2021/08/09 (Monday)
- Lab in-personnel: Giulia and Matt
| 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 = -30.00 mm | |
| 0958 | Tower/MC/Coldplate = 71.4/35/ 191 mK, Still = 1.38 K / 0.08 mbar / 0 mW, G1/G2= 272.6/256.3 mbar, 1K Pot = 1.61 K / 20±1 mbar. MB = 60.9%. |
| 1011 | Fill LN2 cold bath. |
| 1037 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 1.3/1.1/1.4/3.8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 5.6/1.4/1.7/11.2 e-6 |
| Noise is lower than last time. | |
| 1049 | Start 49 min series of 0V/-12V (bias applied after 60 sec), y_Am = -30.00 mm, with 1000 beginning randoms, trigger threshold 50/50/50/70 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. |
| 1140 | Dial bias down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs |
| 1159 | 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 1:40 pm. Mean Tower temperature settles around 1.78 K during move. |
| 1341 | Move sequence ends, Tower starts cooling |
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| 07210809_1049. No line seen in q4, consistent with source being over q3 instead. |
| 1600 | Tower = 96 mK, still cooling slowly. MC = 35.1 mK |
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| 1615 | Start 46 min series of 0V/-12V (bias applied after 60 sec), y_Am = - 40.03 mm, with 1000 beginning randoms, trigger threshold 50/50/40/70 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. |
| Data looks OK, so let's send the source all the way back to y=0 | |
| 1718 | Do mvNwait +4steps×607 times, 40 second wait, with dwell = 40 and power = 6.8 V. (Around 5.93 mm/hour) This sequence will take 6hour44min40sec and will move the source a total distance of 40.03 mm. Should end at 12:02 am. Mean Tower temperature 1.68-1.76 K during move |
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| 07210809_1615. We see the line now in q2, no line in other channels. |
