2022/04/20 (Wednesday)
- Lab in-personnel: Matt
| Status | Run 76 in progress |
|---|---|
| Setup | Cables 2/3/1 → diverter/nothing/nothing → Side2-readout HV CONN 1/3/2 → HV 1(L)/2(R) → DCRC50(3)/DCRC55(1), DCRC33(2)→HV control, NaI trigger signal → DCRC52(6) |
| 0810 | QET biases are set to dP/dI=0.7uV based on yesterday's IbIs. Adjust offsets so baselines are around -0.85 V |
| 0820 | MC/Coldplate = 28.5/140 mK, Still = 1.09 K / 0.110 mbar / 0 mW, G1/G2= 120/120 mbar, 1K Pot = 18° / 1.57 K / 11±1 mbar |
| 0834 | Dial HV up to 114.7 V using RootSequencer for prebias. Set it to rise about 5 V/s with 0.25 second steps. |
| Phonon baselines go up a little but pulses still look good | |
| 0839 | After 5 minutes dial HV down to 99.9 V |
| 0842 | Start 99.8 V data series after 5 min 15% prebias, 51 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10. Start series with the Start Button. |
| 0935 | Dial HV down to 0V after data series ends |
| 1542 | Begin LHe transfer @ MB = 27.2% |
| 1610 | Fill LN2 cold trap bath |
| 1625 | End LHe transfer @ MB = 95.6% |
Analysis of today's 100V Side2 data:
- It isn't nearly as easy to resolve the calibration lines as in Run75. Maybe because of the source position? It's straddling pC and pD over Side2.
- Since I can't resolve the 14keV line I can't measure the noise width the same way I did in Run75
- Comparing the uncalibrated noise widths and the position of the 60keV line between runs, it looks like the noise width in the new series is only 58% as wide as the Run75 series, normalized to 60keV peak position
- Since the Run75 series had noise width 4.7 eVee, that suggests the noise width in this series is only 2.75 eVee
