2019/09/10 (Tuesday)
| Status: warming up. All mixture in dump. LN2 Cold Trap 1 warm and ready to pump out. IVC has about 1 atm of N2 @ RT. Cryostat vacuum jacket has He and N2 in it. 1K Pot needle valve open. | |
| 0211 | Recovery meter = 312597.00 cuft. Recovery rate = 1 cuft/35 hours. |
| 1000 | MC(Cernox) = 249.0 K, rising at 1.8 K/hour. This suggests a warming time constant of 24.4 hours. At this rate it will take 45 hours to reach dew point (around 55 F). That's Thursday at 7am. |
| 1000 | Recovery meter = 312597.14 cuft. Recovery rate = 1 cuft/59 hours. |
| 1035 | Set MC and Still heaters to 20 mW each |
| 1040 | Let 19 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. Vacuum jacket → 1.4 mbar Let another 19 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. Vacuum jacket → 1.6 mbar |
| 1050 | MC(Cernox) = 250.5 K, rising at 1.7 K/hour. Using room temp of 296.25 K this suggests a warming time constant of 26.9 hours. Dew point is around 10 C according to the lab thermometer and humidity meter. Should take 33.7 hours to reach due point. That's Wednesday night at 8:33 pm. |
| 1230 | Took down remaining shield and West lead wall. |
| 1500 | MC(Cernox) = 258.6 K, rising at 1.94 K/hour. This suggests a warming time constant of 19.4 hours (a little faster after turning on the heaters and adding more gas to the cryostat vacuum jacket). Should take 20.5 hours to reach dew point (50 F). That's tomorrow morning at 11:28. |
| 1500 | Recovery meter = 312597.23 cuft. Recovery rate = 1 cuft/57 hours. |