2021/08/25 (Wednesday)
- Lab in-personnel: Giulia and Derek
| Status | Run 74 in progress. First cooldown after IVC rebuild. |
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| 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. Lead shield erected, 4 walls. Currently both DCRCs are on. | |
| Position of Am source: y = 0.0 mm | |
| 1034 | Tower/MC/Coldplate = 176.2/36.4/192.6 mK, Still = 1.38 K / 0.075 mbar / 0 mW, G1/G2= 297.5/271.6 mbar, 1K Pot = 1.58 K / 20±1 mbar. MB = 64.5%. |
| 1044 | Fill LN2 cold bath. |
| 1052 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 24/5.7/4.3/72 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 510/140/70/1200 e-6. |
| Noise is considerably higher than yesterday. | |
| 1106 | Start 45 min series of 0V/-8V - 0V/-10V 0V/-12V - 0V/-14V (bias applied after 60 sec, then 10 minute wait, increase to -10, then wait other 10 minutes and increase to -12 and again wait other 10 minutes and increase to -14), with 1000 beginning randoms, trigger threshold 95/50/45/270 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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| Series 07210825_1106, increasing the bias every 10 minutes. |
| 1152 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
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| 1304 | Start 45 min series of 0/-12V, -8 (bias applied after 60 sec, then 10 minute wait), with 1000 beginning randoms, trigger threshold 100/85/50/320 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. |
| 1350 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
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| Series 07210825_1304, start -12 V at the very beginning, change to -8 V at 10 minutes. |
| NOTE: looking at the logs from Omni_Logger.vi, the initial bias was applied at 13:02, so this series was actually started 2 minutes late. |
| 1456 | Start 45 min series of 0/-12V, -8 (bias applied after 60 sec, then 10 minute wait), with 1000 beginning randoms, trigger threshold 110/60/50/310 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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| 1611 | Dial HV down to 0V and flash detector for 10 minutes with DCRC1&3 LEDs. |
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| Series 07210825_1456 bias -12 V at 60 seconds then change to -8 V at 10 minutes. |