2021/08/15 (Sunday)
- Lab in-personnel: Giulia
| Status | Run 74 in progress. First cooldown after 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. | |
| Position of Am source: y = 0.00 mm | |
| 1233 | Tower/MC/Coldplate = 113.7/36.4/ 189.3 mK, Still = 1.29 K / 0.075 mbar / 0 mW, G1/G2= 295.9/265.9 mbar, 1K Pot = 1.59 K / 20±1 mbar. MB = 68.6%. |
| note: above temperatures taken while Tower was still cooling after what looks like a flash done at 11:40, maybe by accident. Tower was at 86 mK before that. | |
| 1246 | Fill LN2 cold bath. |
| 1246 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 1.7/1.1/1.3/6.2 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 5.2/1.8/1.8/14e-6 |
| Noise is at the lowest level of this week. | |
| The detector seemed to go into a new “state” on Friday with stronger impact ionization. We'll retry 0/-9V data to see how strong it is. | |
| 1339 | Start 45 min series of 0V/-9V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 70/70/80/110 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. |
| 1425 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
| The data series from today seems to have been overtriggering, we should redo it. |