2020/11/07 (Saturday)
- Lab in-person: Ruiren
- Virtual partner: Matt
| Setup | Run 73. DIB 1/3/4 → Stripline 43/48/41 → pi-filters 1/2/3 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1)-master; DCRC33(2) → HV control. DCRCs off. |
|---|---|
| Status | Warming up. Circulation and 1K Pot stopped two days ago. 1K Pot pumped out, presumably dry, and isolated. All mixture in dump. Fridge and 4He trap isolated. DCRCs, Arduino/motor driver, HV supply all off. Turbo pump still pumping on IVC, no gas in cryostat vacuum jacket. Helium bath boiled off, recovery valve still open. |
| 0837 | Recovery = 404866.325 cuft, 0.11 cuft/hr |
| 0915 | MC(Cernox)/Sorb = 66.5/172.7 K |
todo:
- Stop pumping IVC and let some N2 into it
- Close recovery valve (and stop recovery camera)
- Let some N2 into the IVC
- Remove LN2 Trap 1 from bath
- Check LHe trap and fridge pressures, pump them out
- Check and pump out LN2 Trap 1 when warm
| Ruiren temperature = 36.6 C | |
| 1415 | Ruiren enters lab |
| 1435 | MC(Cernox)/Sorb = 76/194 K |
| 1440 | Let some N2 into IVC. Sorb and MC temperatures rise more quickly. |
| 1437 | Recovery = 404866.88 cuft, 0.077 cuft/hr |
| 1445 | Close MB Recovery valve. |
| 1450 | MC(Cernox)/Sorb = 80.1/207.5 K |
| 1500 | Let total of 0.2 bar N2 into IVC, according to mechanical gauge (140 mbar on Pfeiffer gauge). Close IVC valves. |
| 1520 | Connect vacuum manifold hose to cryostat vacuum jacket port and pump it out with Scroll pump and Turbo pump. |
| 1525 | Let 5.4 mbar N2 gas into vacuum manifold. Then open cryostat vacuum jacket valve to let this into the vacuum jacket. Vacuum Jacket → 250 ubar. |
| 1530 | MC(Cernox)/Sorb = 93.5/295 K |
| 1550 | Remove south wall of lead/poly shield |
| 1550 | Ruiren leaves lab |