2022/09/07 (Wednesday)
- Lab in-personnel: Zach, 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 3 days ago after fourth 5K pumpout. | |
| 1300 | MC/Coldplate = 30.2/150 mK, Still = 1.14 K / 0.110 mbar / 0 mW, G1/G2 = 150/137 mbar, 1K Pot = 45° / 1.60 K / 15±1 mbar, MB = 66.7 % |
| 1305 | Fill LN2 cold trap bath |
| 1320 | MC base = 30.2 mK with spikes mostly peaking below 45 mK but some over 100 mK |
| 1325 | As was the case last night, no channels are showing any pulses. Some baselines very elevated, others way off, maybe lost lock. |
| Let's warm up and pump out again. | |
| 1325 | Close V6 to stop circulation. |
| 1335 | V6 is now fully closed (light is off on IGH, Still pressure is rising, Condenser pressure falling). Turn off 3He pump |
| 1335 | Close 1K Pot needle valve |
| 1340 | Open V3 to let mixture from Condenser side into Still side. |
| 1345 | MC = 0.49 K |
| 1345 | Turn on Still and MC heaters to 20 mW each |
| 1350 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1355 | 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. |
| 1423 | G1(fridge) = 550 mbar. Open V9 to release mixture into dump |
| 1423 | MC/1KPot/sorb = 3.6/3.45/4.3 |
| 1502 | MC/1KPot = 3.43/4.34 |
| 1515 | MC temp starting rising more quickly, seems to have gotten out of the “mode” that it was in when we opened V9 |
| 1537 | MC/1KPot = 5.56/4.35. Temperatures are relatively flat now. |
| 1540 | Check pressure in IVC: 0.10 ubar. Start pumping out IVC with turbo pump |
| 1545 | MC temperature rising. (1K Pot still flattish at 4.35 K, not sure why) |
| 1739 | MC/1KPot = 10.0/>7 K. Turn off MC and Still heaters |