2018/03/11 (Sunday)
| Status: warming. Main bath empty. LN2 traps pumped out, mixture in dump. 1K Pot evacuated and isolated. Helium in cryostat vacuum jacket. | |
| Note Daylight Saving time began today | |
| 1040 | MC(Cernox) = 187.5 K |
| 1620 | MC(Cernox) = 200.8 K |
| Newton's Law of Cooling/Warming suggests that at this rate the fridge won't reach 273 K until Wednesday morning. Should add more gas to vac jack. | |
| 1705 | MC(Cernox) = 201.6 K |
| 1709 | Let 10 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. |
| 1734 | Warming rate hasn't increased much. Let 30 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. |
| 1744 | Let 63 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. |
| 1802 | Let 100 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. |
| 1814 | Let 100 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. note vacuum jacket reads about 12 mbar |
| 1820 | MC(Cernox) = 204.4 K |
| 1835 | MC(Cernox) = 204.85 K |
| 1855 | MC(Cernox) = 206.1 K |
| 1915 | MC(Cernox) = 207.2 K |
| 1935 | MC(Cernox) = 208.4 K |
| So looks like I've reduced the time constant from 43 hours to 25 hours. Still not fast enough to be warm tomorrow morning. Looks like it will hit 273 K early Tuesday morning. | |
| 1955 | MC(Cernox) = 209.65 K |
| 2015 | MC(Cernox) = 211.05 K |
| 2050 | MC(Cernox) = 213.45 K |
| 2120 | MC(Cernox) = 215.6 K |
| Time constant is closer to 20 hours now, estimated time for 273 K is 10pm Monday |