2021/07/23 (Friday)
- Lab in-personnel: Pramod and Giulia and Matt
| Status | Run 74 in progress. First cooldown aftr 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. | |
| 1123 | Tower/MC/Coldplate = 113.2/34.8/ 192 mK, Still = 1.42 K / 0.075 mbar / 0 mW, G1/G2= 284.1.6/262.8 mbar, 1K Pot = 1.62 K / 20±1 mbar. MB = 32.1%. |
| 1130 | Fill LN2 cold trap bath. |
| 1145 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 1.69/1.09/1.62/4.57 e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 11/2/3.5/34 e-6 |
| These are similar to yesterday. | |
| 1300 | Put Na-22 source back into safe |
| 1310 | Turn on MC heater to 500 μW |
| 1340 | Tower temperature mostly flat. Tower/MC = 0.68/0.73 K. Condenser → 372 mbar and plateaus. |
| 1345 | Start data then abort, need to adjust trigger thresholds. |
| 1350 | Tower = 0.66 K |
| 1350 | Start data then abort, need to adjust trigger thresholds. |
| 1353 | Start 45 min series of 0V/-15V (bias applied after 60 sec), Tower @ 0.66 K, with 1000 beginning randoms, trigger threshold 80/70/60/70 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. |
| 1441 | Dial bias down to 0V and flash detector for 60 seconds |
| 1445 | Turn off MC heater |
|---|---|
| 1605 | Turn on MC heater to 200 μW |
| 1625 | Tower = 250 mK, still rising but leveling off |
| 1625 | Increase MC heater to 250 μW |
| 1655 | Tower has mostly settled, currently 0.31 K. MC = 0.33 K |
| 1656 | Start 45 min series of 0V/-15V (bias applied after 60 sec), Tower @ 0.31 K, with 1000 beginning randoms, trigger threshold 80/70/60/70 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. |
| 1725 | Tower/MC = 0.31/0.33 K |
| 1744 | Turn off MC heater |
| 1747 | Dial bias down to 0V and flash detector for 60 seconds |