| | Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/3/2 → gender changers → rerouting boards 1/3/4 → -/DCRC55(1)/- |
| | Overnight UV baked for 5 hours. Ended at 4:07 am, and took 26 minutes to cool from 700 mK to 200 mK. |
| 0909 | Tower/MC/Coldplate = 73.9/54.3/307 mK, Still = 1.16 K / 0.19 mbar, G1/G2 = 266/259 mbar, 1K Pot = 1.60 K / 19 mbar. MB = 26.9% |
| 0912 | Fill LN2 cold trap full. |
| 0913 | Tweak 1K pot needle valve. |
| 0940 | 1K Pot = 1.65 K / 38 mbar |
| 0941 | Tried yesterday to take QE only data to see low 241Am lines, but threshold was too high. Let's try again with only a single DCRC operating to lower the noise and use a lower threshold. |
| | Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/3/2 → gender changers → rerouting boards 1/3/4 → -/-/DCRC50(3) |
| 0945 | Start series of data with Vbias(external) = 90.1 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC3qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 0949 | Stop run Something is wrong with the dumps, BatViewer crashes when trying to open them… Not sure what's wrong here, let's just go back to the normal setup but only trigger on QE still. |
| 0950 | Setup: DIB 1/3/4 → 3.2 MHz filters 1/2/3 → cable 1/3/2 → gender changers → rerouting boards 1/3/4 → DCRC55(1)/33(2)/50(3) |
| 0951 | Start series of data with Vbias(external) = 90.0 V, with 1000 beginning randoms, and a 20 ADC bin threshold trigger on DCRC3qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 0956 | Triggering in noise. Raise DCRC3QO threshold from 20 → 30 ADC during 5th minute. |
| 1001 | Still triggering on noise. Disable 15V power on DCRCs 1,2 during 10th minute. |
| 1004 | Triggering in noise. Raise DCRC3QO threshold from 30 → 40 ADC during 13th minute. |
| 1004 | Now triggering on pulses. Reduce DCRC3QO threshold from 40 → 35 ADC during 16th minute. |
| 1011 | Still triggering on pulses. Reduce DCRC3QO threshold from 35 → 33 ADC during 20th minute. |
| 1014 | Around 5:1 noise:pulses. Raise DCRC3QO threshold from 33 → 34 ADC at beginning of 25th minute. |
| 1019 | Around 2:1 noise:pulses. Leave it like this for whatever neutralized time is remaining. |
| 1105 | Stop run. Ground detector. Dump sizes have fallen. |
| 1120 | Now we are back in the standard DCRC configuration. We saw last night that the UV LEDs work with DCRC1, but they just need higher currents than standard. Perhaps I wasn't being aggressive enough when trying to power them with DCRC2. |
| 1121 | Power DIB3 UV LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-4/-4. Tower temp rises to ~425 mK |
| 1125 | Power DIB3 UV LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-6/-6. Tower temp rises to ~620 mK |
| 1130 | Power DIB3 UV LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-7/-7. Tower temp rises to ~750 mK |
| 1138 | Power DIB3 UV LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-6.6/-6.6. Tower settles at ~770 mK |
| 1144 | May have overshot. Power DIB3 UV LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/-6/-6. Tower settles at ~750 mK |
| 1153 | Start LHe transfer (MB = 21.8%) |
| 1223 | Tower stays at ~750 mK. Turn off LEDs. Takes ~39 min to cool to 200mK |
| 1246 | End LHe transfer (MB = 93.4%) |
| 1415 | Tower settling at 100mK. Maybe DCRC 1,2 FETs are frozen still. Turn on DCRC 1,2 FET heaters for a few seconds, then turn them off. Tower starts to cool further. |
| 1425 | Tower settles at 82.4 mK |
| 1428 | Start series of data with Vbias(external) = 15.00 V, with 1000 beginning randoms, and a 40/30/15/40/40 ADC bin threshold trigger on DCRC1qI/qO/DCRC2qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1500 | Stop run, ground detector |
| 1506 | Turn on electrode IR LED switches on DIB3 switchboard. Try to power DIB3 IR LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 100/5000/*/*. No tower heating for currents up to 10mA (max). With both UV, IR switches enabled can still power UV LEDs with negative bias current, but IR does not respond to positive currents. |
| 1521 | Try to power DIB3 IR LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 500/5000/5/5. No heating. |
| 1522 | Try to power DIB3 IR LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 1000/5000/5/5. No heating. |
| 1523 | Try to power DIB3 IR LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 500/1000/5/5. No heating. |
| 1524 | Try to power DIB3 IR LEDs using DCRC2 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 500/10000/5/5. No heating. |
| 1525 | Fine, DCRC2 for some reason does not want to work with these LEDs. We can run them with DCRC1, but we'll have to switch which DIBs from the standard we've been using for the bias scan studies. |
| 1525 | Stop programs, power down DCRCs. 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) |
| | The bias values I found last night for this DCRC were IR/UV=2/-4 mA. I'll leave both sets connected and just use the polarity to address one or the other. |
| 1527 | Try to power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 500/10000/-4/-4. Heating. |
| 1528 | Try to power DIB3 UV LEDs using DCRC1 with LED settings: LEDPulseWidth/LEDRepRate/LED1Current/LED2Current = 500/10000/2/2. Heating. |
| 1534 | Use simple test.msl sequence to flash using IR LEDs (+2mA) for 60s. Tower reaches ~530 mK |
| 1705 | Tower = 83.8 mK. Maybe 60s is too long to be practical for these LEDs since it takes much longer to cool back to base. |
| 1707 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 30/15/15/40/40 ADC bin threshold trigger on DCRC1qO/DCRC2qI/qO/DCRC3qI/qO, with trigger baseline = 32 samples and trigger length = 10 samples (these are 2x the usual values). |
| 1721 | Triggering in noise. Increase DCRC1,2 trigger thresholds by 5 ADC in 16th minute so we now have 35/20/20/40/40 ADC bin threshold trigger on DCRC1qO/DCRC2qI/qO/DCRC3qI/qO |
| 1727 | Still triggering on noise, but we've probably lost neutralization by now. Stop the run, ground the detector. |
| 1729 | Fill LN2 cold trap. |