| Status | Run 74 in progress. Warming up after 3rd appearance of IVC leak at 4K. Helium in Cryostat Vacuum Jacket, mixture in fridge |
| 1000 | MC(Cernox)/Sorb/1K Pot = 95.0/192/>7 K, G1 (fridge) = 607 mbar |
| 1000 | IVC = 190 mbar. |
| 1000 | Start pumping mixture from fridge and LN2 Trap 1 to Dump |
| 1000 | MC = 95.3 K, rising 4.8 K/hr, suggests warming tau=41.6 hrs, projected to reach dew point Tuesday May 11 at 8 am. Probably should put more gas in CVJ. |
| 1200 | Matt enters lab |
| 1200 | IVC = 190 mbar, 0.31 bar on mechanical gauge |
| 1200 | MC(Cernox) = 104.1 K |
| 1205 | Stop pumping mixture to dump. Dump (G2) = 730.8 mbar. (Later at 12:40, before turning off the 3He pump, it had risen to 731.8 mbar.) |
| 1205 | Again compare gas from IVC to N2 by comparing the readings on the two gauges - it looks like N2, must be very little He (because pressures above 0.05 bar or so of He cause the Pfeiffer gauge to saturate) |
| 1220 | Start gently pumping IVC with Scroll Pump. This stalls the warming of the MC. |
| 1230 | IVC < 0.1 mbar, switch to pumping with Turbo |
| 1235 | Recovery = 0.18 cuft/hr. At a guess, Recovery = 433239 cuft. |
| 1305 | Turbo on IVC = 19 nbar. With Turbo valved out for 1 minute, IVC = 0.25 μbar. |
| 1315 | Slowly fill IVC with 0.36 bar N2 |
| 1335 | MC(Cernox)/Sorb = 109.0/224 K |
| 1340 | CVJ = 0.054 mbar |
| 1340 | Let 8.6 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. Vacuum Jacket → 0.30 mbar. |
| 1405 | Recovery = 0.32 cuft/hr. |
| 1445 | MC = 115 K, rising 5.7 K/hr, suggests warming tau=31.4 hrs, projected to reach dew point Monday May 10 at 10:26 am. |
| 1505 | Close recovery valve from MB outlet |
| 1515 | Matt exits lab |
| 1600 | MC = 123 K, rising 6.4 K/hr, suggests warming tau=26.9 hrs, projected to reach dew point Monday May 10 at 00:39 am. |