| 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 on. Lead/poly shield erected (4 lead walls, 2 poly walls). |
| 0830 | Ruiren temperature = 36.6C |
| 0900 | Ruiren enters lab |
| 0900 | Tower/MC/Coldplate = 95.4/32.2/196 mK, Still = 1.49 K / 0.120 mbar / 0 mW, G1/G2= 237/212 mbar, 1K Pot = 1.63 K / 20±2 mbar. |
| 0900 | refill lN2 cold trap dewar |
| 0930 | Did some troubleshooting of HV problem. Adjusting DCRC2qI from 11.6 to 0V, HV supply varies from 0 to -0.4V, should be 0 to +500V. Will look at this more closely later. |
| 0945 | Ruiren leaves lab |
| 1230 | Matt enters lab |
| 1300 | Disconnect external-control leads from back of Kepco power supply (HV supply). Try dialing up voltage. HV does not go up, stays around 0.4 V. Looks like the power supply is dead. |
| 1320 | Matt leaves lab |