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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...
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...
MHSP operation in pure xenon
Luz, H. Natal da; Veloso, J. F. C. A.; Amaro, F. D.; Ferreira, L. F. Requicha; Santos, J. M. F. dos; Breskin, A; Chechik, R.We present latest results of a micro-hole and strip plate (MHSP) electron multiplier operating in pure xenon at atmospheric pressure. We report on avalanche gain of ~2×104, stable within ~3% after an accumulated charge of 4 [mu]C/mm2, when irradiated with 0.5 kHz/mm2 5.9 keV photons. No photon-induced secondary effects or discharges have been observed at this gain. An energy resolution of 14% was obtained with ...
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