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With the development of the Imaging Atmospheric Cherenkov Technique (IACT),Gamma-ray astronomy has become one of the most interesting and productivefields of astrophysics. Current IACT telescope arrays (MAGIC, H.E.S.S, VERITAS)use photomultiplier tubes (PMTs) to detect the optical/near-UV Cherenkovradiation emitted due to the interaction of gamma rays with the atmosphere. Forthe next generation of IACT experiments, the possibility of replacing the PMTswith Silicon photomultipliers (SiPMs) is being studied. Among the maindrawbacks of SiPMs are their limited active area (leading to an increase in thecost and complexity of the camera readout) and their sensitivity to unwantedwavelengths. Here we propose a novel method to build a relatively low-costpixel consisting of a SiPM attached to a PMMA disc doped with a wavelengthshifter. This pixel collects light over a much larger area than a singlestandard SiPM and improves sensitivity to near-UV light while simultaneouslyrejecting background. We describe the design of a detector that could also haveapplications in other fields where detection area and cost are crucial. Wepresent results of simulations and laboratory measurements of a pixel prototypeand from field tests performed with a 7-pixel cluster installed in a MAGICtelescope camera.

Light-Trap: A SiPM Upgrade for Very High Energy Astronomy and Beyond