A High-Resolution Beam Intensity Profile Monitor

This paper describes an intercepting beam intensity profile and position monitor which was developed at SLAC. It has excellent spacial resolution as well as signal efficiency. The instrument utilizes the electromagnetic cascade shower emission effect. Net charge leakage signals comparable in magnitude to the intercepted beam current are easily obtainable. The latest model of the instrument is described. It consists of an array of closely spaced 0.0025 cm thick tungsten ribbons which are 2 r.1. long in beam direction. Experimental results as well as application of the basic idea to four different instruments are discussed. The instruments are: (1) a spectrum analyzer, (2) a vertical beam position monitor, (3) a ring inflection monitor for the SLAC electron-positron storage ring project, and (4) an accelerator beam phase space measurer.