An analysis of spark chamber operation

The characteristics of a spark chamber containing a neon alcohol mixture are described with particular reference to the variation of efficiency with the parameters of the pulse and the determination of the spark formation time. .An interpretation is made on the basis of a model for spark formation and the validity of the mechanism is examined by an internal comparison of the data. The results are used to derive the electron drift velocity as a function of field over the range of E/p from 0.05 to 4 v cm(^-1)(mm Hg)(^-1) and to determine the probability of a single electron initiating a spark. This is found to be 0.25. Measurements are also reported on the effect of electron attachment and on the geometrical properties of the sparks. Conditions are studied both for minimising the angle between the direction of the particle trajectory and the ensuing spark, and for reducing the error in location of the trajectory (0.2 mm).Conclusions on the design of spark chambers are presented and a historical review of the development of the spark chamber as well as a survey of the different types of spark chambers developed Up to the present time are given.