Readout electronics for the Venus TRD at TRISTAN

A large cylindrical transistor radiation detector (TRD) has been constructed as a part of the Venus detector for the TRISTAN e/sup +/e/sup -/ collider. The TRD has a total of 2688 channels of readout electronics. The electronics employs the method of charge sensitive preamplifiers and trapezoidal shaping networks. The circuit has typically an 11-b linearity. The gas gain of each X-ray chamber is tracked with an accuracy of +or-1% by monitoring 5.9-keV X-ray signals of a /sup 55/Fe source. The noise pickup has been minimized. The TRD gives a pion rejection factor of about 13(30) for 90%(80%) electron efficiency over the wide momentum range between 1 and 30 GeV/c. Full details of the readout electronics, the electronics for wire-gain control and the performance of the detector are given.<
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