2015/10/07 (Wednesday)
| 0911 | Fill LN2 cold trap full. |
|---|---|
| Overnight status: no data taking (because something is wrong with DIB1pA), Cf source near detector for activation. DCRCs powered. Tower temperature stable. | |
| 0917 | Tower/MC(H35)/MC sensor/Cold Plate = 30.9/25.8/39/145 mK, Still = 1.13 K / 0.11 mbar, G1/G2 = 212/188 mbar, 1K Pot = 1.73 K / 22 mbar, Main bath = 65.9% |
| 0925 | Remove Cf source from fridge. |
| 1030 | Get set up to take Frontend Gain sweeps now that DIB1 pB is back in action. |
| 1130 | Adjust Frontend Gain = 15/5/15 DAQ file to allow for new Driver Offsets. |
| Use the following phonon thresholds: |
| Phonon Thresholds | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB 1 | 50 | 50 | 50 | 50 |
| DIB 2 | 50 | 50 | 50 | 60 |
| DIB 3 | 60 | 80 | 55 | 50 |
| 1142 | Start FG = 15/5/15 data series of 1000 randoms at 0V Qbias. |
|---|---|
| 1146 | Stop data. Set -/+4V Qbias and Start 1000 more randoms at same FG settings. |
| 1150 | Stop data. Flash 30s. |
| 1225 | Setting Frontend Gain = 30/10/30 causes several channels to show ridiculously fat noise (high frequency). Keep going despite the noise. |
| Set new phonon thresholds: |
| Phonon Thresholds | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB 1 | 60 | 80 | 200 | 80 |
| DIB 2 | -‡ | 400 | 100 | 150 |
| DIB 3 | 70 | 1100 | 150 | 200 |
| ‡ | DIB2 pA could not be unrailed when FG was set to 10. |
|---|
| 1305 | Start 1000 random data series at FG = 30/10/30 at 0V Qbias. |
|---|---|
| 1620 | Tower temperature has raised slightly to ~32.5mK. After reverting the boards to their usual Frontend Gains and Driver Offsets (FG=5/2/5), the channels are all back and looking good, and the Tower temperature has begun cooling back to ~31mK. Using the Threshold Settings from Friday. |
| 1635 | Place Cf source inside shield near top of fridge for overnight Cf data taking. |
| 1641 | Start 21 cycles of 15min Cf data series at -/+2V with 1000 initial randoms, 2000 events/file, Frontend Gains = 5/2/5, Output Gain = 3, with 30s flashing and 30min cooldown in between series. |
| 1730 | Fill LN2 cold trap full. |
| 1733 | Main bath 53.3% |