2023/02/15 (Wednesday)
* 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) |
| 1030 | Tower(RoX)/Tower(U28)/MC(H35)/Coldplate = -/56.1/31.8/145 mK, Still(P1) = 1.14 K / 0.11 mbar / 0 mW, G1/G2 = 127.2/133.7 mbar, 1K Pot(P2) = 30° / 1.65 K / 26 mbar, MB = 31.7% |
| Begin another warm up and pump out | |
| 1345 | Close V6 to stop circulation. |
| 1350 | 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 |
| 1355 | Close 1K Pot needle valve |
| 1356 | Open V3 to let mixture from Condenser side into Still side. |
| 1357 | MC(H35) = 0.40 K |
| 1358 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1359 | Turn on Still and MC heaters to 20 mW each |
| 1400 | 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. |
| 1402 | Fill LN2 cold trap bath |
| 1443 | MC(H35)/1KPot = 3.88/3.81 K |
| 1444 | G1(fridge) = 760 mbar. Open V9 to release mixture into dump to keep it from going over 1000 mbar |
| 1510 | MC temp starts to rise more quickly |
| 1520 | MC(H35)/1KPot = 5.11/4.35 K. Temperatures are relatively flat now. |
| 1524 | Check pressure in IVC: 0.16 ubar. |
| 1525 | Pump out IVC with the turbo pump, mc temp starts to rise again |
| 1750 | MC(H35) = 10.0 K. Turn off MC and Still heaters |