2017/11/29 (Wednesday)
| Setup: DIB1/3/4 → SL 27/19/20 → 3.2 MHz filters → cables 2,1,3 → HV board inputs 1,3,2 → HV board outputs 1,2 → DCRC55(1)/50(3). Also DCRC4 is powered and hooked up to control the HV setting. | |
| 0850 | Reboot the Windows machine vuk-01, which crashed last night. |
| 0900 | Fill LN2 cold trap bath |
| 0920 | Tower/MC/Coldplate = 22.4/24.8/155 mK, Still = 1.3 K / 0.100 mbar, G1/G2 = 236/209 mbar, 1K Pot = 1.64 K / 30 mbar, MB = 68.7% |
| 0925 | Stop DAQ programs, restart MIDAS, start DAQ programs |
| 0940 | Adjust driver offsets to get all six phonon baselines near 0.8 V |
| 0945 | Prebias for 5 min: Turn on power supply with DCRC4QObias = 2V. HV/DCRC4Qi = 0.1/10.76 V. Slowly ramp up to 52 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 52.52/5.2 V |
| 0955 | Slowly ramp down to 45 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 45.03/5.99 V |
| 0957 | Begin IbIs data sequence on DCRC3pC with HV=45V from 600 to 300 uA in 1.0 uA steps, 3 seconds of data per step. (IbIsDCRC3pC.msl) |
| Sequence continued to completion. Data looks good. | |
| 1015 | HV = 44.97 V, V_leak = 2.00 mV |
| 1050 | HV = 44.98 V, V_leak = 1.78 mV |
| 1110 | HV = 44.98 V, V_leak = 1.77 mV |
| 1115 | Slowly ramp bias down to 0V (HV/DCRC4Qi = 0.01/10.765 V) and turn off power supply (set DCRC4QObias=0). |
| 1115 | Flash for 30s using flashandflash GUI. |
| 1150 | Stop DAQ programs, restart MIDAS, start DAQ programs |
| 1150 | Prebias for 5 min: Turn on power supply with DCRC4QObias = 2V. HV/DCRC4Qi = 0.1/10.76 V. Slowly ramp up to 52 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 52.48/5.2 V |
| 1155 | Tower = 23.2 mK, looks flat |
| 1155 | Adjust driver offsets (some relocking) to get baselines around 0.8 V |
| 1200 | Slowly ramp down to 45 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 45.00/5.99 V |
| 1201 | Begin IbIs data sequence on DCRC3pB with HV=45V from 750 to 300 uA in 1.0 uA steps, 3 seconds of data per step. (IbIsDCRC3pB.msl) |
| Sequence continued to completion. Data is OK but there were several SQUID lockpoint jumps. | |
| 1305 | HV = 44.94 V, V_leak = 1.69 mV |
| 1355 | HV = 44.96 V, V_leak = 1.64 mV |
| 1355 | The Windows machine vuk-01 seems to have crashed again. Attempt to powercycle and reboot. In attempting to reboot, seems to be in an infinite loop, Windows never starts. messed around with startup options, unplugged one of the monitors, got it to boot. |
| 1410 | Slowly ramp bias down to 0V (HV/DCRC4Qi = 0.01/10.76 V) and turn off power supply (set DCRC4QObias=0). |
| 1415 | Flash for 30s using flashandflash GUI. |
| 1420 | Stop DAQ programs, restart MIDAS, start DAQ programs |
| 1450 | Tower = 23.2 mK, still falling slowly. Was 22.3 mK before flash. |
| 1450 | Prebias for 5 min: Turn on power supply with DCRC4QObias = 2V. HV/DCRC4Qi = 0.1/10.76 V. Slowly ramp up to 52 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 52.48/5.2 V |
| 1455 | Tower = 22.6 mK |
| 1455 | Adjust driver offsets to get baselines around 0.8 V |
| 1500 | Slowly ramp down to 45 V at 1V/sec by changing DCRC4/Charge/Bias (V)[0] by 0.1 V/sec by hand in the ODB. HV/DCRC4QI = 44.98/5.99 V |
| 1504 | Begin IbIs data sequence on DCRC3pD with HV=45V from 750 to 450 uA in 1.0 uA steps, 3 seconds of data per step. (IbIsDCRC3pD.msl) |
| Sequence continued to completion. Data looks good. 700 to 400 uA might be better though. | |
| 1525 | The Windows machine vuk-01 crashed yet again. Maybe it's happening when the screen saver comes on. Powercycle and reboot. Got stuck in the reboot loop again, went into settings and looked around, eventually it booted. On ControlPanel/Display/ScreenSaver/Power, set Turn Off Monitor to Never. |
| 1555 | Tower = 22.4 mK |
| 1605 | HV = 44.99 V, V_leak = 1.63 mV |
| 1610 | Slowly ramp bias down to 0V (HV/DCRC4Qi = 0.005/10.765 V) and turn off power supply (set DCRC4QObias=0). |
| note: misdialed 89 instead of 8.9 in the voltage input during ramp down, corrected it right away. Caused a temperature spike of a few mK. | |
| 1615 | Flash for 30s using flashandflash GUI. |
| 1620 | Fill LN2 cold trap full. |
| 1704 | vuk-01 has crashed again and is stuck in a boot-fail cycle. Holding the power button doesn't stop the cycle, it just tries to boot again. Pull the plug for now… |