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The development of gaseous detectors for single photon detection has been mainly triggered by the requirements of the Cherenkov imaging counters and three generation of detectors have been developed: the gaseous detector with converting vapors included in the gas atmosphere, the open geometry detectors with solid state CsI photocathodes, where no ion back flow limitation can be envisaged, and the...
A seven year-long R&D programme has been performed and the resulting detector architecture is a hybrid MPGD including two THick GEM (THGEM) multiplication stages followed a MICROMEGAS. The first THGEM board forms the photocathode support: its upper face is CsI coated. The properties of THGEM-based photocathodes have been studied in details. The two THGEM layers act as pre-amplification stages...
Gas detector of single photons are required in Cherenkov imaging counters, in particular when large surface must be instrumented. The present detectors suffer of severe limitations usually related to the ion and photon back flow to the photocatode. The principle and the status of novel photon counters based on Micro Pattern Gaseous Detector is discussed.
A pulsed laser method is used to map the charge collection amplitude and electron mobility-lifetime product (??e??e) in Cd1-xZnxTe (x = 0.1) pieces especially selected to include regions with crystallographic defects. Additionally, ultrasound imaging is used in conjunction with X-ray diffraction in order to localize and analyze the defects. The defect regions studied include twins, misoriented secondary...
A gas-based neutron detection system with individual readout method and comprising a micro-pixel detector head was constructed, and preliminary experiments were conducted under neutrons irradiation. The detection system also consisted of a micro-pixel detector head, a gas chamber that had feedthrough lines of 541 channels, amplifier-shaper-discriminator boards, position encoders with field programmable...
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