2023/02/21 (Tuesday)
* Lab in-personnel: Zach
| Status | Run 77 in progress. |
|---|---|
| Setup To Be | Cable 2/1/3 → diverter/nothing/nothing → DCRC50(3)/DCRC55(1)/DCRCX(4) |
| 1338 | Tower(RoX)/Tower(U28)/MC(H35)/Coldplate = -/51.1/32.7/153 mK, Still(P1) = 1.14 K / 0.08 mbar / 0 mW, G1/G2 = 152/152 mbar, 1K Pot(P2) = 30° / 1.62 K / 20 mbar, MB = 24.5% |
| 1342 | Turn off DAQ programs and unplug DCRCs 1,4 & 3 |
| Begin another warm up and pump out | |
| 1358 | Close V6 to stop circulation. |
| 1404 | V6 is now fully closed (light is off on IGH, Still pressure is rising (currently 1.5 mbar), Condenser pressure falling). Turn off 3He pump |
| 1405 | Close 1K Pot needle valve |
| 1405 | Open V3 to let mixture from Condenser side into Still side. |
| 1408 | Begin LHe transfer @ MB = 23.4% |
| 1410 | MC(H35) = 0.48 K |
| 1410 | Turn on Still and MC heaters to 20 mW each |
| 1412 | Close 1K Pot speedivalve, V4a, 4He pump inlet valve. Turn off 4He pump. Close recovery valve to 4He pump outlet. NOTE: remember to open recovery valve when the pump is turned back on. |
| 1413 | Fill LN2 cold trap bath |
| 1449 | Ended LHe transfer @ MB = 93.1% |
| 1502 | MC(H35)/1KPot = 3.86/3.94 K |
| 1503 | G1(fridge) = 744 mbar. Open V9 to release mixture into dump to keep it from going over 1000 mbar |
| 1545 | MC(H35)/1KPot = 5.28/4.32 K. Temperatures are relatively flat now. |
| 1546 | Check pressure in IVC: 0.12 ubar. |
| 1547 | Pump out IVC with the turbo pump, mc temp starts to rise again |
| 1803 | MC(H35) = 10.0 K. Turn off MC and Still heaters |