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Comparative studies of MSGC and GEM for photon and electron detection at ambien...
Mir, J. A.; Conceição, A. S.; Maia, J. M.; Veloso, J. F. C. A.; Santos, J. M. F. doshttp://www.sciencedirect.com/science/article/B6TJM-4TN0KR6-4/2/96e0a99e3367107c66c9d9bbccd7e9db
Further studies on the gain properties of a Gas Electron Multiplier with a Micr...
Mir, J. A.; Stephenson, R.; Rhodes, N. J.; Schooneveld, E. M.; Luz, H. Natal da; Veloso, J. F. C. A.; Santos, J. M. F. dos; Azevedo, C. D. R.A Gas Electron Multiplier with Micro-Induction Gap Amplifying Structure (GEM-MIGAS) is formed when the induction gap of the GEM is set between 50 and 100 [mu]m using kapton pillars spaced at regular intervals. This configuration combines the properties of a GEM and Micromegas, allowing operation in tandem to generate high charge gains. We measured the essential operational parameters of this system using argon-...
A simple X-ray position detection system based on a MHSP
Luz, H. Natal da; Veloso, J. F. C. A.; Santos, J. M. F. dos; Mir, J. A.A simple system for position detection based on a Micro-Hole and Strip Plate (MHSP) using a resistive charge division method was implemented. A thin resistive layer of about 100 [Omega] between each strip (top surface) and between each anode strip (bottom surface) allows us to obtain the actual position in both orthogonal directions. The readout electronics uses only two preamplifiers, a sum and a divider circu...
Micro-Hole and Strip Plate (MHSP) operation in CF4
Luz, H. Natal da; Mir, J. A.; Veloso, J. F. C. A.; Santos, J. M. F. dos; Rhodes, N. J.; Schooneveld, E. M.The Micro-Hole and Strip Plate (MHSP) is a hybrid electron multiplier which combines the working principles of a Gas Electron Multiplier (GEM) and a Micro-Strip Gas Counter (MSGC). The compact double stage electron multiplication processes found in the MHSP enables the realisation of higher gas gain than the lone GEM operation. Thermal neutron detection using gas detectors involves the use of gas with another s...
Short induction gap gas electron multiplier (GEM) for X-ray spectroscopy
Mir, J. A.; Stephenson, R.; Rhodes, N. J.; Schooneveld, E. M.; Veloso, J. F. C. A.; Santos, J. M. F. dosExperimental work was carried out to evaluate the performance of a Gas Electron Multiplier (GEM) operated with a micromesh readout plane that enabled the induction gap to be set at 50 [mu]m. We measured the essential operational parameters of this system using Ar(75%)-isobutane (25%) as the counter gas mixture. The measurements included the effective gain, effective gain stability, and the X-ray energy resoluti...
MHSP with position detection capability
Luz, H. Natal da; Veloso, J. F. C. A.; Mendes, N. F. C.; Santos, J. M. F. dos; Mir, J. A.The first implementation of a position sensitive readout for a Micro Hole and Strip Plate (MHSP) is described and tested. The readout consists on a resistive layer crossing the anodes and connected to a preamplifier on each side. By weighing the charge pulses on both preamplifiers it is possible to determine the interaction point. A 100-200 [Omega] resistance layer between consecutive strips was found to be the...
Application of the microhole and strip plate detector for neutron detection
Veloso, J. F. C. A.; Amaro, F.; Santos, J. M. F. dos; Mir, J. A.; Derbyshire, G. E.; Stephenson, R.; Rhodes, N. J.; Schooneveld, E. M.We introduce the microhole and strip plate (MHSP) detector as a micropattern detector for the detection of thermal and epithermal neutrons. Detection sensitivity is obtained by filling these detectors with 3He at high pressures. We propose the use of argon-xenon penning mixtures as the stopping gas as opposed to the usual carbon based stopping gases. These argon-xenon mixtures provide suitable gas gains for the...
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