2021/02/12 (Friday)
- Lab in-person: Matt
- Virtual partner: Zach, Derek
| Status | Run 74 prep. Main bath is up. Need to do more cryocleaning and prepare room-temperature circuit for HV biasing. |
|---|---|
| 1320 | Matt enters lab. |
| 1330 | Check contents of warm LN2 Trap 1: 6.5 mbar. Pump out with Scroll Pump |
| 1355 | Check contents of warm LN2 Trap 2: 4.7 mbar. Pump out with Scroll Pump |
| 1410 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 11.3% |
| 1415 | Increase V6 → 11.5% to restart flow |
| 1425 | Increase V6 → 11.6% to speed up flow |
| 1445 | Increase V6 → 11.7% to speed up flow |
| 1500 | Increase V6 → 11.8% to speed up flow. Pressure looks like it's going up too fast, so step back down to 11.7%. (Not sure whether this makes any difference due to possible slop in V6 needle valve.) |
| 1510 | Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 570-640 mbar, then up to 930 mbar toward the end. Pump mixture to dump. Removed 6.7 mbar. |
| 1500 | Check source mover diverter board settings. The DIP switches set to OFF to disconnect the through-lines correspond to coils and end stops. So these all make sense. This will be used in series with the HV diverter board with DIB 2 (Cable 3). |
| 1540 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 11.9% |
| 1845 | Stop cleaning through Trap 2 after 185 min. G2 flow pressure was 570-810 mbar. Pump mixture to dump. Removed 3.1 mbar. |
| 1555 | Matt exits lab |