2015/09/16 (Wednesday)
| Current setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → → DCRC55/33/50. | |
| Overnight: no source; taking data overnight, last flash at 23:25 last night. All phonon channels still look good. | |
| 0905 | Fill LN cold trap Dewar |
| 0910 | Tower/MC(H35)/MC sensor/Cold Plate = 31.0/25.3/41.0/158 mK, Still = 1.27 K / 0.080 mbar, G1/G2 = 155 mbar, 1K Pot = 1.72 K / 22 mbar, Main bath = 21.0% |
| 1000 | All phonon channels still showing regular pulses. Put Cf source in shield near detector in preparation for Cf data. Choose Top of Shield for source placement. |
| 1005 | Set phonon thresholds to same values as yesterday. |
| Set DAQDAQ2 to take: |
- 15 minute series of -/+2V then -/+4V data
- 30s flash and 30min cooldown in between series
- 2 cycles of these series
- Frontend Gain for DIB1/2/3 set to 5/2/5
- Output Gain set to 3 for all DIBs
- OR trigger set across all phonon channels
- 1000 initial randoms, 2000 events/file
| 1010 | Start data series with Cf source. After randoms, rate starts to bog down. Quickly pull source up ~0.5 inches to position just underneath top of shield. Rate now ~12Hz. |
|---|---|
| 1103 | During data set that started at ~1057 rate drops to ~1.5Hz. Stop DAQDAQ. Increase phonon thresholds by 10 ADC bins each to lower trigger rate. Test run shows improved trigger rate of ~14Hz. |
| 1115 | Aborted data series: Run DAQDAQ for 1 more cycle of 15 minute runs of -/+2V and -/+4V data at same settings. |
| DIB2 pB railed. Stop run. Relock, but it doesn't help. Set offset back to 0.30 like yesterday, which brings the channel back at ~-0.7V. | |
| 1210 | Midas test done. Check pulses. Some railed → reload settings. See strong ~300Hz sinusoidal noise on all DIBs. ~100mVpp on DIB3 and ~20mVpp on other two DIBs. |
| 1215 | Noise is weaker now even as I went through and measured the Vpp on all the DIBs. Leave it for a while longer till it “resolves” itself. |
| 1230 | Noise much less now (no longer sinusoidal). |
| Take Cf data: Start DAQDAQ for 2 cycles at same settings. | |
| No channels railed during randoms. After randoms, event rate ~12Hz. |
| 1600 | Pulses look good. No large noise features. |
|---|---|
| 1625 | Commence LHe transfer (7.2%). |
| 1735 | End LHe transfer (72.1%). |
| 1740 | Take Cf data: Set DAQDAQ overnight to take 4 cycles of the -/+2V & -/+4V data series with same settings as before. |
| 1810 | Fill LN2 cold trap full. |