| | Overnight bake using IR LEDs on DIB4. Tower was steady at 500mK until the bake ended at 0800 |
| 0908 | Tower/MC/Coldplate = 75.3/62/392 mK, Still = 1.3 K / 0.13 mbar, G1/G2 = 144/130 mbar, 1K Pot = 1.67 K / 50 mbar. MB = 18.9% |
| 0918 | Fill LN2 cold trap full. Dewar ran dry. |
| 0930 | Reduce phonon channel trace lengths by a factor of 16. In ms, that's 3.2768→0.2048; in samples, that's 4096→256. In the units that the MIDAS ODB uses, its 8192→512, because it counts half-samples. |
| 0935 | Dial up INSTEK power supply voltage to 30 V on electrode |
| 0937 | Start data series of contact-free/readout=30V/0V -30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold trigger on DCRC1 q[1] = qC. |
| 0941 | Check on BatViewer, seems to be triggering too frequently. Increase trigger threshold from 50 → 70. |
| 0946 | Check on BatViewer, still seems to be triggering too frequently. Increase trigger threshold from 70 → 90. |
| 0950 | Check on BatViewer, still seems to be triggering too frequently. Increase trigger threshold from 90 → 120. |
| 0953 | Check on BatViewer, still seems to be triggering too frequently. Crazy. Increase trigger threshold from 120 → 150. |
| 1005 | Stop the run to investigate. Set beginning of run randoms to 0, turn off logger and start run while watching pulse viewer. Triggering looks fine here. Reducing trigger threshold back to 50 seems about right… |
| 1007 | Start data series of contact-free/readout=30V/0V -30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold trigger on DCRC1 q[1] = qC. |
| 1012 | Check on BatViewer, triggering well now, but on positive DCRC1 QO pulses. Given the bias, and the DCRC, we expect negative pulses here. Could be that it has already lost neutralization and flipped. See 1058. Not sure why the triggering is better now. Could be related to having used the SQUIDTuningGUI. In the past, interactions with the GUI (or multiple instances of it at once) has caused this kind of rapid triggering. |
| 1020 | Stop run. |
| 1022 | Flash for 30s with DIB4 LEDs. |
| 1042 | Start data series of contact-free/readout=30V/0V -30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold trigger on DCRC1 q[1] = qC |
| 1052 | Check on BatViewer, again triggering too frequently. Close SQUIDTuningGUI to see if that helps. |
| 1058 | OOOoooohhh. We've actually been biasing at -30V, so we do expect positive pulses. Not sure what's up with this triggering though. |
| | Stop run |
| 1059 | Start data series of contact-free/readout=-30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold |
| 1105 | Check on BatViewer, triggering well now on positive pulses as expected given this bias. |
| 1107 | Fill LN2 cold trap full. |
| 1129 | Stop run |
| 1131 | Flash for 30s with DIB4 LEDs. |
| 1146 | Start data series of contact-free/readout=+30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold |
| 1213 | Stop run |
| 1214 | Flash for 30s with DIB4 LEDs. |
| 1225 | Start LHe transfer (MB = 13.9%) |
| 1336 | Finish LHe transfer (MB = 92.8%) |
| 1403 | Start data series of contact-free/readout=+30V/0V data with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold |
| 1415 | Check on BatViewer, triggering well on negative pulses as expected given this bias. |
| 1451 | Check on BatViewer, pulses are both positive and negative and trigger rate has fallen. |
| 1453 | Stop run, flash for 30s with DIB4 LEDs. |
| 1510 | Play around with using the 1kV kepco supply to bias. Earlier I had been using GND/+ which introduced 60Hz noise. If we use -/+ (or use GND/+ with - shorted to GND) the 60Hz noise goes away and the noise overall looks similar to that with the Instek 30V supply. |
| 1516 | Start data series of contact-free/readout=+50V/0V data (w/1kV supply) with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold |
| 1521 | Check on BatViewer, triggering well on negative pulses as expected given this bias. |
| 1608 | Stop run |
| 1609 | Measure V_leak = 0.00 mV at V_applied = 50 V |
| 1611 | Flash for 30s with DIB4 LEDs. |
| 1638 | Start data series of contact-free/readout=+30V/0V data (w/1kV supply) with DIB1/3/4 = DCRC 1/none/2 = master/none/slave, 1000 beginning randoms, and a 50ADC bin threshold |
| 1800 | Stop data. Went a lot longer than it needed to. The first 21 minutes looks good according to file sizes. |
| 1800 | Dial HV down to 0V then short electrode leads. |
| 1800 | Flash for 30s with DIB4 LEDs. |