| | Status: MC (Cernox) = 139 K. Overnight it cooled to a minimum of 130 K around 3:00 and then began to warm at a rate of 1.8 K/hour. |
| 0830 | MC = 138 K, IVC = 2.5 mbar, Sorb thermometer still flat at 250 K |
| 0845 | Restart LN2 transfer |
| 0850 | LN2 level resistor = 1.13 Ω |
| 0900 | Trap 1 (G1) = 44.7 mbar after warming overnight. Open to P2: P2 reads off scale (1000). Pump out trap with 4He pump, down to G1/P2 = 0.4/0.030 mbar. |
| 0900 | MC = 137.5 K, Sorb just begins to fall below 250 K. |
| 0915 | MC/Sorb = 134/239 K, IVC = 2.2 mbar, Level resistor = 1.246 Ω |
| 0930 | MC/Sorb = 120/203 K, IVC = 1.9 mbar, Level resistor = 1.307 Ω |
| 0945 | MC/Sorb = 111/178 K, IVC = 1.9 mbar, Level resistor = 1.312 Ω |
| 1000 | MC/Sorb = 103/157 K, IVC = 1.6 mbar, Level resistor = 1.318 Ω |
| 1020 | MC/Sorb = 95/137 K, IVC = 1.6 mbar, Level resistor = 1.322 Ω |
| 1030 | MC/Sorb = 92/132 K, IVC = 1.6 mbar, Level resistor = 1.324 Ω |
| 1045 | MC/Sorb = 89/128 K, IVC = 1.6 mbar, Level resistor = 1.325 Ω. Cease LN2 transfer (a little early, normally go to 1.33 Ω). |
| 1050 | Begin pumping out IVC, first with scroll pump, then with turbo |
| 1055 | IVC = 1.0e-4 mbar |
| 1100 | Perform electrical checkout on detector, all looks good |
| 1105 | IVC pressure pumping/isolated = 3.4e-6/4.6e-5 mbar |
| 1120 | IVC pressure pumping/isolated = 2.5e-6/4.6e-5 mbar |
| 1200 | IVC pressure pumping/isolated = 3.0e-6/4.6e-5 mbar. Stop pumping with turbo, start pumping with leak detector. |
| 1220 | Commence LN2 blowout. Leak rate started at 1.2E-5 mbarL/s. |
| 1245 | Finish filling cold trap dewar. With 792 mbar mixture in dump, begin cold trap cleaning through cold trap 1. |
| 1330 | G3 pressure drops precipitously, so LN2 blowout is finished. LD signal never increased, ends at 1.0e-5 mbarL/s. |
| 1335 | Stop pressurizing main bath: close V2a, V5a, V4a, V1a, and the He valve on the wall system. |
| 1400 | Pumped main bath down to 0.36 mbar and falling, so LN2 is indeed gone. Flush main bath. |
| 1405 | MC/Sorb = 87/127 K |
| 1415 | Add 5.4e-2 mbar He exchange gas to IVC |
| 1425 | Commence first LHe transfer (0.0%). |
| 1430 | Stop cryocleaning mixture. Pump contents of Trap 1 to dump. |
| 1435 | Begin pressurizing LHe storage Dewar. |
| 1441 | Isolate Trap 1, all mixture in dump, G2 = 801.9 mbar. Remove Trap 1 from LN2 Dewar |
| 1450 | MC/Sorb = 83/118 K, IVC = 1.9e-2 mbar |
| 1400 | Conduct a throughput test, and get a throughput rate of 33 mbar/min in G1. (G1 allowed to rise to about 700 mbar and fell to minimum of 40 mbar.) Pump mixture back to dump. |
| note | Throughput rate is low compared to 2015/08/11 and 2015/06/04. But we were a bit warmer each of those previous times. |
| 1505 | MC/Sorb = 73/75 K, IVC = 1.2e-2 mbar |
| 1525 | MC/Sorb = 62/12.3 K, IVC = 1.0e-2 mbar |
| 1535 | MC/Tower = 56/50 K, IVC = 8.6e-3 mbar. Still/ColdPlate = 21/31 K. Sorb/1KPot = 6.9/6.1 K. |
| 1550 | MC/Tower = 50/52 K, IVC = 8.6e-3 mbar. Still/ColdPlate = 18/28 K. Sorb/1KPot = 6.7/5.7 K. |
| 1605 | MC/Tower = 43/50 K, IVC = 8.6e-3 mbar. Still/ColdPlate = 16/24 K. Sorb/1KPot = 6.4/5.4 K. Main bath = 47.2%. |
| 1630 | MC/Tower = 30/35 K, IVC = 8.6e-3 mbar. Still/ColdPlate = 12/18 K. Sorb/1KPot = 5.9/5.0 K. Main bath = 66.2%. |
| 1635 | Looks like Dewar is empty: recovery rate went very high and level stopped increasing. Main bath = 61.1% |
| 1641 | Cease LHe transfer (58.6%). |
| 1645 | MC/Tower = 23/27 K, IVC = 8.6e-3 mbar. Still/ColdPlate = 10/13 K. Sorb/1KPot = 5.7/4.9 K. |
| 1710 | MC/Tower = 15.4/19.6 K, IVC = 7.4e-3 mbar. Still/ColdPlate = 7.3/9.8 K. Sorb/1KPot = 5.5/4.6 K. |
| 1740 | MC/Tower = 10.8/12.5K. Commence turbopumping out IVC exchange gas. IVC = 2.2E-5mbar. Still/ColdPlate = 5.3/7.8 K. Sorb/1KPot = 5.5/4.6 K. |