2018/10/05 (Friday)
| 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) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | Na22 -125V data overnight, tower = 29.6 mK |
| 0910 | Tower/MC/Coldplate = 29.6/30.3/187 mK, Still = 0.0 mW / 1.3±0.1 K / 0.085 mbar, G1/G2 = 116/111 mbar, 1K Pot = 1.59 K / 17 mbar, Turbo on IVC = 0.74 nbar, MB = 71.0% |
| 0912 | Fill LN2 cold trap bath. |
| Tuesday's IbIs worked for all channels except DCRC3pD. We'll redo that. (Note that we don't have the PuBe now. Will do it with the Na22 present.) | |
| 1305 | Prep for DCRC3pD IbIs. Turn off triggering. Reset DCRC3pD Driver Gain from 2 to 1. Then take QET biases to where IbIs is max (see May 31) and adjust driver offset to near top of range. Readjust QET bias to standard transition value. |
| 1310 | Notice that in-run randoms rate is set to 20 Hz probably since Tuesday's IbIs. So the last few days of data are polluted with randoms. |
| 1315 | Dial HV up to -125V with 15%/5min prebias using change_HV_0_to_125_15-5PreBias_DCRC2_250V.msl |
| 1339 | Start IbIs sequence on DCRC3pD, from 450 to 200 step -2 uA, HV = -125 V, front-end gain 10, driver gain 1. PuBe source present. Using IbIs_loop_DCRC3pD.msl |
to return to normal after IbIs:
- set all phonon driver gains x2
- adjust driver offsets to get baselines to the usual low-ish spot
- turn triggering back on on DCRC3 phonon channels
- check randoms settings in triggerfe2
| 1435 | Dial HV from -125V to 0V using change_HV_125_to_0_DCRC2_250V.msl |
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| 1450 | Flash DCRCs 1,3 for 30 seconds |
| 1527 | Start 8x2hr 22Na series at HV = -125 V with 15% prebias for 5 min, split into 10 min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-125×8-15_5PreBias-DCRC2_250V-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/280/305)/(140/280/295) uA, Front-End Gains = (10/10/10)/(10/15/10) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/C/D threshold = 7/10/9 |
| 1552 | Fill LN2 cold trap full. |
| 1635 | Looks like Filename in ODB was set wrong, IbIs script should have reset it: ODBSET “/Logger/Channels/0/Settings/Filename” .RUN%05d_DUMP%04d.mid.gz Reset it manually just now, hopefully data will now continue correctly. Currently on 6th series, presumably 7th series and onward will be ok |