base LR.0.0x e-9atm.cc/sec, base pressure  0.0x e-4torr

Ta+(A)  0.0x e-9atm.cc/sec

Ta-(B)  0.0x e-9atm.cc/sec

Tu-(C) 7.8x e-7 atm.cc/sec

Tu+(D) 3.5x e-7 atm.cc/sec

Coil 2(PU) 0.0x e-9atm.cc/sec

Coil 1(RU) 0.0x e-9atm.cc/sec

EE 8.2 x e-9atm.cc/sec

MSP 0.0x e-9atm.cc/sec

Containment box window  0.0 xe-9atm.cc/sec

HS  no target and opened. No test.

All water lines on module side in TM2  should be in good condition according to this test . The leak response we found on B and C lines are from water block seals mostly.           

I switched off TM2 and TCS vacuum pumps. The TCS and TM2 will be under vacuum without pumping.

See attachments

Annual ITW water signals interlock check are done. Everything works good.

TM2 has been connected to ITW. All turbo pumps are started. See attachment for connection checklist.

I did a helium pressure test on TM2 HS line at TCS. At 70psi helium, the leak rate is 2.5 xE-7 atm.cc/sec. I think this is the number that close to result before which is 1.7xE-9 atm.cc/sec. WE know there is a small leak on this water block seal. Chad  and I did helium  spray check yesterday at SHC. It was good at bottom scale.  No much worry on this low E-7 range leak.

TM4 has been disconnected in ITE this morning. See attachment.

TM4 has been connected to TCS. vacuum system and water system are started. Everything looks fine.

Chad and I leak checked TM4 HS line after UCx 24 is installed. No leak at 5xE-9atm.cc/sec.  Today, I did helium pressure test on HS line at TCS. No leak at 70 psi helium 0.0xE-9 atm.cc/sec.

I stopped TM4 and TCS vacuum system at TCS. TCS and TM4 is venting with argon now.

TM4 TP2 could not be started  after module was connected back to ITE on Sep 04th. It was replaced with a new pump on Sep 05th. The new pump works fine.

TM4 has been connected to ITE on Sep 04th. See attachment  for checklist.

TM2 was disconnected in ITW this Tuesday. See attachment for checklist.