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So far the current ground-based Imaging Atmospheric Cherenkov Telescopes(IACTs) have energy thresholds in the best case in the range of ~30 to 50 GeV(H.E.S.S. II and MAGIC telescopes). Lowest energy gamma-ray showers produce lowlight intensity images and cannot be efficiently separated from dominatingimages from hadronic background. A cost effective way of improving thetelescope performance at lower energies is to use novel photosensors withsuperior photon detection efficiency (PDE). Currently the best commerciallyavailable superbialkali photomultipliers (PMTs) have a PDE of about 30-33%,whereas the silicon photomultipliers (SiPMs, also known as MPPC, GAPD) fromsome manufacturers show a photon detection efficiency of about 40-45%. Usingthese devices can lower the energy threshold of the instrument and may improvethe background rejection due to intrinsic properties of SiPMs such as a superbsingle photoelectron resolution. Compared to PMTs, SiPMs are more compact, fastin response, operate at low voltage, and are insensitive to magnetic fields.SiPMs can be operated at high background illumination, which would allow tooperate the IACT also during partial moonlight, dusk and dawn, hence increasingthe instrument duty cycle. We are testing the SiPMs for Cherenkov telescopessuch as MAGIC and CTA. Here we present an overview of our setup and firstmeasurements, which we perform in two independent laboratories, in Munich,Germany and in Barcelona, Spain.

Towards SiPM camera for current and future generations of Cherenkov telescopes