2021/08/06 (Friday)
- Lab in-personnel: Giulia, later 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 = -10.02 mm | |
| 0912 | Tower/MC/Coldplate = 139.2/35.4/191.9 mK, Still = 1.39 K / 0.075 mbar / 0 mW, G1/G2= 276.7/256.4 mbar, 1K Pot = 1.61 K / 20±1 mbar. MB = 36.7 %. |
| 0931 | Fill LN2 cold trap bath. |
| 0936 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 3.3/2.6/2.4/18e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 33/4.2/3.6/55 e-6 |
| Noise much lower than yesterday. Makes you wonder whether the heating from the source move yesterday somehow “fixed” it. | |
| 1250 | Start 47 min series of 0V/-12V (bias applied after 60 sec), y_Am = -10.02 mm, with 1000 beginning randoms, trigger threshold 40/40/35/60 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. |
| 1340 | Dial bias down to 0V and flash detector for 10 minutes |
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| 07210806_1250 |
| As seen above the q4 data at 0/-12V looks very similar at y = -10 mm to the y = 0 mm data from two days ago. Good! Let's move the source again. | |
| 1508 | Do mvNwait -4steps×151 times, 40 second wait, with dwell = 40 and power = 6.8 V. (Around 5.93 mm/hour) This sequence will take 1hour40min40sec and will move the source a total distance of 9.96 mm. Should end at 4:48 pm. After several moves Tower is around 1.75 K like the last time. |
| 1601 | Start LHe transfer @ MB = 26.5% |
| 1647 | End LHe transfer @ MB = 93.6% |
| 1650 | Move sequence ends, a little late. |
| 1750 | Tower/MC = 209/37.8 mK and cooling |