2021/09/11 (Saturday)
- Lab in-personnel: Giulia and Michael
| 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/ |
|
| Position of Am source: y = 0.0 mm | |
| 1336 | Tower/MC/Coldplate = 92.1/35.2/189.9 mK, Still = 1.34 K / 0.070 mbar / 0 mW, G1/G2= 287.5/268.5 mbar, 1K Pot = 1.56 K / 10±1 mbar. MB = 31.9%. |
| 1344 | Fill LN2 cold trap bath |
| 1008 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 16/4.4/3.7/90 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 900/32/85/1600 e-6. |
| Noise is higher than yesterday. | |
| 1405 | Start LHe transfer @ MB = 31.9% |
| 1443 | End LHe transfer @ MB = 88.9 % |
| 1515 | Start 45 min series of +12V/0V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 150/120/40/300 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Use Sequencer script r74_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series. |
| This data seems to have overtriggered |