2022/09/15 (Thursday)
- 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 to base on Monday, Sixth 5K pumpout. | |
| Channels went normal overnight due to helium films, need to warm up | |
| 1355 | MC/Coldplate = 31.3/150 mK, Still = 1.12 K / 0.075 mbar / 0 mW, G1/G2 = 132/128 mbar, 1K Pot = 45° / 1.59 K / 13±1 mbar, MB = 67.7% |
| 1357 | Fill LN2 cold trap dewar |
| I will begin another warm up and pump out | |
| 1400 | Close V6 to stop circulation. |
| 1405 | V6 is now fully closed (light is off on IGH, Still pressure is rising, Condenser pressure falling). Turn off 3He pump |
| 1405 | Close 1K Pot needle valve |
| 1410 | Open V3 to let mixture from Condenser side into Still side. |
| 1415 | MC = 0.44 K |
| 1415 | Turn on Still and MC heaters to 20 mW each |
| 1419 | Turn off DAQ programs and unplug DCRCs 1&3 |
| 1425 | 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. |
| 1500 | MC/1KPot = 3.72/3.62 |
| 1500 | G1(fridge) = 645 mbar. Open V9 to release mixture into dump |
| 1545 | MC temp starts to rise more quickly |
| 1613 | MC/1KPot = 5.70/4.35. Temperatures are relatively flat now. |
| 1615 | Check pressure in IVC: 0.10 ubar. Start pumping out IVC with turbo pump |
| 1615 | MC temp rising |
| 1810 | MC/Sorb= 10.1/10.2 K. Turn off MC and Still heaters |