Right-left ambiguity resolution in a time expansion chamber

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Abstract

In a Time Expansion Chamber two high resolution drift volumes on both sides of a small detection gap are separated from the gap by a fine grid wire plane. The charge asymmetry induced on the grid wires in the vicinity of an anode is used to resolve the right-left ambiguity. It is the only method which is fast enough for a first level trigger and which does not deteriorate the necessary field homogeneity.

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