Abstract

The rise-time method as a position sensitive read-out of a proportional chamber is investigated. An expression is derived for the pulse form at the end of the wire as a function of time and position of the discharge. With a proper termination the response of the line can be made linear. From the pulse form the zero-cross time, linearity and sensitivity are calculated. The calculations were experimentally verified with a 30 cm long resistive wire detector. An expression for the noise is derived and the influence of the filter time constants on the resolution is discussed.

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