Development of HPD Clusters for MAGIC-II

Authors :: Orito, R.
Bernardini, E.
Bose, D.
Dettlaff, A.
Fink, D.
Fonseca, V.
Hayashida, M.
Hose, J.
Lorenz, E.
Mannheim, K.
Mirzoyan, R.
Reimann, O.
Saito, T. Y.
Schweizer, T.
Shayduk, M.
Teshima, M.
Publication Year :: 2009
Abstract: MAGIC-II is the second imaging atmospheric Cherenkov telescope of the MAGIC observatory, which has recently been inaugurated on Canary island of La Palma. We are currently developing a new camera based on clusters of hybrid photon detectors (HPD) for the upgrade of MAGIC-II. The photon detectors feature a GaAsP photocathode and an avalanche diode as electron bombarded anodes with internal gain, and were supplied by Hamamatsu Photonics K.K. (R9792U-40). The HPD camera with high quantum efficiency will increase the MAGIC-II sensitivity and lower the energy threshold. The basic performance of the HPDs has been measured and a prototype of an HPD cluster has been developed to be mounted on MAGIC-II. Here we report on the status of the HPD cluster and the project of eventually using HPD clusters in the central area of the MAGIC-II camera.<br />Comment: Contribution to the 31st ICRC, Lodz, Poland, July 2009