| | 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. |
| | Windows machine vuk-01 has crashed. Currently no access to LabVIEW cryo vi's.
This morning the power button blinked orange rather than turning green. Hopefully this is just a power supply issue. Currently the computer is in the hands of Jesse in IT. He may have an extra power supply - if not we should order one. |
| 0905 | Tower = 280 kΩ (22.3 mK), Still = 0.110 mbar, G1/G2 = 242/222 mbar, 1K Pot = 1.63 K / 28 mbar, MB = 33.1% |
| | Using the tower thermometer calibration found on the wiki, Tower = 280 kΩ corresponds to 22.3 mK. Currently there is a spreadsheet open with a convenient lookup table - find the resistance in the table closest to the LakeShore reading and read off the temperature.
If we want there are also calibrations for MC, Still, Coldplate thermometers |
| 0910 | Fill LN2 cold trap bath |
| 1320 | Start LHe transfer (MB = 26.6%) |
| 1343 | Test changeHV bias ramp sequence. Turn on HV power supply using DCRC4QO=2. Start sequence changeHV_0_45_preBias15_5.msl This should ramp up, prebias by 15% for 5 min and then ramp down to 45 V . |
| 1347 | Sequence ramps voltage from 0 to 51.63 V over ~1 min. V_leak never goes above ~40 mV. Sequence waits for 5 min. |
| 1353 | Sequence ramps down to 45.01 V. Now try changeHV_45_0.msl to turn the bias back down to 0 from 45 V. Sequence ends with HV = 55 mV. Turn off HV power supply with DCRC4QO=0. HV = 0.86 V. |
| 1407 | Need higher voltage calibrations for automated bias scans. Take a few data points. |