Soft X-Ray Studies of Channel Multipliers and Multiplier Arrays

Measurements of pulse height distributions, gain and photon detection efficiency have been made for channel electron multipliers in the soft x-ray region. In the case of channel arrays, double exponential pulse height distributions have been found, and contact noise problems encountered. The variation of detection efficiency with angle of the incident beam and the uniformity of gain and efficiency over the cathode face have been studied. Results are given of a preliminary investigation of array operating lifetime. The detection efficiency over the cathode of a coned single channel was measured, and a comparison for angular variation between coned and plain cathode detectors is presented.