2022/01/24 (Monday)
- 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 = 20.01 mm |
| 1034 | Goldman/Tower/MC(H35)/Coldplate = 42.0/80.5/34.1/180 mK, Still = 1.43 K / 0.110 mbar / 0 mW, G1/G2= 265/250 mbar, 1K Pot = 1.60 K / 14±1 mbar, MB = 31.4%. |
| 1048 | Fill LN2 cold trap bath |
| Sensitivity of standard QET bias setting to temperature | |
|---|---|
| Channel | uA/mK |
| DCRC1pA | -0.76 |
| DCRC1pB | - |
| DCRC1pC | -1.21 |
| DCRC1pD | -1.97 |
| DCRC3pA | -1.96 |
| DCRC3pB | -1.13 |
| DCRC3pC | -0.36 |
| DCRC3pD | n/a |
| DCRC4pA | -2.69 |
| DCRC4pB | -1.73 |
| DCRC4pC | -1.12 |
| DCRC4pD | -1.27 |
| 1330 | Goldman = 41.4 mK. Set QET biases to target dP/dI=1.0 uV and adjust driver offsets so baselines ~ -0.9 V |
|---|---|
| 1339 | Start 0V data series, 40 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 1610 | Begin LHe transfer @ MB = 22.4% |
| 1620 | Double-click Arduino Bridge link on desktop. Turn off GwINSTEK power output, then establish communication with the Arduino. (No temperature spike because I turned off the power output.) The turn GwINSTEK power output back on. |
| 1625 | Set Dwell to 40 ms |
| 1632 | 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 1hr40min00sec and will move the source a total distance of 9.96 mm ending at y = 10.05 mm. Should end at 6:12 pm. Tower temperature averages around 0.51 K with familiar oscillations. |
| 1700 | End LHe transfer @ MB = 93.1% |
| 2010 | Goldman = 45 mK and cooling |
| Let's measure Tc's on DCRC3 channels. | |
| 2020 | Worked out again how to edit the ODB from the command line, by entering commands like odbedit -c 'set “/Equipment/Tower01/Settings/DCRC4/Phonon/QETBias (uA)[1]” 0.0' |
| 2030 | Set all QET biases to 0 |
| 2040 | Set up DCRC3 for Tc tests. Set Test Signal to 12 mVpp / 200 Hz. Trigger on test signal. Connect test signal to QETs. Modulation is 10.7/14.5/15.0 mVpp in pA/pB/pC Goldman = 44.0 mK. |
| 2042 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to 500. Turn off LEDs after 3 minutes. Goldman peaked at 1.28 K. |
| 2045 | Modulation is 3.0/3.5/2.8 mVpp in pA/pB/pC Goldman = 350 mK. |
| 2110 | See transitions in DCRC3pA/pB/pC @ 70/69/77 mK |
| 2120 | Set QET biases back into transition and relock SQUIDs where necessary |
| 2125 | Goldman = 47.7 mK and cooling |