A High Energy Electron Beam Monitor

Abstract
A high energy electron beam monitor which detects the Čerenkov light emitted in nitrogen gas at atmospheric pressure is described. The monitor is designed to have a constant sensitivity to electrons of energies above 200 MeV, to have a response time of less than 10−7 sec, and to have a current output which is linearly proportional to the beam intensity over a range of five decades. The results of tests made on the monitor are presented. The tests show that the monitor has a sensitivity, speed, range, and lack of dependence on beam position and background radiation which make it ideal for many monitoring applications.

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