2015/07/03 (Friday)
| status | Flashing overnight, Cf source at detector level. DIB1/2/3 → Filter none/100MHz/3.2MHz → DCRC55/33/50. |
|---|---|
| 0950 | Tower = 298 mK, Still = 2 mW / 0.13 mbar, G1/G2 = 260/240 mbar, 1K pot = 1.69 K / 14 mbar, Main bath = 37.9% |
| 0954 | turn off flashing |
| 1001 | fill LN2 cold trap Dewar |
| 1052 | Trying to set DCRCs. 3KHz 5mVpp oscillation in DIB2qI. Unplug DCRC33. |
| 1105 | Tower base falls from 32.1 to 31.5 mK with DCRC33 off. Repower DCRC33. |
| 1123 | Zap DIB2 SQUIDs. |
| 1140 | remove Cf source |
| Current FrontendGain/OutputGain(setting)/DriverOffset settings | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB1 | 7/1/0.170 | 7/1/0.156 | 7/1/-0.014 | 7/1/0.074 |
| DIB2 | 7/1/0.022 | 4/1/0.036 | 7/1/0.028 | 7/1/0.022 |
| DIB3 | 7/1/-0.074 | 7/1/-0.012 | 7/1/0.198 | 7/1/0.172 |
| 1152 | DIB1 pA and pC keep losing lock. Oscillation in DIB1 phonons, 150 Hz, 5/10/20/10 mVpp in pA/pB/pC/pD. |
|---|---|
| 1202 | try zapping DIB1 SQUIDs |
| 1218 | Now all four DIB1 phonon pulses upside down :(. 150 Hz oscillation seen in all three DIBs, stronges in DIB1pA (15 mVpp) and DIB2 pC (20 mV). Unplug DCRC55 from DIB1. |
| 1239 | Repower DCRC55/DIB1, zap SQUIDs, set timing link |
| 1401 | new driver offsets are closer to “normal”: |
| Updated DriverOffset settings | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB1 | -0.092 | -0.082 | -0.028 | -0.094 |
| 1402 | 1 kHz noise in DIB1 phonon channels |
|---|---|
| 1417 | Begin LHe transfer at 31.5% |
| 1455 | End LHe transfer at 93.7% |
| 1515 | Ugly square wave in DIB1 phonons, 150 Hz, 5/0/10/4 mVpp. |
| 1516 | Set optimal phonon thresholds: |
| Current phonon threshold settings | ||||
|---|---|---|---|---|
| pA | pB | pC | pD | |
| DIB1 | 30 | 25 | 35 | 20 |
| DIB2 | 25 | 20 | 25 | 30 |
| DIB3 | 15 | 15 | 10 | 20 |
| 1520 | flash 30 seconds |
|---|---|
| 1532 | Set to -4/+4 V, start bkg data |
| 1549 | Stop data, set to 0/0 V |
| 1555 | Place Cf source at detector level |
| 1558 | Looks like a lot of channels railed, probably during run. Oscillation on DIB1qI, elevated temperature (was 31 mK, now 32 mK). Looks like DCRCs are in a Bad State. May as well unplug DCRCs. |
| 1620 | Fill LN2 cold trap Dewar |