AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
EDI_PSA
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Entry time:
Sun May 19 08:41:40 2024
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> Using a 1x1 Hamamatsu photodiode (uncoated) > +75V bias supplied via RAL108 and standard photodiode mount. Imon ~0 > Note negative bias would be supplied with standard lemo cable + standard mount. > Positive bias supplied via modified lemo cable to read *positive* pulses after RAL108 preamp > > ->CHANGED dynamic range to 0.5 Vpp (from 2 Vpp) > > R14 > Positive signals > 2.5 Hz Pulser > 1024 window / 600 pre-gate trigger > 70 threshold / 2300 baseline > 55098 DC offset > 208Bi source > > > DAQ stopped acquiring for unknown reasons at 22:30. > Enough data to analyse. > > Swapped Bi source for 3-alpha. Had to move diode around. > Pick-up / microphonic noise much worse now. Baseline too unstable to trigger. > Giving bias results in 1 uA / 25 V current (vs. ~0 before). > No alphas can be seen. > Further investigation needed. > > After plugging/uplugging wire from diode leakage current no longer grows to 1 uA / 25 V when giving bias. > Behaviour appears inconsistent. Heat shrink applied to makeshift connector to improve situation. Now running > without leakage current at 75 V. > > Note 208Bi source was found to be leaky and removed. > > R15 > Positive signals > 2.5 Hz Pulser > 1024 window / 650 pre-gate trigger > 70 threshold / 2300 baseline > 55098 DC offset > 3-alpha source
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