2021/08/16 (Monday)
- Lab in-personnel: Giulia and Zach
| 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/Source_mover_board+HV_diverter_board → DCRC50(3)/55(1). Kepco 40V supplye → HV BNC. No lead/poly shield. Currently both DCRCs are on. | |
| Position of Am source: y = 0.00 mm | |
| 1001 | Tower/MC/Coldplate = 82.1/34.8/ 190.2 mK, Still = 1.37 K / 0.075 mbar / 0 mW, G1/G2= 289.0/263.0 mbar, 1K Pot = 1.59 K / 20±1 mbar. MB = 38.0%. |
| 1016 | Fill LN2 cold bath. |
| 1048 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 1.5/1.2/1.4/6.2 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 6.0/2.0/1.8/20.0e-6 |
| Noise was almost the same at 10kHz and slightly higher at 3kHz than yesterday. | |
| 1356 | Start 45 min series of 0V/-9V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 60/40/120/90 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. |
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| 07210816_1356. DCRC1qI threshold a little to high, should probably be ≤75 |
| there was some confusion over qI/qO, so DCRC1qI threshold was set at 120, thought it was at 90. So, probably it could be a bit higher than 75 and still be OK, maybe as high as 100. |
| but we can still see the pattern. Expected this to be higher than before, but it's actually lower. |
| 1442 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
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| The first flash was done with bias present on accident. | |
| 1512 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. This is the second flash. |
| 1406 | Begin LHe transfer @ MB = 32.1 % |
| 1420 | Forgot to lower the transfer stick further into the dewar, so the transfer was going slow. Lowered it (probably too quickly) and the pressure spiked to a peak of ~8 psi and there was some bubbling at the stripline elbow on top of the fridge (?). |
| 1459 | End LHe transfer @ MB = 90.0 % |
| 1656 | Started another series of 0V/-12V for just a few seconds and it was still triggering had to dial HV down to 0V, waited for about twenty minutes before starting another series with adjusted thresholds. Thus, the detector may not be fully neutralized in this data series. |
| 1725 | Start 45 min series of 0V/-12V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 200/150/75/220 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. |
| Note again: above series was done without flashing first. | |
| 1812 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
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| 07210816_1725 |