Signal observation from minimum ionizing particles and time resolution estimation in the Triple GEM detector

99-009 Recently a Triple-GEM detector constructed at PNPI has been tested in a PSI hadronic beam (pions at 215 MeV/c and protons at 350 MeV/c). GEM-foils used in the detector have a pitch of 140 microns and hole size in Kapton of about 40 microns. The detector has a sensitive area of 100*100 mm^2 and a 2 mm drift gap. The anode plane contains strips with 300 microns pitch. The detector was operated with the mixture of 0.7Ar+0.3CO2 at a gas gain about 1*10**4. It has shown good operation reliability in high intensity hadron beams up to 3*10**6 Hz/cm^2. Signals from both sides of the induction gap, i.e. from the GEM and from the anode strips, have been recorded with the wide-band digital scope. The current pulses produced by MIPs in the detector have been reconstructed. The time resolution of the Triple-GEM detector has been estimated from the recorded data: rms=6ns

Wire pad chamber for LHCb muon system

2000-003 Wire pad chambers (WPC) have been proposed for the outer Region 4 of the LHCb Muon System. These are double gap MWPCs with small wire spacing allowing to obtain 99% detection efficiency in a 20 ns time window. The chambers have a rectangular shape with the vertical dimension from 20 cm in Station 1 to 30 cm in Station 5. The horizontal dimensions will be different with the maximal size of 3 meters in Station 5. The wires are in the vertical direction. The short wire length allows to use small wire spacing needed for high time resolution. Also, this helps to obtain the uniform gas gain over the whole chamber area. The WPC has one row of the wire pads formed by grouping wires in separate readout channels. Four WPC prototypes have been built at PNPI and tested in the PS beam at CERN. Here we report on the results from these tests. Also, the results of simulation of the WPC performance are presented

Wire pad chambers and cathode pad chambers for the LHCb muon system

A proposal for Wire-Pad-Chambers and Cathode-Pad-Chambers for the LHCb Muon system is presented. It is shown that a single technology satisfies the requirements of almost the entire detector, garanteeing maximum uniformity. The muon system layout based on this technology is shown, and the chamber geometry specifications together with electronics considerations are discussed. An overview of prototype results are presented, followed by considerations on ageing. Finally construction and cost issues are outlined

Design and construction of the wire chambers for the LHCb muon system

The LHCb muon system will use Multi-Wire Proportional Chambers (MWPC) in all regions with a particle flux between 1KHz/cm2 and 100 kHz/cm2. After an overview of the chamber requirements and specifications, the design and construction procedures including the quality control of the detector system are described. The electrical layout is discussed and finally the cost breakdown and the construction schedule is presented

Design and construction of the wire chambers for the LHCb muon system

The LHCb muon system will use Multi-Wire Proportional Chambers (MWPC) in all regions with a particle flux between 1KHz/cm2 and 100 kHz/cm2. After an overview of the chamber requirements and specifications, the design and construction procedures including the quality control of the detector system are described. The electrical layout is discussed and finally the cost breakdown and the construction schedule is presented