2022/09/01 (Thursday)
- Lab in-personnel: Matt, Giulia
| 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 | |
| Third day at base after third 5K pumpout. | |
| Taking -85V NaI-triggered data overnight. But most of it is no good. | |
| 0820 | HV = -92.9 V, Vtest = -21.7 mV, Ileak = -23.9 uA, Vdet = -83.3 V (90%). |
| 0820 | Take a look at phonon channels - no pulses, probably helium film has driven them normal. |
| 0825 | Dial HV down to 0V |
| 1030 | Look at DCRC1pD, IbIs suggests it's stuck in the normal state. |
| 1035 | Close V6 to stop circulation. |
| 1100 | Turn off 3He pump |
| 1150 | MC/Coldplate/Still = 0.58/0.79/1.79 K, G1/G2 = 20/21 mbar and flattish. |
| 1155 | Open V3 to connect Condenser and Still volumes. No change in pressure, looks like they had equalized. |
| 1155 | Turn on Still and MC heaters to 20 mW each |
| 1300 | Close 1K Pot needle valve |
| 1335 | MC = 2.5 K, G1(fridge) = 110 mbar |
| 1335 | 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. |
| 1340 | Fill LN2 cold trap bath. |
| 1430 | MC/1KPot = 3.8/4.4 K, G1(Fridge)= 830 mbar |
| 1430 | Open V9 to release mixture pressure into Dump. Cooling effect on MC. |
| 1525 | MC/1KPot/Sorb = 5.93/5.91/7.4 K. Temperatures look pretty flat, probably because the helium in the IVC is anchoring them to the bath. |
| 1545 | Check pressure in IVC: 0.10 ubar. Start pumping out IVC with Scroll pump MC and 1K Pot temperatures start rising |
| 1800 | MC/1KPot/Sorb = 11.5/>7/11.7 K |
| 1800 | Turn off MC and Still heaters |