2022/01/25 (Tuesday)
- Lab in-personnel: Giulia and Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board/nothing → DCRC55(1)/DCRC50(3)/DCRCx(4) Lead shield in place. Am Source y = 10.05 mm |
| 1110 | Goldman = 41.2 mK. Set QET biases to target dP/dI=1.0 uV and adjust driver offsets so baselines ~ -0.9 V |
| 1113 | Start 0V data series, 43 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 1320 | Goldman/Tower/MC(H35)/Coldplate = 41.1/73.8/33.6/182 mK, Still = 1.46 K / 0.120 mbar / 0 mW, G1/G2= 263.5/231.4 mbar, 1K Pot = 1.59 K / 14±1 mbar, MB = 69.5%. |
| 1334 | Fill LN2 cold trap bath. |
| 1515 | Establish communication with the Arduino. Temperature spike since I'm doing this remotely. |
| 1515 | Set Dwell to 40 ms |
| 1521 | 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 1hr41min20sec and will move the source a total distance of 10.02 mm ending at y = 0.03 mm. Should end at 5:02 pm. Tower temperature averages around 0.51 K with familiar oscillations. |
| Gonna try to find Tc in the two channels that I couldn't before, DCRC1pB and DCRC4pA. In both cases I'll set QET bias to 2 uA - this should cause a drop of about 10 mV when they transition from normal to s/c. | |
| 1715 | Goldman = 120 mK and cooling. Set all QET biases to 0, then set QET biases on DCRC1pB and DCRC4pA to 2 uA (which causes noticeable shift). Adjust driver offsets to get both baselines very close to 0.000 V. |
| 1735 | Saw transitions in DCRC1pB, high 87 low 85 mK, and in DCRC4pA, high 78 low 77 mK. |
| 1835 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to 500. Turn off LEDs after 3 minutes. Goldman peaked at 1.28 K. |