Thermal neutron response of a boron-coated GEM detector via GEANT4 Monte Carlo code

TPG is the acronym for Time Projection Chamber with GEM amplification, high-granularity hexaboard read-out and FADC electronics. We have constructed a TPG read-out module, called TPG-head, with three GEM foils and a multilayer board, called hexaboard, covered with 710 000 hexagonal pads of 300 mum size. The total active area of this module is a disk of 30 cm diameter. The 710 000 pads are read by three sets of 576 strips dephased by 120 degrees. Each strip is read by a FADC channel with 100 ns sampling time. The module is mounted in a test-bed formed by a cylindrical field cage of 80 cm diameter and 150 cm length inside a solenoidal magnet that operates with a magnetic field up to B=0.7 Tesla. Tests with X-ray sources show an intrinsic spatial resolution of the order of 40 mum. The threshold for transverse momentum measurement of low energy tracks is below 0.1 MeV/c with a magnetic field of 0.07 Tesla. At 0.7 Tesla the intrinsic space point resolution of the chamber is such that the error on the measurement of the transverse momentum is DeltaPtsime0.1 MeV/c in absence of distortions from the drift region

TPG, test results

Remarkable features of gas electron multipliers (GEMs) make them attractive for numerous applications in high-energy physics, nuclear physics, astrophysics, and the medical-imaging field. This review presents the results of research and development of GEM-based radiation detectors. The operating principles of GEMs and their main characteristics, including the physics of multistage GEMs and their operation in pure noble gases, are expounded. GEM-based detectors of ionizing radiations are considered. In particular, the data on tracking detectors are briefly described, while more detailed data, including the data on two-phase avalanche detectors, are presented for detectors operated at high pressures and cryogenic temperatures. A special Section is devoted to the development of GEM-based gas photodetectors.

Radiation detectors based on gas electron multipliers (Review)

TPG is the acronym for a 3D imaging gas chamber with GEM amplification, hexaboard read-out and FADC electronics We have constructed a TPG-head with three GEM foils (30 cm diameter) and a read-out board (30 cm diameter active surface) covered with 710000 hexagonal pads of 300 /spl mu/m size The aligned pads are connected in parallel to one strip out of three sets of 576 parallel strips (500 /spl mu/m pitch) The three sets of strips run at 120 degrees from each other and at three different depths inside the hexaboard multi-layer structure Each strip is read by FADC electronics The TPG-head is under initial test in a small container with a drift volume 33 mm long and of 30 cm diameter A 150 cm long drift volume inside a 07 Tesla solenoidal magnetic field has been prepared by using HARP-TPC instrumentation as a test bed

Progress in TPG construction [particle detector]

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TPG, test results

Progress in TPG construction [particle detector]