2021/08/27 (Friday)
- Lab in-personnel: Giulia and Derek
| 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. Lead shield erected, 4 walls. Currently both DCRCs are on. | |
| Position of Am source: y = 0.0 mm | |
| 0838 | Tower/MC/Coldplate = 107.3/33.4/191.3 mK, Still = 1.37 K / 0.070 mbar / 0 mW, G1/G2= 292.3./270.0 mbar, 1K Pot = 1.57 K / 20±1 mbar. MB = 71.7%. |
| 0846 | Fill LN2 cold bath. |
| 0848 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 12/2.3/2.1/49 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 134/17/21/380e-6 |
| Noise is slightly better than yesterday. | |
| 0849 | Start 45 min series of 12V/0V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 70/60/40/200 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. |
