| | Setup: DIB1/3/4 → 3.2 MHz filters → cables 1,2,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3) |
| 0910 | Tower/MC/Coldplate = 31.8/34.5/216 mK, Still = 1.33 K / 120 μbar, G1/G2 = 165/160 mbar, 1K Pot = 1.73 K / 45 mbar. MB = 25.2%.
Boiloff rate: closer to slow- than fast-mode |
| 0910 | Return Cf source to safe. |
| 0915 | Fill LN2 cold trap bath. |
| 1007 | Commence LHe transfer (22.5%). |
| 1112 | End LHe transfer (77.8%). |
| 1132 | Release pressure from main bath |
| 1245 | Release pressure from main bath |
| 1545 | Hook up 0-1kV HV supply to HV board. As soon as it is plugged in the DCRC1 channels rail, then don't show any pulses at their operating QET biases. DCRC2 channels are OK except pD has some ugly noise. |
| 1547 | Flash detector for 30 seconds. (I had actually meant to try zapping it but I got confused…) |
| 1600 | Tower has cooled to 34, still cooling. Now zap the SQUIDs. |
| 1640 | The DCRC1 channels were still showing no pulses. Looked for operational QET bias values using the previous method: step down bias 1 μA at a time until it falls into s/c, then choose a value 5 μA above the lowest transition value. Except for DCRC1pC: the lowest transition value was 185 but 190 was in the strong oscillatory region, so instead we set this to 188 μA. |