2022/09/11 (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 West side of lead/poly shield. |
| NaI trigger window: 7.6-11.2 MeV | |
| Cooled down 3 days ago after fifth 5K pumpout. Taking -4V NaI-triggered data overnight | |
| 0840 | MC base around 30.2 mK, spikes as high as 70 mK |
| 0845 | Check phonon traces. No pulses seen, all baselines elevated, around -0.7 to -0.6 V. Looks like the channels are in the normal state due to He films, as expected. Will have to look at overnight data series to determine when they first went bad. |
| 0900 | HV = -4.1 V, Vtest = -0.1 mV, Ileak = -0.1 uA, Vdet = -4.1 V (99%). |
| 0905 | Dial HV down to 0V using RootSequencer |
| 1428 | MC/Coldplate = 32.0/150 mK, Still = 1.13 K / 0.080 mbar / 0 mW, G1/G2 = 138/128 mbar, 1K Pot = 60° / 1.59 K / 13±1 mbar, MB = 65.3% |
| 1430 | Fill LN2 cold trap dewar |
| I will begin another warm up and pump out | |
| 1433 | Close V6 to stop circulation. |
| 1439 | V6 is now fully closed (light is off on IGH, Still pressure is rising, Condenser pressure falling). Turn off 3He pump |
| 1440 | Close 1K Pot needle valve |
| 1445 | Open V3 to let mixture from Condenser side into Still side. |
| 1450 | MC = 0.45 K |
| 1450 | Turn on Still and MC heaters to 20 mW each |
| 1455 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1500 | 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. |
| 1530 | MC/1KPot/sorb = 3.54/3.45/4.3 |
| 1530 | G1(fridge) = 535 mbar. Open V9 to release mixture into dump |
| 1625 | MC temp starts to rise more quickly |
| 1640 | MC/1KPot = 5.65/4.35. Temperatures are relatively flat now. |
| 1640 | Check pressure in IVC: 0.10 ubar. Start pumping out IVC with turbo pump |
| 1650 | MC temp rising |
| 1837 | MC/1KPot = 10.0/>7 K. Turn off MC and Still heaters |