The micro gap wire chambers and their electronics

The Micro Gap Wire Chambers (MGWC) proposed as tracking detectors are very compact wire chambers. They provide a 2D readout by reading the anode wires and the cathode strips. A very important parameter is the anode–cathode coupling which must be as high as possible to have comparable efficiency in both coordinate reconstructions. Using a 50 μm kapton substrate, an anode–cathode coupling higher than 95% was obtained. Short-signal rise time (<2 ns) and width (<20 ns) were also observed. To take advantage of these parameters a fast transimpedance amplifier (F–TRIA99) has been constructed. The first results obtained using this amplifier are also presented.