2015/06/12 (Friday)
| 0754 | Detector was being flashed overnight via MIDAS. During flashing, Tower = 320 mK, G1/G2 = 200/195 mbar, Still = 0.14 mbar. Flashing stopped automatically at 04:05. |
|---|---|
| 0755 | MC/Tower = 26.5/32.5 mK, Cold plate = 145 mK, Still = 1.12 K / 0.11 mbar, G1/G2 = 170/160 mbar, Main bath = 69.5% |
| 0803 | Fill LN cold trap Dewar |
| 0804 | Tried to connect via Putty to DCRCs but apparently locked out by MIDAS. Detector Control vi is responsive (it's using port 5000, MIDAS used ports 5001&5002). MIDAS seems to have left the DCRC settings at some default rather than returning them to original (gains 5/1, offset 0, SQUID 0/0, QET 0, charge 0/0). |
| 0811 | With some inference from the procedure on the wiki, stopped MIDAS programs in this order: Logger, triggerfe2, dcrc_driver01, towerfe3_01. This restored DCRC communications via Putty. |
| 0829 | Reset all SQUID settings and QET biases, establish timing link, apply -3.5/3.5 V bias. Pulses seen in all 12 phonon, 4 charge channels. Tower remains at 33 mK. |
| 0848 | Set all Front End Gains to 50 and Output Gains to 7 on the Rev C boards (DIB1&2) and 8 on the Rev C.1 boards (DIB3). Set Driver Offsets to values that put the pulse baseline at about -0.8 V: |
| Driver Offsets for Front End Gain = 50, Output Gain = 7 or 8 | ||||
|---|---|---|---|---|
| DIB | pA | pB | pC | pD |
| DIB1 | 0.016 | -0.006 | -0.004 | -0.074 |
| DIB2 | 0.018 | -0.036 | -0.072 | 0.008 |
| DIB3 | -0.040 | 0.026 | 0.006 | 0.050 |
Here are the SQUID settings and QET bias for DIB1 pD (DCRC31), the channel that reappeared (these will also be copied back to the older tables):
| DIB1 pD DCRC31 SQUID/QET Settings | ||||
|---|---|---|---|---|
| Channel | Bias (mA) | Lockpoint (mV) | Vpp | QET bias (μA) |
| D | 83.99 | 3.12 | 468 | -73 |
| 1520 | Commence gains sweep data taking: 8 data series each of length 10 minutes, taken at -/+3.5 V bias, interspersed by 6-second flash and 20-minute cooldown periods. OR trigger on phonon channels each with a threshold of 50 ADC Bins. Gains and offsets used included in table below |
|---|
| Data Series | FrontEnd Gain | Output Gain | DIB1 Driver Offset (A/B/C/D) | DIB2 Driver Offset (A/B/C/D) | DIB3 Driver Offset (A/B/C/D) |
|---|---|---|---|---|---|
| 1 | 5 | 1 | 0.032/0.018/0.022/0.086 | 0.138/0.044/-0.014/0.030 | -0.140/-0.078/-0.098/-0.136 |
| 2 | 5 | 2 | 0.024/0.008/0.010/0.094 | 0.166/0.040/-0.040/0.020 | -0.084/-0.020/-0.042/-0.076 |
| 3 | 5 | 4 | 0.018/-0.002/0.000/0.100 | 0.186/0.038/-0.060/0.012 | -0.056/0.008/-0.012/-0.046 |
| 4 | 5 | 7* | 0.016/-0.006/-0.004/0.100 | 0.200/0.036/-0.072/0.008 | -0.040/0.026/0.006/-0.028 |
| 5 | 50 | 1 | 0.032/0.018/0.022/0.086 | 0.138/0.044/-0.014/0.030 | -0.140/-0.078/-0.098/-0.136 |
| 6 | 50 | 2 | 0.024/0.008/0.010/0.094 | 0.166/0.040/-0.040/0.020 | -0.084/-0.020/-0.042/-0.076 |
| 7 | 50 | 4 | 0.018/-0.002/0.000/0.100 | 0.186/0.038/-0.060/0.012 | -0.056/0.008/-0.012/-0.046 |
| 8 | 50 | 7* | 0.016/-0.006/-0.004/0.100 | 0.200/0.036/-0.072/0.008 | -0.040/0.026/0.006/-0.028 |
* RevC boards (DCRC31 and 33) can apply an Output gain of 7, but RevC.1 boards (DCRC 50) apply an output gain of 8.
| 1650 | Abort data taking after noticing an error in the configuration files. Fix and re-save errors. |
|---|---|
| 1658 | Commence gains sweep data taking: 8 data series each of length 10 minutes, taken at -/+3.5 V bias, interspersed by 6-second flash and 20-minute cooldown periods. OR trigger on phonon channels each with a threshold of 50 ADC Bins. Gains and offsets used included in table above. |
| 1700 | Fill LN2 cold trap full. |