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32 high-rate capable SM2 Micromegas quadruplets are built, for the upgrade of the Small Wheels of the ATLAS muon spectrometer. The cathodes and strip-anodes of the 2 m2 quadruplets consist of stable honeycomb sandwiches with a requested planarity better than 80 μm. The qualification of full-size SM2 quadruplets will be performed in the Munich Cosmic Ray Measurement Facility (CRF). Two fully working...
Due to its wide band gap (2.68 eV) and high stopping power, thallium bromide (TlBr) is being investigated as a room-temperature semiconductor gamma-ray spectrometer. When cooled to −20°C, performance of better than 1% FWHM at 662 keV has been observed on 5×5×5 mm3 pixelated TlBr detectors. The room-temperature lifetime (under continuous bias) of thick TlBr detectors operated at high fields (∼2000...
A comprehensive study, supported by systematic measurements and numerical computations, of the intrinsic limits of multi-GEM detectors when exposed to very high particle fluxes or operated at very large gains is presented. The observed variations of the gain, of the ion back-flow, and of the pulse height spectra are explained in terms of the effects of the spatial distribution of positive ions and...
Thallium-bromide (TlBr) is currently under investigation as an alternative room-temperature semiconductor gamma-ray spectrometer due to its favorable material properties. Previous work has shown that 5 mm thick pixelated TlBr detectors can achieve sub 1% FWHM energy resolution at 662 keV. However, these results are mostly limited to −20 °C operation. In addition to good electron mobility, some TlBr...
CdZnTe imaging gamma-ray spectrometers using digital pulse processing techniques have shown great promise in recent years. The energy resolution of 15 mm thick CdZnTe spectrometers has improved to around 0.4 % FWHM at 662 keV for single pixel events and near 0.6 % FWHM at 662 keV using all events, regardless of the number of pixels triggered. Additionally, the position resolution through subpixel...
Our group has designed a family of ASICs dedicated to the readout of semiconductor detectors for space applications, named IDeF-X standing for Imaging Detector Front-end [1]-[3]. IDeF-X BD is a new member of the family. It has been optimized for the readout of low capacitor and low leakage current Silicon or Cd(Zn)Te detectors. IDeF-X BD has been designed in the standard AMS CMOS 0.35 μm process technology...
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...
Novel borosilicate microcapillary array MCPs have been employed build large area (20 cm × 20 cm) flat panel phototube detectors. Design of the 20 cm sealed tube assembly comprises of a borosilicate entrance window, a proximity focused bialkali photocathode, a pair of MCPs, and a strip-line readout anode. Micro-capillary arrays have been processed to function as microchannel plates (MCPs) using atomic...
Argonne National Laboratory (ANL) is currently developing 6 cm × 6 cm, all-glass body, sealed photodetectors based on Microchannel Plates (MCPs) functionalized by Atomic Layer Deposition (ALD). A Small Single Tube Processing System (SmSTPS) was constructed for fabricating the photodetectors. A number of first version devices were successfully produced and have shown satisfactory performances. Recently,...
Cadmium zinc telluride (CZT) detectors are highly promising for advanced PET imaging due to their high energy and spatial resolution. In this contribution, an improved data analysis is suggested for the small animal PET system currently under construction at Stanford. Improved energy resolution in positron emission tomography (PET) helps to exclude scattered events and is necessary for new strategies...
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