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[en] Results are presented from an ongoing study of single photon detectors for use in a ring-imaging Cerenkov counter. New results on the operation of parallel plate avalanche gaps are presented
[en] The Compressed Baryonic Matter (CBM) experiment at the future FAIR (Facility for Antiproton and Ion Research) complex will investigate the phase diagram of strongly interacting matter at high baryon densities and moderate temperatures in A+A collisions from 2-11 AGeV (SIS100) beam energy. One of the key detector components required for the CBM physics program is the RICH (Ring Imaging CHerenkov) detector, which is developed for efficient and clean electron identification and pion suppression. The CBM-RICH detector is being planned with gaseous radiator and in a standard projective geometry with focusing mirror elements and photon detector planes. One of the important criteria for the selection of appropriate mirrors is their optical surface quality (surface homogeneity). It defines the imaging quality of projected Cherenkov rings, and directly effects the ring finding and fitting performance. The global homogeneity has been tested with the D0 measurement. Local deformations e.g. by the mirror holding structure can be investigated with the Ronchi test and Shack-Hartmann method from which first results are discussed in this contribution.
[en] The design choices for 4π ring imaging Cerenkov counters -- both those of principle and those of practice -- are reviewed. The progress in construction and the performance of the devices being built for DELPHI and SLD are discussed. 13 refs., 22 figs
[en] An R and D project was started to develop a gaseous detector of single UV photons, able to stably operate at high gain and high rate, and to provide good time resolution and insensitivity to magnetic field, as required by the next generation of Ring Imaging Cherenkov Counters. The detector is based on the use of a novel and robust electron multiplier, the THGEM, arranged in a multilayer architecture, where the first layer is coated with a photosensitive CsI film. A systematic study of the response of single layer THGEMs with various geometries and different conditions was performed and several small photon detector prototypes have been built, tested in laboratory and operated in test beam exercises during 2009 and 2010 at the CERN H4 beam line. Evidence for the efficient detection of Cherenkov photons has been obtained, with stable operation in the test beam environment; the typical gain was about 105 and the time resolution was better than 10 ns.