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.

Conducted a more thorough leak check this morning with Edi. He found a leak on the base of the  blue F/T insulator for the multi-pin connector (see attachment). I discovered that all the bolts could rotate freely in the threads as they were too small. The bolts were replaced. The leak rate was reduced but still significant. The o-ring will likely need to be replaced.

Tuesday, November 10, 2015, 17:00: Could not find new o-ring. Cleaned groove and o-ring and applied o-ring grease. Re-attached F/T.

Tuesday, November 10, 2015, 16:53: Roughing

Tuesday, November 10, 2015, 18:24: TP1S started

Tuesday, November 10, 2015, 18:30: TP1 and TP2 started

Tuesday, November 10, 2015, 18:41: All 3 turbos at speed.

Thursday, November 12, 2015, 08:30: Purged backing pump using purging function. Vacuum in backing line recovered to previous value. 

Module connected for HV testing. No target heating possible. All F/Ts tied together to HV common. EZL connected.

Friday, November 13, 2015, 11:20: Started water package

Friday, November 13, 2015, 11:52: 1kV on BIAS and 1 kV on EL

Friday, November 13, 2015, 12:54: BIAS/EL 10 / 5 kV

Friday, November 13, 2015, 12:59: BIAS/EL 15 / 7.5 kV

Friday, November 13, 2015, 13:04: BIAS/EL 20 / 10 kV

Friday, November 13, 2015, 13:08 : BIAS/EL 22 / 11 kV. Some sparks.

Friday, November 13, 2015, 13:17: Sparking at 22.5 kV. Had to return to 20 kV to recover. Back at 22.5

Friday, November 13, 2015, 13:21 : BIAS/EL 24 / 12 kV. 

 Friday, November 13, 2015, 13:27: Heavy spakring around 24.5 kV. Had to return to 20 kV to recover.

Friday, November 13, 2015, 13:31: Attempted to increase voltage again. Sparking started around 23 kV. Had to lower to 20 kV.

Friday, November 13, 2015, 13:36: 9 sparks for the last 5 min.

Friday, November 13, 2015, 13:45: Spark rate reduced, but multiple sparks encountered again at 20.5 kV. Reduced back to 20 kV

Friday, November 13, 2015, 13:50: Increased sparking at 20 kV. Had to lower to 18 kV

Friday, November 13, 2015, 14:07: Back at 20 kV

Friday, November 13, 2015, 14:13: BIAS and EL off

Monday, November 16, 2015, 08:18: Fault on chiller. Reset chiller unit on the roof.

Anders Mjos wrote:

Conducted a more thorough leak check this morning with Edi. He found a leak on the base of the  blue F/T insulator for the multi-pin connector (see attachment). I discovered that all the bolts could rotate freely in the threads as they were too small. The bolts were replaced. The leak rate was reduced but still significant. The o-ring will likely need to be replaced. Tuesday, November 10, 2015, 17:00: Could not find new o-ring. Cleaned groove and o-ring and applied o-ring grease. Re-attached F/T.

Tuesday

Steerer wire had disconnected again. See DocuShare for photos.

Thursday, November 12, 2015

Leak checked the fixed F/T and the panel for steeerers. No leaks found.

Target to Anode and target to Common showed ~ 500 kOhm values. No leaks above 3E-9 atm-cc/s seen. See attached.  

 Problem found between ANODE (F) and chassis 90 kOhm. See attachment for details.

I stopped the TM3 and TCS vacuum pumps and water system. The TM3 is disconnected and vented. It will be moved to silo this afternoon.

TM#3 has been moved back to the NW silo.

They were moved for TM3 inspection job last week. All the bolts on the panel are hand tight only now since they will be removed out for camera installation during next stage inspection.

TM#3 has been moved from the NE Silo to the south hot cell.

Electrical check of TM#3 no target at the south hot cell. see attached for results.

I did a 5KV mega test on TM3.  Only5Mohm @5kV between coli line PQ and chassis(ground). It confirmed the close gap between P,Q and GE. Other lines are ok. See attachment.

David Wang wrote:

I did a 5KV mega test on TM3.  Only5Mohm @5kV between coli line PQ and chassis(ground). It confirmed the close gap between P,Q and GE. Other lines are ok. See attachment.

See attachment for sparking signs of the water lines mentioned  above (Coil and Ground Electrode lines) in TM3 Source Tray.

TM#3 has been moved back to the north east silo.

Aurelia Laxdal wrote:

David Wang wrote: I did a 5KV mega test on TM3.  Only5Mohm @5kV between coli line PQ and chassis(ground). It confirmed the close gap between P,Q and GE. Other lines are ok. See attachment. See attachment for sparking signs of the water lines mentioned  above (Coil and Ground Electrode lines) in TM3 Source Tray.

PLEASE NOTE: the resistance values for A and B on David's attachment are not correct since these measurements were done after Chad removed the target and the heat-shield bracket was moved, so consequently the water lines were not at their nominal locations. Once they were back in plac,e David took another measurement and the resistance values for A and B showed also 3,000 MOhm (as it was for most of the lines). The only lines that still showed a low resistance were the Coil lines. 

TM#3 has been moved from the north east silo to the conditioning station.

TM#3 is now in the south hot cell.

Last Friday July-15, TM3 was leak checked at TCS. All air to vacuum seals on service cap are good.  Helium pressure test on  TM3 water lines(except GE, HS, and Window) were done. Leak detector has no response at 0.0xE-9 atm.cc/sec. They are leak free.

David Wang wrote:

Last Friday July-15, TM3 was leak checked at TCS. All air to vacuum seals on service cap are good.  Helium pressure test on  TM3 water lines(except GE, HS, and Window) were done. Leak detector has no response at 0.0xE-9 atm.cc/sec. They are leak free.

Friday July 15: did HV tests (with no target installed and with the anode wire removed ). <br>

TM3 went up to 22.5kV. At this voltage it started sparking. The EL was kept at 1/2 with respect to the HV BIAS. <br>

Also HV tests were done while the EL was kept at zero V. In this case, the EL voltage was once in a while spiking  up (up to 4kV). <br>

During sparking we saw responses in the vacuum. Checked the Service Cap (with the HV Cover) in the Target Hall: we couldn't hear/see sparks there.  <br>

The HV was turned off in the same day, after 5:30pm.

I started vacuum system.

I started TCS water system. The chiller does not work properly still. But, It will not affect the TM3 HV conditioning.  HV cover is installed on TM3 in TH. The module is ready for HV conditioning.