Development of HPDs with a 18-mm-diameter GaAsP - NDIP 11
Development of HPDs with a 18-mm-diameter GaAsP - NDIP 11
Development of HPDs with a 18-mm-diameter GaAsP - NDIP 11
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1.Su<strong>mm</strong>ary<br />
<strong>18</strong><strong>mm</strong> <strong>GaAsP</strong> <strong>HPDs</strong> are almost ready to be used in<br />
IACTs <strong>with</strong> low energy threshold like MAGIC-II.<br />
The QE peak value <strong>of</strong> 50 % doubles the photon<br />
collection efficiency.<br />
(corresponding increase <strong>of</strong> mirror <strong>diameter</strong>: 17m → 24m)<br />
additional improvement achieved <strong>with</strong> WLS : ~10%<br />
<strong>GaAsP</strong> photocathode is expected to have sufficiently long<br />
lifetime to survive starlight and NSB during 10 years<br />
– Only several tubes will degrade by bright starlight.<br />
23 Jun 05: Beaune M.Hayashida et al. 19
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