2021/08/03 (Tuesday)
- Lab in-personnel: Giulia
| Status | Run 74 in progress. First cooldown aftr IVC rebuild. |
|---|---|
| Tower thermometer is reading high, probably this is a thermometer problem and the actual temperature is much lower. High noise in some of the charge channels. | |
| Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. Currently both DCRCs are on. | |
| 1013 | Tower/MC/Coldplate = 87/34.8/ 194 mK, Still = 1.41 K / 0.075 mbar / 0 mW, G1/G2= 279.4/252.6 mbar, 1K Pot = 1.60 K / 20±1 mbar. MB = 68 %. |
| 1020 | Fill LN2 cold trap bath. |
| 1125 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 1.4/1.1/1.2/4.6 e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 8/1.7/1.7/38 e-6 |
| Noise is quite low today | |
| 1134 | Start series then abort, overtriggering. |
| 1141 | Start series then abort, overtriggering. |
| 1151 | Start series then abort, overtriggering. |
| 1156 | Start 106 min series of 0V/-15V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 50/40/40/90 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Start sequence with Start button. |
| 1345 | The bias looks like it has stayed constant. Let's see if we can measure the test resistor without introducing noise. |
| 1350 | Try connecting HP meter to test resistor. This introduces some weird nasty noise. Note - this will be weird data at the end of this series. |
| 1354 | Dial bias down to 0V and flash detector for 10 minutes |
| Data today shows another “dropout” in the 60keV peak, about 3 minutes after biasing. But there is no indication of any significant fluctuation in bias, it was quite stable. |
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| 07210803_1156 | 07210803_1156 (zoomed out y-axis) |