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