2017/05/02 (Tuesday)
| Setup: DIB1/3/4 → 3.2 MHz filters 3/1/2 → cable 3/1/2 →gender changer 3/1/2 → HVConn 1/3/2 → HV 1/2 → DCRC55/DCRC33 | |
| PuBe source in paraffin barrel behind shield (west side) | |
| Took NaI-triggered data overnight @50V, looks OK | |
| 0840 | HV = 50.01 V, Vtest = 1.1 mV, nice and stable. Vdetector = 49.5 V |
| 0840 | Tower = 32.9 mK, Main bath = 75.1% |
| 0845 | Fill LN2 cold trap bath. |
| 0910 | Stop data sequence early, with one series left to go Turn off MIDAS programs, then disable DCRC4, then make DCRC1 timing master, then restart programs. We'll try taking a self-triggered calibration series in this mode to see if we can improve the DAQ read efficiency, which has only been about 40% in this mode. |
| 0913 | Start 1 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/4)/(3/5/4), OG = 4/2, QET biases = table from Apr 28 with 1000 beginning randoms, no flashing, and a 22ADC bin threshold trigger on DCRC2 pD (Side1 pF). DCRC4 is disabled so no information from NaI setup. |
| 1105 | Dial HV down to 0V |
| 1105 | Tower/MC/Coldplate = 33.0/30.7/190 mK, Still = 1.2 K / 0.110 mbar, G1/G2 = 235/220 mbar, 1K Pot = 1.681 K / 26 mbar. Main Bath = 71.6%. |
| 1120 | Start 30 minute bake with DCRCs 1&2 |
| 1225 | Dial HV up to 65V. After 10 minutes dial down to 50V. |
| 1240 | Get all channels working. DCRC2pD(Side1pF) had “hairy” pulse peaks but reducing Frontend Gain from 4 to 3 fixed it. |
| 1250 | HV = 50.01 V, Vtest = 1.9 mV → Vdetector = 49.2 V Tower has mostly settled, 33.2 mK |
| 1255 | Start 1 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/4)/(3/5/3), OG = 4/2, QET biases = table from Apr 28 with 1000 beginning randoms, no flashing, and a 22ADC bin threshold trigger on DCRC2 pD (Side1 pF). DCRC4 is disabled so no information from NaI setup. |
| 1304 | Increase DCRC2pD trigger threshold from 22 to 25. It's triggering too much. |
| 1309 | Still triggering too much, don't know what's wrong. Increase threshold from 25 to 30. |
| 1313 | Still triggering too much, increase threshold from 30 to 35. |
| 1316 | Still triggering too much, increase threshold from 35 to 50. |
| 1400 | Stop MIDAS programs, re-enable DCRC4, set DCRC1 to timing slave (DCRC4 is master), restart programs. |
| 1400 | Seeing tufts of hair at the top of DCRC2pD(Side1pF) pulses. Set Frontend Gain down from 3 to 2. |
| 1405 | Start 20 1-hour data series of 1-sided 50V HV coincidence data with Frontend Gain = (20/20/5)/(3/5/2), OG = 4/2, QET biases = table from Apr 28, with 1000 beginning randoms, no flashing, and a 1500ADC bin threshold trigger on DCRC4 pA (TTL signal) Running OR trigger of NaI detectors with PuBe source on west side of shield. NaI detector C has 311 mV threshold and detector B has 288 mV threshold |
| 1712 | Fill LN2 cold trap full. |