2019/02/26 (Tuesday)
| Status: | Haven't started cryocleaning mixture yet. Tower is ready to assemble but we need more clamps and spacers to mount the 100mm external electrode. |
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| Cryo | |
|---|---|
| 0955 | Pump out LN2 cold traps again, then return them to bath and fill bath. |
| 1000 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.4% |
| 1010 | Increase V6 → 12.7% to restart flow |
| 1015 | Increase V6 → 12.8% to speed up flow |
| 1035 | Increase V6 → 12.9% to speed up flow |
| 1100 | Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 557-577 mbar. Pump mixture to dump. Removed 23.1 mbar |
| 1120 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 12.8% |
| 1125 | Increase V6 → 12.9% to restart flow |
| 1130 | Increase V6 → 13.0% to speed up flow |
| 1220 | Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 567-582 mbar. Pump mixture to dump. Removed 8.3 mbar |
| 1240 | Trap 1 is warm. Check contents: 24.9-1.8 = 23.1 mbar on G1. Pump out with scroll pump. |
| 1300 | Start cryocleaning mixture through LN2 Cold Trap 1, V6 = 12.8% |
| 1305 | Increase V6 → 13.1% to restart flow |
| 1320 | Increase V6 → 13.2% to speed up flow |
| 1400 | Stop cleaning through Trap 1 after 60 min. G2 flow pressure was 562-608 mbar. Pump mixture to dump. Removed 6.2 mbar |
| 1420 | Trap 2 is warm. Check contents: 10.1-1.8 = 8.3 mbar on G1. Pump out with scroll pump. |
| 1440 | Start cryocleaning mixture through LN2 Cold Trap 2, V6 = 13.0% |
| 1445 | Increase V6 → 13.2% to restart flow |
| 1450 | Increase V6 → 13.3% to restart flow |
| 1525 | Increase V6 → 13.4% to restart flow |
| 1540 | Stop cleaning through Trap 2 after 60 min. G2 flow pressure was 558-598 mbar - no flow about half the time. Pump mixture to dump. Removed 3.5 mbar |
| 1600 | Trap 1 is warm. Check contents: 7.9-1.7 = 6.2 mbar on G1. Pump out with scroll pump. |
| Tower Assembly | |
|---|---|
| 1030 | Measure height of 100mm electrode: 1.3135-1.3140 inches. Measure post heights on housing: 1.1965-1.2015 inches. Total spacer thickness per post should be electrode height minus (post height + 40 mils) Total spacer height per post: 72-78.5 mils Total spacer height per post side, average: around 38 mils |
| 1130 | Start making new 20 mil thick copper spacers in the student shop. |
| 1630 | Finished making 36 20-mil spacers. Filed off the burrs. Need to clean them still. |
