2018/07/09 (Monday)
| 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) | |
| 0910 | Tower/MC/Coldplate = 30.1/29.3/180 mK, Still = 1.4 K / 0.150 mbar / 2 mW, G1/G2 = 170/159 mbar, 1K Pot = 1.66 K / 38 mbar. MB = 47.6% |
| 0915 | Fill LN2 cold trap bath. |
| 0945 | Still unable to get DAQ programs to run if DCRC4 is enabled Turn off DAQ programs and power cycle DCRC4. Then turn on DAQ programs with DCRC4 enabled. Looks like it worked. |
| 1006 | Set HV=40V using sequence changeHV_0_40.msl |
| 1358 | Start LHe transfer @ MB = 40.8% |
| 1447 | End LHe transfer @ MB = 91.3% |
| During transfer G1/G2 went up, G1 170→200 mbar. Tower temperature went down about 2 mK then wiggled then spiked to 32 then settled at 29.8 mK, less than the 31.3 mK before transfer. | |
| 1500 | Erect South shield wall with NaI detectors mounted. No Pb added yet. |
| 1515 | Adjust driver offsets on all 6 channels in preparation for IbIs |
| 1515 | HV = 39.77 V, Vtest = 13.7 mV, Vdetector = 34.3 V. Vtest was 33 mV earlier, before we turned on the purge. |
| 1520 | Increase N2 purge to Ebox a little bit. HV leakage is falling. |
| 1535 | HV = 39.77 V, Vtest = 5.35 mV, Vdetector = 37.6 V. |
| 1535 | Tower = 29.9 mK |
| somewhere here, before 16:45, PuBe neutron source removed from PAN43. Built lead castle in red box in PAN443 and moved source there. | |
| 1537 | Start IbIs sequence on DCRC1pA, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| 1605 | At end of sequence Tower temperature rose to 30.4 mK then fell again |
| 1605 | HV = 39.77 V, Vtest = 4.46 mV, Vdetector = 38.0 V. |
| 1605 | Start IbIs sequence on DCRC1pB, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| 1650 | Tower temperature and Condenser have been creeping up in steps, troubling. Tower = 31.1 mK, G1/G2 = 205/189 mbar |
| 1654 | Start IbIs sequence on DCRC1pC, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| 1700 | Fill LN2 cold trap bath |
| 1750 | HV = 39.78 V, Vtest = 4.15 mV, Vdetector = 38.1 V. |
| 1750 | Tower = 31.5 mK |
| 1753 | Start IbIs sequence on DCRC3pB, from 300 to 50 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| 1845 | Start IbIs sequence on DCRC3pC, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. This one failed toward the end because apparently the MIDAS DAQ locked up. This has happened before, seems we can only run a certain number of IbIs sequences in a row. |
| 1900 | Tower temperature rose again for some reason, now Tower = 33.3 mK |
| 2012 | Start IbIs sequence on DCRC3pC, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. Looks like all channels except DCRC3pD have railed. So this sequence needs to be repeated. |
| 2046 | Start IbIs sequence on DCRC3pD, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| 2030 | Start test series of randoms to remotely try to recover DCRC3pC relocked it, looks like that got it back |
| 2238 | Start IbIs sequence on DCRC3pC, from 450 to 200 step -2 uA, HV = 40 V, front-end gain 10, driver gain 1. |
| Tower temperature has stepped up and down several times, ranging between 30 and 33 mK. Seems to be affected by running IbIs sequences but I don't understand why. | |
| 2320 | Ok got a good set of IbIs now. Dial HV down to 0 V using sequence changeHV_40_0 |