| | 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) |
| 1005 | Tower/MC/Coldplate = 82.5/57.5/372 mK, Still = 6 mW / 1.23 K / 0.20 mbar, G1/G2 = 302/289 mbar, 1K Pot = 1.652 K / 38 mbar. MB = 61.4% |
| 1010 | Fill LN2 cold trap bath. |
| 1012 | Let's look for flashing having any effect. We'll de-neutralize, then try flashing/not flashing and starting a run after 5 minutes. |
| 1014 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 55/20/20/45/45 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). |
| 1035 | Stop run and ground detector after 20 mins. Dumps fell in size around minute 6, then levelled out from minutes 13-20 |
| | Wait 5 min |
| 1040 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 55/20/20/45/45 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). |
| 1050 | Strange, dumps are staying as large as they were at the beginning of the previous series. (Later: looks like we're triggering on noise here) |
| 1100 | Stop run and ground detector. |
| | Wait 5 min |
| 1104 | Restart midas programs (triggerfe, towerfe, dcrcdriver) to try and fix the triggering |
| 1106 | Start series of data with Vbias(external) = 10.00 V, with 1000 beginning randoms, and a 55/20/20/45/45 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). |
| 1131 | Stop data, and ground detector. Dumps fell in size around minute 4, then levelled out from minutes 7-24. |
| 1138 | Do a 1 second flash using flashandflash tool. Tower peaks at 220 mK. Wait till Tower less than 90 mK, not long. |
| 1141 | Apply 10.01 V bias to electrode |
| 1141 | Start series of data with Vbias(external) = 10.01 V, with 1000 beginning randoms, and a 55/20/20/45/45 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). |
| | This is not a perfect comparison because it's been about 10 minutes since we grounded. Maybe we can try this 1 more time after deneutralizing, immediately flashing then waiting close to 5 minutes. |
| 1153 | Once again it looks like we are overtriggering. By the 9th dump, dump sizes have not decreased, and BatViewer suggests that it's triggering constantly. I think we should go back to triggering only on one DCRC2 channel. |
| 1155 | Disable triggering on all except DCRC2qO. Its threshold is 20 ADC. |
| 1205 | Stop run and ground detector. Flash with DIB LEDs (DCRC1&3) for 1 second. Tower peaks at 225 mK. Falls below 100 mK before starting data. |
| 1210 | Start series of data with Vbias(external) = 10.03 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). |
| 1233 | Stop run and ground detector. Dumps fell in size starting with Dump 7 and reached a minimum at Dump 12. |
| 1233 | Flash for 1 second with DIB LEDs (DCRC1&3) but this time with LEDPulseWidth reduced from 100 us to 10 us. (can't use flashandflash tool to do this - instead use simple sequence script.) Tower peaks at 123 mK. |
| 1238 | 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). |
| 1304 | Stop run and ground detector. Dumps fell in size starting with Dump 7 and reached a minimum at Dump 12. Same as with the full LEDPulseWidth. |
| | We'll try once more with no flashing at all, just a 5 minute wait. Verify that that the hold time is reduced. |
| 1309 | 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). |
| 1335 | Stop run and ground detector. Dumps fell in size starting with Dump 3 (if not earlier) and reached a minimum at Dump 8. So definitely hold time is not as good with a no-flash 5-minute wait. |
| 1335 | Flash for 1 second with DIB LEDs (DCRC1&3) with LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced from 5000 us to 25000 us. Tower peaks at 90 mK. |
| 1341 | 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). |
| | started 1 minute later than I intended. |
| 1406 | Stop run and ground detector. Dumps fell in size starting with Dump 7 and reached a minimum at Dump 12. So even this minimal flashing seems just as good. (At 25000 us rate, should be 40 pulses total at 1 second, although from yesterday's observations it may be more like 80 pulses, probably do to lag time in the sequencer.) |
| 1406 | Flash for 1 second with DIB LEDs (DCRC1&3) with LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 100,000 us. Tower peaks at 84.4 mK. |
| 1415 | 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). |
| | dammit, this time started 4 minutes later than I intended. |
| 1436 | Stop run and ground detector. Dumps fell in size starting with Dump 7 and reached a minimum at Dump 12. (At 100,000 us rate, should be 10 pulses total at 1 second, or 20 pulses allowing for 1 second lag.) |
| 1436 | Flash for 1 second with DIB LEDs (DCRC1&3) with LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 500,000 us. Tower peaks from 81.85 baseline to 82.15 mK (there's a baseline fluctuation of about 0.1 mK, so it's still detectable). |
| 1441 | 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). |
| 1503 | Stop run and ground detector. Dumps fell in size starting with Dump 6 and reached a minimum at Dump 12. (At 500,000 us rate, should be 2 pulses total at 1 second, or 4 pulses allowing for 1 second lag.) This may be slightly worse than a full flash. |
| 1504 | Flash for 1 second with DIB LEDs (DCRC1&3) with LEDPulseWidth reduced from 100 us to 10 us, and also with LEDRepRate reduced to 1,000,000 us. Looks like the Tower peaked at 82.1 mK from 81.8 mK baseline. |
| 1508 | 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). |
| 1535 | Dumps fell in size starting with Dump 5 and reached a minimum at Dump 11. (At 1,000,000 us rate, should be only 1 or 2 LED pulses.) Looks like this is a bit worse again than a full flash, still better than no flash. |
| 1542 | Switch to electrode LED mode by setting DIB3 switchboard appropriately. |
| 1550 | One of the Windows machine displays was acting up. Switch it out with a spare. |
| 1508 | Stop run. |
| 1559 | 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 1,000,000 us. Tower baseline has risen slightly from 81.8 to 81.9 mK starting around the time the LED switches were changed on the DIB3 switchboard. The flash produces no noticeable increase above this. |
| 1605 | 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). |
| 1630 | Dumps fell in size starting with Dump 5 and reached a minimum at Dump 12. (At 1,000,000 us rate, should be only 1 or 2 LED pulses.) Looks like this is a bit worse again than a full flash, still better than no flash. |
| 1633 | Stop run, ground detector, and flash for 1 second with electrode IR LEDs as above (15:59) except LEDRepRate now 10x higher, 100,000 us. Noticeable spike in tower temperature from 81.8 to 82.4 mK. Temperature falls to baseline quickly, so we aren't seeing the slower temperature settling that we saw before with the electrode LEDs (with much more flashing). |
| 1638 | 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). |
| 1655 | Dumps fell in size starting with Dump 6 and reached a minimum at Dump 12. (At 100,000 us rate, IR electrode LEDs.) Looks slightly worse than using the DIB LEDs with the same number of pulses. |
| 1656 | Stop data and ground electrode |
| 1700 | Fill LN2 cold trap bath |