Recent measurements with the Pad HPD
Linearity of the signal vs high voltage
Imaging properties of the HPD .
| Pulse height spectrum taken with an HPD equipped with a CsI photocathode |  |
| Linearity of the signal vs high voltage taken withan HPD equipped with a CsI photocathode |  |
| Imaging properties of the HPD The plot shows the relation between the coordinate on the photoceathode and the coordinate on the silicon sensor. The slope of the curve determines the demagnification |  |
| Point spread function The plot shows
the charge distribution on the silicon sensor for an illumination with a point like light
source.
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| Tyupical quantum efficiency of a bialkali photocathodes in standard HPD envelopes (PC68 = envelope 1st generation, PC87 = envelope 2md generation) | 
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| Random noise versus high voltage (PC80, 2nd generation envelope) |  |
