2017/08/11 (Friday)
| Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/2/3 → gender changer 1/3/4 → DCRC55(1)/33(2)/X(4) | |
| 1120 | Tower = 25.7 mK, Still = 0.055 mbar, G1/G2 = 136/124 mbar, 1K Pot = 1.69 K / 30 mbar. MB = 27.3% |
| 1125 | Fill LN2 cold trap bath |
| 1510 | Close V6 to stop circulation and allow mix to expand into still line |
| 1530 | G1/G2 have fallen to 44/38 mbar, Still has risen to 28 mbar, Tower has risen to 430 mK |
| 1535 | Close 1K Pot speedivalve to stop pumping on pot. Leaving needle valve open. Close V4a and valve to 4He pump. Open 4He outlet to “exhaust” and close recovery valve. Turn off 4He pump. |
| 1540 | 1K Pot has risen to 2.2 K G1/G2 have fallen to 32/26 mbar, Still has risen to 65 mbar, Tower has risen to 500 mK |
| 1545 | Pump Trap 1 contents into dump. First close V1 to isolate fridge, then close V13a, open V9, open V5 to pump Trap 1 to dump. |
| 1600 | G1 has bottomed out at ~1.2 mbar, LN2 Trap 1 is empty. Stop pumping trap out by closing V12a+speedi and V5. |
| 1600 | Check Trap 2 by opening V12b plus speedivalve. As seen before, G1 jumps to 24 mbar when V12b opened but then immediately falls to 2.5 mbar. Pump this to dump through V5. |
| 1605 | 1K Pot has risen to 3.1 K, Still pressure gauge maxed, Tower has risen to 590 mK |
| 1610 | G1 has bottomed out at 1.1 mbar, LN2 Trap 2 is empty. Stop pumping trap out by closing V12b+speedi and V5. Close V9 to isolate 3He pump then turn it off. |
| 1615 | Open V3, V1, and V4 to let mixture from fridge expand into dump. G1 (fridge) = 20 mbar. Decrease in still pressure has slight cooling effect on Tower, 610→590 mK |
| 1620 | DAQ programs triggerfe2, towerfe3_01, dcrc_driver01 are currently off. Disconnect power from DCRCs. |
| 1620 | Turbo pump pressure = 1.4 nbar - this has been pumping on the IVC. Close pump valve. After 10 minutes IVC pressure reads 14 nbar. This is about the same as last run, but it was at a higher temperature at the time, so maybe this time is worse than it was then. |
| 1620 | Turn on MC heater to 20 mW. Also turn on Still heater to 20 mW. Tower temperature and fridge pressure rising. |
| 1625 | 1K Pot has risen to 3.6 K, G1 (fridge) has risen to 40 mbar, Tower has risen to 1.95 K |
| 1630 | Burst of pressure release, G1 50→90 mbar, Tower starts warming more quickly, 1K Pot suddenly cools 3.6→3 K probably from the cold mixture flowing out. |
| 1640 | Turn off MC and Still heaters. (About to leave for collab meeting, don't want to leave these on for days and forget about them) |
| 1640 | Remove LN2 cold trap 1 and trap 2 from bath to let warm up |
| 1645 | G1 (fridge) 155 mbar and flat, Tower = 2.53 K and flat, 1K Pot / Sorb = 3.3/4.2 K and rising slowly |
| 1650 | Switch to Cernox thermometer, LakeShore range 6.32 kΩ, excitation 200 μV. MC(Cernox) = 2.51 K Begin logging temperature on vuk-01 |
| 1705 | MB = 18.8% |