2021/09/08 (Wednesday)
- Lab in-personnel: Giulia and Matt
| 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. Lead shield erected, 4 walls. Currently both DCRCs are on. | |
| Position of Am source: y = 0.0 mm | |
| 0829 | Tower/MC/Coldplate = 124.3/34.0/188.3 mK, Still = 1.27 K / 0.070 mbar / 0 mW, G1/G2= 286.9/266.6 mbar, 1K Pot = 1.57 K / 10±1 mbar. MB = 74.0%. |
| 0836 | Fill LN2 cold trap bath |
| 0825 | At 10kHz noise in DCRC3qI/qO/DCRC1qI/qO = 20.0/3.7/4.0/73 8e-6. This is q3/q1/q4/q2 At 3kHz (peak) noise in DCRC3qI/qO/DCRC1qI/qO = 126/24/17.2/260 e-6 |
| Noise is as slightly higher than yesterday. | |
| 0842 | Start 213 min series of 0V/-8V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 95/50/35/290 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. |
| This data series was a miscommunication - Matt asked Giulia for -8V/0V data, which would be done with the sequencer, but instead she started 0V/-8V data externally biased. | |
| 1215 | Dial HV down to 0V and flash for 5 minutes with DCRC1&3 LEDs. |
| 1330 | There's some problem with cdms1 and cdms3 - the DAQ interface is frozen, and currently you can't log into those machines with x-forwarding, and you can't sudo into spa-u-cdmssoft. So we are kinda stuck. |
| 1610 | Some problems are fixed - sudo works now and I'm able to start MIDAS. But there's some problem with my (Matt's) account, I can't write to my home directory, and this I think is making x-forwarding connections not work for me. I had Jack open a terminal to cdms1 on jiajin with x-forwarding, so now we can get the pulse viewer. (We tried to do it on the fridge computer with PuTTY but this didn't work for Jack for some reason.) |
| 1615 | This problem is now fixed - apparently I had exceeded my quota and couldn't write to my home directory… |
| 1625 | Put Ba-133 source in plastic cup, lower down into shield. Source is at detector level and ~2 inches from the mu-metal shield |
| Tried to start data but it didn't work - I think because I started the sequence without stopping the temporary run. Need to set biases back to 0V and flash. | |
| 1635 | Set Side 1 biases back to 0V and flash DCRC1&3 LEDs for 60 seconds. |
| 1647 | Start 45 min series of +8V/0V (bias applied after 60 sec), with Ba-133 source present, with 1000 beginning randoms, trigger threshold 80/40/35/250 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Use Sequencer script r74_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series. |
| Note: started this series kinda soon after the flash, Tower ~ 150 mK, not quite to base ~ 100 mK | |
| 1735 | Return Ba-133 source to safe |
| 2110 | Start 45 min series of -8V/0V (bias applied after 60 sec), with 1000 beginning randoms, trigger threshold 150/40/30/350 on DCRC3qI/qO/DCRC1qI/qO, 5Hz in-run randoms, with 1.6384 ms pulses (8192 length) and 400 us prepulse (500 length). Use Sequencer script r74_takeandflash_dcrcbias.msl. This flashes for 30 seconds at end of series. |
| this data didn't write, don't know why. | |
| oh - actually it looks like it wrote to /livedata but the lazy logger wasn't running. |
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| 07210908_2110. Charge collection efficiency is surprisingly low. |