TM2 helium pressure test result at ITW. 70 psi helium 3 minutes on each circuit. LD base LR0.0XE-9atm.cc/sec BP 0.0XE-4torr. ITW IG1 1.22Xe-7 torr, ITW IG1S 1.31XE-7torr, ITW PNG4 2.66XE-6Torr(ITW TP4 off).
| |
2017-01-13 (atm.cc/sec) |
2017 mini shut down |
| HS |
0.0 x E-9 |
|
| Window |
0.0 x E-9 |
|
| EE |
2.7 x E-9 |
|
| Ta+ |
2.2 x E-9 |
|
| Ta- |
6.6 x E-9 |
|
| Tube- |
1.3 x E-8 |
|
| Tube+ |
2.8 x E-8 |
|
| Coil 2 |
2.8 x E-9 |
|
| coil 1 |
7.1 x E-9 |
|
| MSP |
6.7 x E-8 |
|
| GE |
leak , no test |
|
All number are getting better comparing to last time check. All ITW vacuum readings are very good. ITW PNG4 was in low E-7 torr range also. At present, it is in low E-6 range due to ITW TP4 switching off. The TM2 water line seals are stable and reliable for 2017 beam run. The same check will be repeated in 2017 mini shut down. |