An Automatic Recorder of the Spark Chamber

Abstract

An automatic digitizing-recording system of the spark chamber by means of television vidicon cameras is constructed. It is possible to record two spark columns in one gap simultaneously, and two cameras are used to define the position of a spark column. One picture is decomposed into 200 horizontal sweep lines in one vertical sweep; among them 40 sweeps are arbitrarily selected for the digitization according to the structure of the chamber. The digitization area (67% of the sweep length) is divided into 1000 scales and the position of the spark is represented by the 3 digital numbers. The capacity of the memory is just enough to memorize a set of stereoscopic pictures of an event. At present, the position of the spark is determined with an error of scale 2, the resolving power of two lines is about scale 7 and the linearity between the geometrical position and the digitized result is good.