2021/02/19 (Friday)
- Lab in-person: Matt
- Virtual partner: Derek
| Status | Run 74. Started circulation yesterday. |
|---|---|
| Setup: DIB1/2+acc → SL 41/43 → 3.2 MHz filters → cables 2/3 → nothing/motor_board+HV_board → DCRC50(3)/55(1). No lead/poly shield. | |
| 0955 | MC(H35) = 31.2 mK, Still = 0.140 mbar, G1/G2 = 78/73 mbar. 1K Pot = 40° / 1.72 K / 80±10 mbar |
| 1040 | Looked at the channels a bit with the Pulse Viewer. Can see noise on all channels. Tried biasing and setting a trigger - didn't really see pulses. MC temperature rose a little. |
| let's try a flash, see if the LEDs work. | |
| 1040 | Flash LEDs on DIBs 1&3 for 30 seconds. MC peaks at 63 mK. That's not very high. |
| 1055 | Try turning on all 4 LEDs and leaving them on. Note - current is set to 0.6 mA. Temperature is rising, though not super-fast. I guess I'm used to looking at Tower though, not MC. After 5 minutes MC → 150 mK. |
| 1100 | Turn off LEDs. |
| 1135 | MC(H35) = 31.7 mK, within 0.5 mK of base. |
| 1200 | MC(H35) = 31.3 mK, within 0.1 mK of base. |
| 1315 | Matt enters lab |
| 1320 | Tower/MC/Coldplate = 126/31.2/187 mK, Still = 1.51 K / 0.140 mbar / 0 mW, G1/G2= 78/74 mbar, 1K Pot = 1.72 K / 80±10 mbar. |
| Tower is surprisingly warm compared to last run. Coldplate and Still are also significantly warmer. | |
| 1325 | MB = 20.6% |
| 1355 | Begin LHe Transfer, MB = 20.0% |
| 1405 | Fill LN2 cold trap bath |
| 1431 | Finish LHe Transfer, MB = 89.8% |
| 1450 | 1K Pot temperature and pressure fell a bit during the transfer. Tower temperature is rising after the transfer, now at 200 mK and climbing. Reminiscent of Run 73. Luckily it doesn't matter as much for this run. |
| 1450 | Tower/MC/Coldplate = 237/32.0/194 mK, Still = 1.46 K / 0.130 mbar / 0 mW, G1/G2= 74/71 mbar, 1K Pot = 1.68 K / 45±2 mbar. |
| 1500 | Tower/MC/Coldplate = 284/32.8/195 mK |
| 1515 | Tower/MC/Coldplate = 338/32.8/192 mK Tower temp continues to rise but it looks like it's leveling off |
| 1520 | MB = 89.5% |
| 1525 | Tower peaks at 343 mK, then begins to fall |
| 1540 | Tower/MC/Coldplate = 319/33.7/186 mK |
| 1545 | Matt exits lab |
| 1620 | Tower = 182 mK and settling |
| 1625 | Matt Fritts body temp = 96.5 °F |
| Let's take some 0-Volt data. We can compare the traces to Run 67 data. And we can try to process it, get that set up. | |
| 1634 | Start 5min series of 0V data, with 1000 beginning randoms, no trigger, 5 Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). |