2017/11/02 (Thursday)
| Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/3/2 → gender changers → rerouting boards 1/3/4 → DCRC33(2)/DCRC55(1)/DCRC50(3) | |
| 1011 | Tower/MC/Coldplate = 82.5/57.7/365 mK, Still = 6 mW / 1.24 K / 0.20 mbar, G1/G2 = 299/283 mbar, 1K Pot = 1.649 K / 38 mbar. MB = 22.3% |
| 1016 | Fill LN2 cold trap bath. |
| 1017 | Start series of data with Vbias(external) = 10.00 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1035 | Dump sizes start to fall around dump 7 and reach a minimum at dump 15. |
| 1040 | Stop run, ground detector and flash for 1 second with electrode IR LEDs (DCRC1) with with 2 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 25,000 us. Tower temp rises from 82.2 mK to 84.1 mK, falls back to baseline within 3 min. |
| 1045 | Start series of data with Vbias(external) = 10.00 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1105 | Dump sizes start to fall around dump 7 and reach a minimum at dump 15. |
| 1111 | Stop run, ground detector and flash for 1 second with electrode IR LEDs (DCRC1) with with 2 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 5,000 us. Tower temp rises from 825.4 to 93.8 mK and returns to base in 10 min. |
| 1116 | Start series of data with Vbias(external) = 10.00 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1130 | Dump sizes start to fall around dump 7 and reach a minimum by dump 12. |
| 1158 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 1,000,000 us. Tower temp does not change from 82.7 mK |
| 1203 | Start series of data with Vbias(external) = 10.00 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1230 | Dump sizes start falling at Dump 4 and reach a minimum by Dump 10. |
| 1241 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 500,000 us. Small tower temp spike from 82.6 to 83.0 mK and back. |
| 1246 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1330 | Dump sizes start falling at Dump 4 and reach a minimum by Dump 10. |
| 1337 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 100,000 us. Small tower temp spike from 83.0 to 84.5 mK and back. |
| 1342 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1400 | Dump sizes start falling at Dump 3 and reach a minimum by Dump 10. |
| 1414 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 25,000 us. Small tower temp spike from 82.9 to 87.4 mK. |
| 1418 | Tower at 83.2 mK and cooling. |
| 1419 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1445 | Dump sizes start falling at Dump 4 and reach a minimum by Dump 10. |
| 1451 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 5,000 us. Tower spikes from 82.9 to 103 mK. |
| 1455 | Tower at 90 mK and cooling. |
| 1456 | Start series of data with Vbias(external) = 10.02 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1515 | Dump sizes start falling at Dump 4 and reach a minimum by Dump 9. |
| 1517 | Stop run, ground detector and flash for 1 second with electrode UV LEDs (DCRC1) with with -4 mA LEDcurrent, LEDPulseWidth at standard 100 us, and with LEDRepRate at standard 5,000 us. Tower spikes from 83.5 to 117 mK. (Base temperature seemed to be still elevated since the last flash.) |
| 1521 | Tower at 95 mK and cooling. |
| 1522 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1515 | Dump sizes start falling at Dump 4 and reach a minimum by Dump 9. |
| we'll try a known good flashing again just to doublecheck | |
| 1554 | Stop run, ground detector and flash for 1 second with electrode IR LEDs (DCRC1) with with 2 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 25,000 us. Tower temp spikes from 83.0 mK to 87.5 mK. OOPS - no, I only set LED1 to 2 mA, LED2 was at -4 mA. So this was a “hybrid”, flashing with one IR and one UV LED. That's probably why the temperature went higher than last time I tried this configuration, I think the UV heats the tower more. |
| 1558 | Tower at 84.2 mK and cooling. |
