2021/08/07 (Saturday)
- 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 = -19.98 mm | |
| 1205 | Tower/MC/Coldplate = 132/35.2/191.5 mK, Still = 1.39 K / 0.075 mbar / 0 mW, G1/G2= 286.9/268.3 mbar, 1K Pot = 1.60 K / 20±1 mbar. MB = 70.1 %. |
| 1227 | Fill LN2 cold trap bath. |
| The Dewar for the N2 fill is empty. | |
| 1243 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 2.6/1.7/2.5/5.9e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 13.2/2.5/3.1/17 e-6 |
| 1702 | Start data then abort, overtriggering |
| 1710 | Start 45 min series of 0V/-12V (bias applied after 60 sec), y_Am = -19.98 mm, with 1000 beginning randoms, trigger threshold 35/35/40/60 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. |
| 1800 | Dial HV down to 0V |
| 1807 | Do mvNwait -4steps×152 times, 40 second wait, with dwell = 40 and power = 6.8 V. (Around 5.93 mm/hour) This sequence will take 1hour41min20sec and will move the source a total distance of 10.02 mm. Should end at 7:48 pm. After several moves Tower is around 1.75 K like the last time. |
| 1820 | Fill LN2 cold trap bath |
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| 07210807_1710, source at y = -20 mm |