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:
| Ta+ |
0.0 X E-9 atm.cc/sec |
3minutes stabilizing |
| Ta- |
0.0 X E-9 atm.cc/sec |
3minutes stabilizing |
| Tube- |
0.0 X E-9 atm.cc/sec |
3minutes stabilizing |
| Tube+ |
0.0 X E-9 atm.cc/sec |
3minutes stabilizing |
| MSP |
0.0 X E-9 atm.cc/sec |
3minutes stabilizing |
| EE |
0.0X E-9 atm.cc/sec |
3minutes stabilizing |
| HS |
not tested without caps. |
|
| Window |
E-5 range,leak on stem as we knew before. |
10seconds to E-5 |
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. |