2021/09/28 (Tuesday)
- Lab in-personnel: Matt
| Status | Run 74 finished. Warming up. |
|---|---|
| All mixture is in dump. Fridge isolated. 1K Pot isolated. LN2 Trap 2 still has contaminants in it. Some He in IVC and in cryostat vacuum jacket (CVJ) | |
| 0630 | Sorb = 250 K (max) |
| 1345 | MC(Cernox) = 166 K, rising 3.9 K/hr. Implies tau_warming = 33.3 hours. Predicted to reach dew point 7 C in 70.5 hours = Friday at 12:20 pm |
| 1405 | IVC = 25 mbar on Pfeiffer gauge. |
| 1415 | Let about 0.53 bar (on Swagelock gauge) N2 gas into IVC. Isolate IVC and move gas manifold hose over to CVJ port |
| 1420 | CVJ = 0.10 mbar |
| 1425 | Let 14 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. Vacuum Jacket → 0.74 mbar. |
| 1605 | Recovery = 2.9 cuft/day. MB = 0.0 PSI = 111 mbar+1atm (on G3 - opened V1a to monitor.) |
| 1620 | Close He recovery valve from MB exhaust |