| Cryocleaning mixture |
| 0837 | Start cleaning mixture through cold LN2 Trap 2, V6 = 12.4% |
| 0840 | Increase V6 to 12.8% to speed up circulation |
| 0854 | Increase V6 to 13.0% to speed up circulation |
| 0856 | Increase V6 to 13.1% to speed up circulation |
| 0927 | Stop cryocleaning, Trap 2 50 minutes. |
| 1030 | Start cleaning mixture through cold LN2 Trap 1, V6 = 13.2% Later realized I never opened trap speedivalve. |
| 1038 | G2 goes to 950 mbar. This is too aggressive. Close V13A, V14 and open V9 to let some back into the dump. |
| 1039 | Reduce V6 to 13.0%. Once G2 falls to 650 mbar, close V9 and reopen V14 and V13A to restore flow at safe pressures. |
| 1045 | G2 is slowly climbing again to 800 mbar instead of falling like normal. Maybe this trap is full and getting clogged up? Reduce V6 again to 12.9% |
| 1047 | We still have flow, but it seems less than normal. |
| 1120 | Stop cryocleaning, Trap 1 50 minutes. |
| 1133 | Crap, realize that I had forgotten to open the speedivalve to trap 1 in this last “cleaning”. That's why things were strange. Not sure why it seemed like I had flow though. Continue pumping mix to dump. |
| 1138 | Restart cleaning mixture through cold LN2 Trap 1, V6 = 13% |
| 1040 | Increase V6 to 13.1% to speed up circulation |
| 1143 | Increase V6 to 13.2% to speed up circulation |
| 1145 | Increase V6 to 13.3% to speed up circulation |
| 1228 | Stop cryocleaning, Trap 1 50 minutes. |
| 1321 | Check pressure in warm Trap 2: 7.5 mbar. Pump out with scroll pump |
| 1334 | Start cleaning mixture through cold LN2 Trap 2, V6 = 12.8% |
| 1337 | Increase V6 to 12.9% to speed up circulation |
| 1339 | Increase V6 to 13.0% to speed up circulation |
| 1347 | Increase V6 to 13.1% to speed up circulation |
| 1424 | Stop cryocleaning, Trap 2 50 minutes. |
| 1438 | Check pressure in warm Trap 1: 17.5 mbar. Pump out with scroll pump |
| 1445 | Start cleaning mixture through cold LN2 Trap 1, V6 = 13.2% |
| 1450 | Increase V6 to 13.3% to speed up circulation |
| 1455 | Increase V6 to 13.4% to speed up circulation |
| 1505 | Increase V6 to 13.5% to speed up circulation |
| 1535 | Stop cryocleaning, Trap 1 50 minutes. |
| 1550 | Check pressure in warm Trap 2: 130.8 mbar. Dump pressure is still at 720 mbar, so we must have got some air in while moving the traps around. Dang! Pump out with scroll pump. |
| 1600 | Tighten LN2 cold trap o-ring seals slightly, though they seem pretty secure. We'll just try again tomorrow… |