2021/02/03 (Wednesday)
- Lab in-person: Matt
- Virtual partner: Derek
| Status | Run 74 prep. Main bath is up, need to finish tightening screws. |
|---|---|
| 1305 | Matt enters lab |
| 1310 | Turbo on IVC = 16 nbar |
| Yesterday while cleaning mixture through LN2 Trap 2 I accidentally opened V13a, letting some mixture into warm, dirty Trap 1. So I need to deal with that. | |
| 1310 | Remove LN2 Trap 2screws from bath to let it warm up. Put LN2 Trap 1 back in the bath to cool it, and fill LN2 cold trap bath. |
| 1320 | Now that LN2 Trap 1 is cold, pump its contents to the dump. |
| 1330 | Remove LN2 Trap 1 from bath to let it warm up |
| 1435 | Spent a long time trying to get the MB bolts to go in. The one directly north got completely stuck, and wound up breaking off with part of the bolt busted into the hole. So that is definitely a bad hole now. Removed all the small bolts that bolt the fridge to the MB, then loosened the bolts for the three fridge brackets that attach the fridge to the stand - the ones on the horizontal sections. Then tightened the big bolts and the medium bolts on the bottom - all the ones that tighten the MB to the stand. Now the fridge can be shifted a little, and we'll try to line it up for the holes. |
| 1440 | Check contents of warm LN2 Trap 2: 8.5 mbar. Pump out with Scroll pump. |
| 1500 | Check contents of warm LN2 Trap 1: 23.5 mbar. Pump out with Scroll pump. |
| 1525 | Finish tightening MB bolts. Inserted small bolts in all the good holes, shifting the fridge a bit to get them lined up. In the process, one other bolt got stuck, and broke. After tightening the small bolts, then tightened the fridge brackets. Loosened the bolts on the vertical sections of the brackets to release any tension there, then tightened those as well. |
| 1530 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.6% |
| 1535 | Increase V6 → 12.7% to restart flow |
| 1540 | Increase V6 → 12.8% to restart flow |
| 1600 | Increase V6 → 12.9% to speed up flow |
| 1645 | Stop cleaning through Trap 1 after 45 min. G2 flow pressure was 595-670 mbar. Pump mixture to dump. Removed 11.7 mbar. |
| 1550 | Set lock combination for PAN 443B (PuBe source howitzer room) to 2341. Put key (in cardboard box) in top drawer of filing cabinet in PAN 43 lab. |
| 1640 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.7% |
| 1655 | Increase V6 → 12.8% to speed up flow |
| 1655 | Matt exits lab |
| 1535 | Increase V6 → 12.9% to speed up flow |
| 1810 | Stop cleaning through Trap 2 after 90 min. G2 flow pressure was 600-720 mbar. Pump mixture to dump. Removed 0.0 mbar. - because I forgot to close the valves to stop pumping to dump. |