Efficiency and uniformity measurements of a light concentrator in combination with a SiPM array

A position sensitive Cherenkov detector was built, consisting of 64 SiPMs with an active area of 3 3 mm 2 and a pixel size of 100 100 m 2 . The sensitive area is increased by a light concentrator which consists of 64 pyramid-shaped funnels. These funnels have an entrance area of 7 7 mm 2 and an exit area of 3 3 mm 2 , guaranteeing a su cient position resolution e.g. for the barrel DIRC detector of the PANDA experiment at FAIR. The e ciency and uniformity of the light concentrator in combination with the SiPM array was tested by scanning the array in two dimensions, using a pulsed light beam. Results of these tests and comparison with simulations are given here.