2021/09/15 (Wednesday)
- 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/ |
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| Position of Am source: y = 0.0 mm | |
| Tower = 1.52 K, level | |
| 0840 | Tower/MC/Coldplate = 1571/1635/2287 mK, Still = 1.92 K / 0.070 mbar / 0 mW, G1/G2= 289.3/271.2 mbar, 1K Pot = 1.56 K / 10±1 mbar. MB = 39.7%. |
| 0849 | Fill LN2 cold trap bath |
| 1054 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 33/2.7/3.3/40 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 550/32/64/760 e-6. |
| Noise is higher than yesterday. | |
| 1150 | Tower = 1.59 K. It has crept up slowly overnight. Let's apply more heat to get to another temperature to try taking data at. |
| 1155 | Turn on MC heater → 500 uW |
| 1305 | Tower rose to 1.76 K, then fell to 1.69 K again for some reason, then started rising again, now 1.73 K |
| 1310 | Increase MC heater → 2000 uW |
| 1505 | Tower = 1.85 K, rising slowly, 0.04 K/hour |
| 1520 | Reduce MC heater → 1500 uW |
| 1526 | Start 45 min series of +10/0V data (bias applied after 60 sec), at elevated temperature, with 1000 beginning randoms, trigger threshold 120/35/35/300 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. |
| Series starts @ Tower = 1.860 K. (MC = 1.91 K). Ends at Tower = 1.863 K |
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| 07210915_1526.png |
| 1710 | Turn off MC heater Turn off 3He pump |
|---|---|
| 1710 | Start LHe transfer @ MB = 27.8% |
| 1746 | End LHe transfer @ MB = 90.4% |