| | Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55/33/50 |
| | Took some Ba series overnight. Unfortunately none of the series are good, several phonon channels railed. |
| 0910 | Tower = 31.2 mK, Still = 0.090 mbar, G1/G2 = 145/130 mbar, 1K Pot = 1.56 K / 3.4 mbar, Main bath = 40.8% |
| 0915 | Fill LN2 cold trap Dewar |
| 0915 | Restore all phonon channels with relocks |
| 0917 | Start one 30min Ba series at -4/+4 V with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown between series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1021 | Start one 30min Ba series at -4/+4 V with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown between series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1125 | After checking that all phonon traces are still alive, place Ba source back in safe. |
| 1140 | Set all pB & pD channels on all three DIBs to opposite values of their QET biases (i.e. negative for DIBs 1&3, positive for DIB2). Adjust Driver Offsets to unrail channels. |
| 1145 | All channels revived but DIB2 pD shows sporadic burts of ~50mVpp noise on pulses. We've seen it before, though it's unclear if we've ever been the reason it goes away. Attempt zapping SQUIDs to get rid of it. |
| 1200 | After zapping, the sporadic noise is still present on DIB2 pD. Increasing the Feedback Gain for that channel increases the total white noise levels, so the sporadic noise is lost in the newly amplified white noise. The noise is being introduced after the Feedback Gain amplifier in the circuit. Tightening up the connection between DCRC2 and the DSUB connectors had no effect on the sporadic noise. Flipping the QET bias back to the original negative value for DIB2 pD shows pulses w/o this sporadic noise. Switch back and forth between QET biases to confirm that in the normal negative value, pD does not show this noise. Switch the channels so that on DIB2 pA and pC are the ones with the positive (opposite) QET biases and pB and pD are the channels with negative (usual) QET biases. |
| 1220 | Start one 30min background series at -4/+4 V with alternating signs for QET biases with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown before series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1344 | Check phonon pulses. All good. Start one 30min Ba series at -4/+4 V with alternating signs for QET biases with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown before series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1345 | Place Ba source at back of shield at usual height. |
| 1455 | It looks like at ~1425, mhttpd aborted, which caused network errors for MIDAS. Had to kill and restart the MIDAS programs. Sequencer is now finished. Take another series since we only got ~1/2 of what we wanted. All channels alive. |
| 1457 | Start one 30min Ba series at -4/+4 V with alternating signs for QET biases with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown before series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1605 | Commence LHe transfer (30.5%). |
| 1640 | Cease LHe transfer (92.3%). |
| 1645 | Fill LN2 cold trap full. |
| 1655 | Release pressure from Main Bath. |
| 1657 | All channels still alive. |
| 1727 | Start 13 30min Cf series at -4/+4 V with alternating signs for QET biases with FG=5/2/5, OG=3, with 1000 initial randoms, 1000 ending randoms, with 30s flash and 25 minute cooldown before series. Trigger on DIB1 phA with threshold of 30ADC bins, with 150 us pileup cut window. |
| 1730 | Place Cf source near where top of shield would be for overnight data taking. |