2022/09/22 (Thursday)
- Lab in-personnel: Matt
| 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 to base three days ago after eighth 5K pumpout. Taking -80V data overnight. |
|
| 0935 | Check phonon channels - no pulses, looks like they're in their normal states. |
| 1205 | Close V6 to stop circulation. |
| 1210 | Turn off 3He pump |
| 1230 | Close 1K Pot needle valve |
| 1250 | Turn on Still and MC heaters to 20 mW each |
| 1250 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1255 | 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. |
| 1300 | 1K Pot rises to 2.1 K |
| 1330 | Open V3; G1 rises, so apparently Still side was at higher pressure than Condenser side. |
| 1434 | Begin LHe transfer @ MB = 30.4% |
| 1445 | MC reaches 4.1 K then starts rising much faster |
| 1445 | G1(fridge) = 915 mbar. Open V9 to release mixture into dump. |
| 1500 | Fill LN2 cold trap bath |
| 1510 | MC/1Kpot/Sorb = 5.87/4.92/6.2 K and flat |
| 1510 | Check pressure in IVC: 0.086 ubar. Star pumping out IVC with turbo pump |
| 1518 | End LHe transfer @ MB = 94.4% |
| 1710 | MC/1Kpot/Sorb = 10.39/6.66/8.4 K Turn off MC and Still heaters |