| 1559 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC2qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1620 | Dump sizes start falling at Dump 7 and reach a minimum by Dump 13. |
| 1622 | Stop run and ground electrode. |
| 1625 | Set up to take another data series while observing the LED pulses. On DCRC1, LEDpulseWidth 10 us, LEDrepRate 100,000 us, connect LED outputs to phonon channels. Turn off randoms, turn off DCRC2 qO triggering, turn on DCRC1 pA & pB triggering. Increase phonon trace to 512 samples. |
| 1630 | Start series of data with Vbias(external) = 0 V, with no beginning randoms, and a 100 ADC bin threshold trigger on DCRC1pA,pB, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1630 | Flash for 1 second with electrode IR LEDs (DCRC1) with with 2 mA LEDcurrent, LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 100,000 us. |
| 1631 | Stop data. |
| 1635 | Looking at data with BatViewer, looks like 19 LED pulses. 19*100,000 us = 1.9 seconds. So yes it looks like there's about a 1 second lag in the sequencer. |
| 1635 | Close V6 to stop circulation and allow mix to expand into still line |
| 1635 | Turn off still heater |
| 1640 | Fill LN2 cold trap bath (will pump out trap tomorrow) |
| 1640 | Tower temperature increasing, Still pressure increasing, Condenser pressure falling |
| 1640 | IVC = 30 nbar. We have not been pumping on it. A little higher than last run |
| 1645 | Tower = 280 mK, Still = 5.5 mbar, Condenser = 185 mbar. |
| 1645 | Close 1K Pot speedivalve to stop pumping on pot. Leaving needle valve open. Close V4a and valve to 4He pump. Open 4He outlet to “exhaust” and close recovery valve. Turn off 4He pump. |
| 1650 | Turn off 3He pump. Since v6 and v9 are closed, pump is isolated. |
| 1650 | Tower = 506 mK, Still = 140 mbar, Condenser = 118 mbar. 1K Pot = 2.32 K / 0.018 mbar. |
| 1655 | Open V4 to let condenser expand into dump. Condenser falls to 20 mbar. |
| 1700 | Open V3 to let still side expand into dump. Condenser falls slightly. |
| 1700 | Main bath = 11.4% |
| 1700 | Tower = 617 mK. Leaving the tower thermometer on with range reduced to 6.32 kΩ and excitation 20 uV |
| 1710 | Tower = 667 mK, Fridge = 22 mbar. 1K Pot = 3.12 K |
| Date | Time of flash | LEDs used | Flash time [s] | Time between flashes [us] | Pulse width [us] | Max tower temp [mK] | Wait time [min] | Dump at which sizes start falling | Dump at which minimum reached |
|---|---|---|---|---|---|---|---|---|---|
| Oct-31 | 11:24 | DIB IR | 60 | 5000 | 100 | 700 | 8 | 13 | |
| Oct-31 | 12:20 | DIB IR | 6 | 5000 | 100 | 360 | 7 | 13 | |
| Oct-31 | 12:54 | DIB IR | 2 | 5000 | 100 | 255 | 7 | 13 | |
| Oct-31 | 14:56 | DIB IR | 2 | 5000 | 100 | 240 | 7 | 12 | |
| Oct-31 | 16:11 | DIB IR | 2 | 5000 | 10 | 135 | 7 | 12 | |
| Oct-31 | 16:55 | none | 6 | 4 | 9 | ||||
| Nov-1 | 09:05 | none | o/n | 7 | 13 | ||||
| Nov-1 | 09:41 | none | 25 | 7 | 13 | ||||
| Nov-1 | 11:00 | none | 5 | 4 | 7 | ||||
| Nov-1 | 12:05 | DIB IR | 2 | 5000 | 100 | 225 | 7 | 12 | |
| Nov-1 | 12:33 | DIB IR | 2 | 5000 | 10 | 123 | 7 | 12 | |
| Nov-1 | 13:04 | none | 5 | 3 | 8 | ||||
| Nov-1 | 13:35 | DIB IR | 2 | 25000 | 10 | 90 | 7 | 12 | |
| Nov-1 | 14:06 | DIB IR | 2 | 100000 | 10 | 84.4 | 7 | 12 | |
| Nov-1 | 14:36 | DIB IR | 2 | 500000 | 10 | 81.85 | 6 | 12 | |
| Nov-1 | 15:04 | DIB IR | 2 | 1000000 | 10 | 82.1 | 5 | 11 | |
| Nov-1 | 15:59 | electrode IR | 2 | 1000000 | 10 | 5 | 12 | ||
| Nov-1 | 16:33 | electrode IR | 2 | 100000 | 10 | 82.4 | 6 | 12 | |
| Nov-2 | 10:40 | electrode IR | 2 | 25000 | 10 | 84.1 | 7 | 15 | |
| Nov-2 | 11:11 | electrode IR | 2 | 5000 | 10 | 93.8 | 7 | 12 | |
| Nov-2 | 12:41 | electrode UV | 2 | 500000 | 10 | 83 | 4 | 10 | |
| Nov-2 | 13:37 | electrode UV | 2 | 100000 | 10 | 84.5 | 3 | 10 | |
| Nov-2 | 14:14 | electrode UV | 2 | 25000 | 10 | 87.4 | 4 | 10 | |
| Nov-2 | 14:51 | electrode UV | 2 | 5000 | 10 | 103 | 4 | 9 | |
| Nov-2 | 15:17 | electrode UV | 2 | 5000 | 100 | 117 | 4 | 9 | |
| Nov-2 | 15:54 | electrode IR/UV | 2 | 25000 | 10 | 87.5 | 7 | 13 |
