| | Current setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50. |
| | Overnight: Taking background data. Last flash at 6:45. Tower temp stable. |
| 0910 | Tower/MC(H35)/MC sensor/Cold Plate = 31.1/25.7/41.7/157 mK, Still = 1.34 K / 0.095 mbar, G1/G2 = 105/105 mbar, 1K Pot = 1.63 K / 6 mbar, Main bath = 43.7% |
| | 1K Pot temperature and pressure and circulation pressures significantly lower than last week. Probably the pot behavior changed when the bath got very low yesterday. |
| 0920 | Start LHe transfer at 43.7% |
| 0950 | Finish LHe transfer at 88.9% |
| 1022 | Place Ba source behind fridge inside top most part of shield. |
| 1059 | Set phonon thresholds to yesterday's values. |
| 1101 | Start Qbias sweep Ba data 3 cycles of 30 minute series, FG=5/2/5, OG=3, with 1000 initial randoms, 2000 events/file, 30s flash and 25min cooldown in between. The Qbias was swept in the following order: +/-2V, +/-4V, +/-6V, +/-8V, 0V, -/+6V, -/+8V. |
| 1338 | During the third series (+/-6V), the event rate was noticed to oscillate between the typical 15Hz and 1Hz. This was only noticed right at the end of the series, so it's unclear how long this was happening. The data directory for this series only contains 5 files instead of the 12 that are in the directories for the first two series, though. Pull the Ba source slightly higher (directly below the very top of the shield) in hopes of decreasing the strain on the computer. |
| 1410 | During fourth data series (+/-8V), the rate drops low (~2Hz). Modify all phonon trigger thresholds to be 10ADC bins higher. This brings the event rate back up to 15Hz. The new phonon thresholds are below: |