2019/08/05 (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 → DCRCX(4)/DCRC55(1) DCRC33(2) → 1kV power supply → HV input NaI B → DCRC50(3) pB Lead/poly shield erected, south wall partial lead only (with NaI detectors). |
|---|---|
| PuBe source in lab behind lead stack. | |
| 0850 | Tower/MC/Coldplate = 39.2/30.4/198 mK, Still = 1.28 K/ 0.095 mbar / 0 mW, G1/G2= 117/117 mbar, 1K Pot = 1.66 K / 32 mbar. MB= 33.7% |
| 0856 | Tried to Fill LN2 Cold trap but LN2 container is empty. Probably Need a refill ASAP. |
| 1114 | Start a sequence of 8 @ 34 min series at HV = 180→327V, rate 4.31V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pD threshold = 6, baseline/sample length = 120/28 (standard 16/5), phonon pre-pulse 500 (standard is 500). NaI detector: 800 V → NaI B (dynode terminated) → PS776 → Lecroy 628 Fan In/Out → Ortec 452(Neg input, G=100, shaping=6us, -10V output) → DCRC3 PB, Driver Gains = 1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 512 (512 samples) Use sequence HVdrift_8X180V_4p31VPM_loopversion_prebias_10_2_dur_34min_flashDCRC_1_4.msl |
| First series has relatively high leakage (Vtest max = 15 mV), next couple are lower (Vtest max = 11 mV) | |
| 1116 | Fill LN2 cold trap full. |
| 1435 | Commence LHe transfer. MB=23.9% Data is still running, the series 07190805_1422 will be messed up. |
| 1519 | Cease LHe transfer. MB=93.3% |
| 1617 | Fill LN2 cold trap full. |
 | cuts: no randoms baseline level and std OF/INT agreement low-energy rate high pF (tight) calibration: linear based on 1.3 keV line this fiducial cut is pretty extreme, about 3% efficient on 1.3keV line |
 | second version with 10% efficient fiducial cut note noise wall is shifted |
 | First third versus last third of the data Rate of activation line should have fallen by about 30% Also shown are simulated 160eV lines, based on number of 10keV events passing all cuts Resolution of 160eV set to 30eV, estimated from background data spectra |