Author/Authors :
Hayashida، نويسنده , , Petar M. and Ninkovic، نويسنده , , J. and Hose، نويسنده , , J. and Hsu، نويسنده , , C.C. and Mirzoyan، نويسنده , , R. and Teshima، نويسنده , , M.، نويسنده ,
Abstract :
A new type of Hybrid PhotoDetectors (HPDs) with an 18-mm-diameter GaAsP photocathode was developed in order to lower the energy threshold of the MAGIC-II Project. The Quantum Efficiency (QE) reaches more than 50% at around 500 nm and is enhanced in the UV region by the wavelength shifting technique. The total light conversion efficiency could be practically improved by about a factor 2 compared to the conventional PhotoMultiplier Tubes (PMT). Photocathode ageing measurements indicate that GaAsP photocathode have a sufficiently long lifetime for being used in the MAGIC telescope imaging camera.
Keywords :
Imaging atmospheric Cherenkov telescope , Hybrid photodetector , GaAsP photocathode , High quantum efficiency
