| | Setup: DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2 → gender changer 3/?/2 → HVConn 1/3/2 → HV 1/2 → DCRC55(1)/DCRC50(3) |
| | overnight: DCRCs powered, 60V bias on detector |
| 0938 | Tower/MC/Coldplate = 34.7/30.6/195 mK, Still = 1.40 K / 0.100 mbar, G1/G2 = 165/155 mbar, 1K Pot = 1.52±0.01 K / 6.5±0.5 mbar. MB = 72.8% |
| 0940 | Vbias/Vtest/Vdet = 60.51/4.2/58.8 V |
| 0943 | Dial HV down to 0V and ground. |
| 0945 | Fill LN2 cold trap bath. |
| 0945 | Dial HV down to 0 V |
| 0950 | Flash detector (DCRCs 1,3) for 30 seconds |
| 1035 | Tower = 34.9 mK |
| 1300 | Realized why the Keithley Electrometer was still having issues measuring the test resistor voltage. There was a jumper on the back of the device connecting the “lo” side of the voltage to ground. Disconnect this jumper. |
| 1315 | Dial prebias HV up to 55 V. |
| 1320 | Vbias/Vtest/Vdet = 55.21/5.48/53.02 V. |
| 1330 | Dial HV down, Vbias/Vtest/Vdet = 40.04/1.21/39.56 V |
| 1332 | Start sequence of 1 60-minute background data series at HV = 40V, Driver Gains = 2x, QET biases = 290/270/315/140/315/310 uA, Front-End Gains = 10, 1000 initial randoms, trigger on DCRC3pB/C/D threshold = 10/20/20, no flash between, using sequencer script SimpleDataLoopNoFlash.msl. Tower = 34.8 mK. |
| 1440 | Vbias/Vtest/Vdet = 40.04/2.30/39.12 V |
| 1445 | Dial HV down to 0 V and short leads. |
| 1455 | Unplug variac from wall, plug into power strip connected to the power relay card for the Kepco HV supply. Plug power strip into wall with disconnected ground plug. Plug the power relay card into wall. Plug voltage cable into D50 breakout board connected to DCRC4. Power DCRC4. Turn off DAQ programs, adjust ODB for all three DCRCs, turn DAQ programs on again. |
| 1500 | Currently Kepco HV is turned all the way down. Run sequence changeHV_0_70.msl to calibrate remote HV control. |
| 1500 | Actually this didn't work, need to turn on HV first by setting DCRC4q[1] to 2 V. Then set DCRC4q[0] to 10.652, which is the “HV=0” value according to the sequence script. Try again. After sequence finishes, dial manually to 70.00 V. |
| 1505 | Test HV control by running changeHV_70_0.msl. Ends at -0.18 V. Try turning off HV - now reads 0.86 V. |
| 1550 | DCRC3 channels railed. Recover by relocking and adjusting driver offsets. |
| 1648 | Fill LN2 cold trap full. |
| 1656 | Start HV scan of 60-minute background data series at HV = 0,10,20,30,40 V, with 15% prebias for 5 min, Driver Gains = 2x, QET biases = 290/270/315/140/315/310 uA, Front-End Gains = 10, 1000 initial randoms, trigger on DCRC3pB/C/D threshold = 10/20/20, flash for 30s, cool for 30 min, using sequencer script HVscan-0_10_20_30_40V-15_5PreBias-30Flash-30wait-1hrData.msl |