New type of position sensitive photomultiplier

A position sensitive photomultiplier of a new concept is presented which is based on the scaling property of the equation of motion describing electrons moving inside electric and magnetic fields. The idea has been fully supported by a test using a prototype having ten stages of specially designed dynodes. A gain of 105–106, and a spatial resolution of ∼3.4 mm (FWHM) in two‐dimensional space have been obtained. The time resolution is comparable or superior to that of most conventional photomultipliers. An example of data handling of signals coming from divided anode cells showed a possibility of reconstructing impact light position with a precision of a few hundred microns.