2022/10/30 (Sunday)
- Lab in-personnel: Zach
| Status | Run 76 in progress |
|---|---|
| Setup | Cables 2/3/1 → diverter/nothing/nothing → Side2-readout HV CONN 1/3/2 → HV 1(L)/2(R) → DCRC50(3)/DCRC55(1), DCRC33(2)→HV control, NaI trigger signal → DCRCX(4) Lead/poly shield fully assembled. Boron-filled socks covering NaI detectors. PuBe behind lead wall on W side of fridge. NaI array trigger thresholds: 7.0 - 11.0 MeV |
| Cooled to base two days ago after eighteenth 5K pumpout. | |
| 1253 | Fill LN2 cold trap bath |
| 1637 | MC/Coldplate = 29.2/148mK, Still = 1.09 K / 0.090 mbar / 0 mW, G1/G2 = 138/133 mbar, 1K Pot = 45° / 1.57 K / 9.0±1 mbar, MB = 22.9% |
| 1643 | Close V6 to stop circulation. |
| 1648 | V6 is now fully closed (light is off on IGH, Still pressure is rising, Condenser pressure falling). Turn off 3He pump |
| 1650 | Close 1K Pot needle valve |
| 1651 | Open V3 to let mixture from Condenser side into Still side. |
| 1652 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1654 | MC = 0.43 K |
| 1654 | Turn on Still and MC heaters to 20 mW each |
| 1700 | 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. |
| 1749 | MC/1KPot = 3.89/3.89 K. G1(fridge) = 769 mbar |
| 1749 | Open V9 to release pressure into the dump. |
| 1826 | MC temp begins to rise more quickly |
| 1839 | MC/1KPot = 6.02/4.36 K |
| 1840 | Check pressure in IVC: 0.063 ubar. Start pumping out IVC with turbo pump. |
| 2020 | Tower = 10.02 K. Turn off MC and Still heaters. |