| Status | Run 74 in progress. |
| | Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/HV_diverter_board → DCRC50(3)/55(1). Kepco 0-40V supply → HV BNC. No lead/poly shield. |
| 1414 | MB = 61.2% |
| 1500 | Tower = 89.5 mK |
| | Terrible noise in DCRC1qI (q4), other channels look fine |
| 1500 | Noise in DCRC3qI/qO/DCRC1qI/qO = 1.7/1.4/320/2.3 e-6 @ 10 kHz |
| 1508 | Derek enters lab. |
| 1509 | Re-tape the transfer stick cap with duct tape. |
| 1510 | Try a few things - put 5 V on DCRC1qI only, see noise in DCRC1qO, no change in DCRC1qI. Try turning off 15V power - this seems to sort of turn off both channels. Turn it back on, no improvement in noise. |
| 1513 | Tower/MC/Coldplate = 90.7/35.7/180 mK, Still = 1.43 K / 0.130 mbar / 0 mW, G1/G2 = 380/333 mbar, 1K Pot = 1.69 K / 40±2 mbar. |
| 1520 | MB = 59.5% |
| 1522 | Notice small heating spike around 1510 seems to correspond to when I was on top of the ladder taping up the transfer stick. Wonder if there's a connection… |
| 1526 | Fill LN2 cold trap bath. |
| 1527 | Tower temperature was falling and now flattens around 90 mK, may be a small bump there as well. |
| 1530 | Tower temperature is continuing to fall, was probably nothing more the noise in the thermometer. |
| 1540 | Try powercycling DCRC1. No change in noise. |
| | Previously all attempts to fix this sort of noise failed. It always would just go away on its own. |
| 2030 | DCRC1qI noise still bad. 420 e-6 @ 10 kHz |
| 0615 | DCRC1qI noise still bad. 340 e-6 @ 10 kHz |