A two-step parallel plate chamber with a resistive germanium anode and a two dimensional readout for the detection of minimum ionizing particles

Abstract A parallel plate avalanche chamber specially suited for the high resolution detection of minimum ionizing particles (m.i.p.) is presented. The anode is made of a thin germanium layer with a sheet resistivity > 1 M Ω/p[ while the cathode is made of a nickel mesh having 600 line pairs/in. A chess board of pads placed behind the anode plane is used to obtain the positional information. A 100% detection efficiency, a 40 ns (fwhm) time resolution and a spatial resolution better than 140 μm (fwhm) for both coordinates have been measured

A microstrip gas avalanche chamber with two-dimensional readout

Abstract A microstrip gas avalanche chamber with a 200 μm anode pitch has been built and successfully tested in our laboratory. A gas gain of 104 and an energy resolution of 18% (FWHM) at 6 keV have been measured using a gas mixture of argon-CO2 at atmospheric pressure. A preliminary measurement of the positional sensitivity indicates that a spatial resolution of 50 μm can be obtained

A novel type of parallel plate chamber with resistive germanium anode and a two-dimensional readout

Abstract A parallel plate counter with a resistive anode and a two-dimensional readout is presented. The anode is made of a thin germanium layer with a sheet resistivity ⩾ 1 M ω /square and the cathode is made of aluminized mylar 5 μm thick. The anode is transparent to the fast impulse due to the collection of the multiplication electrons. A chessboard of "pads" placed behind the anode plane is used to obtain the positional information. The detector and the readout system are physically and logically separated. An overall spatial resolution of 70 μm (rms) for both coordinates has been measured

A microstrip gas chamber with true two-dimensional and pixel readout

A true two-dimensional μstrip gas chamber has been constructed and successfully tested. This new detector has an effective substrate thickness of less than 2 μm. An ion implanted oxide layer of 1.8 μm thickness provides the necessary insulation between the front and back plane and permits collection on the back electrodes of a large fraction of the induced charge. The back electrode signal is used to measure the coordinate along the anode strips (X-Y readout) or to provide true space points (pixel readout). Very good imaging capabilities have been obtained in both cases. A flux of 107 particles/mm2 s has been measured without significant gain loss. No charging effect has been observed after three days continuously running at a flux of 104 particles/mm2 s, while a 15% gain loss, probably due to ageing effects, has been measured after collection on the strips of a charge corresponding to the more than six years of running at the design luminosity of LHC, at 50 cm from the beam axis

Mathematical modelling of the performance of a MWPC

Abstract We have implemented the Erskine formalism for signal development to study in detail the main operational characteristics of a MWPC with a cathode read-out, for both point-like and extended ionization tracks. A parametrization has been made of the width of the cathode charge distribution and of the ratio of cathode charge over tottal avalanche charge to be applied for a general class of MWPCs. The integral and the differential nonlinearity of position measurements based on the calculation of the centroid of the cathode signals has been studies as a function of the width of the cathode read-out strips. Left-right and top-bottom assignment capability and interpolation between anode wires has been modelled. The possibility of measuring the angle of incidence of an ionizing particle with a delay-line cathode read-out is suggested

Production of pseudoscalar mesons in 300 GeV central π+N collisions

The exculsive production of π0, η, and η′ mesons in π+N central collisions has been studied with 300 GeV incident pions. The experiment has been performed at the CERN SPS. The gammas from decaying mesons were detected in the hodoscope multiphoton spectrometer GAMS-4000. The measured differential cross sections show a plateau in the longitudinal momentum interval 0.1<xF<0.3. © 1989 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The slow proton position-sensitive time of flight detector of the GAMS NA 12 2 experiment at CERN

A large time-of-flight detector has been built by the GAMS NA12/2 experiment at CERN. It surrounds a 60 cm long liquid hydrogen target. With a time resolution better than σ = 350 ps, pion/proton separation is achieved up to a 800 MeV/c momentum. © 1994.SCOPUS: ar.jinfo:eu-repo/semantics/publishe