2017/10/02 (Monday)
| Status: warming. All mixture in dump. LN2 traps warm and pumped out. Contaminants from fridge were pumped out at 220 K. Cryostat vacuum jacket has been softened with He and N2. | |
| 0730 | MC(Cernox) = 279 K. Warming at a somewhat higher rate than measured yesterday, tau = 12.0 hours. Should hit 50 F at about 10:30 today. |
| 0930 | MC(Cernox) = 275.0 K. This is a somewhat more accurate reading on the LakeShore display, slightly different calibration from the LabVIEW output. Lab 24.0 C 39% humidity. Dew point 48 F / 8.9 C / 282.0 K. If the warming is still going at a rate of tau = 12.0 hours, then we'll hit dew point at about 14:00 |
| 0955 | Yesterday the recovery valve to the hose that connects to the storage Dewar was closed, but the one that isolates the cryostat (near the copper coil) was left open. Closing this valve now. |
| 1025 | Let a little over 1 atm of N2 into IVC. |
| 1115 | MC(Cernox) = 276.6 K. Unfortunately this indicates slower warming, tau = 23.3 hours. So looks like we won't hit dew point until 18:20 tonight. |
| 1305 | Pumping mixture to dump - after about 1.5 hours, G2 = 780.6 mbar. Close V9 and turn off He3 pump. |
| 1435 | MC(Cernox) = 279.9 K. Tau a little shorter than earlier, 19.0 hours. Should hit 282 K (dew point) around 17:00 |
| 1656 | Power down DCRCs |
| 1710 | MC(Cernox) = 282.4 K |
| 1717 | Hook up dewar jacket to pump manifold. Pump on manifold with scroll pump. Accidentally open dewar jacket valve without pumping out line between manifold and dewar jacket. Now, start pumping on dewar with scroll pump. Pressure reads 1.6 mbar. |
| 1727 | Pump manifold pressure = 1.6e-1 mbar |
| 1734 | Pump manifold pressure = 7.4e-2 mbar. Switching to turbo pump. |