Thermionic electron beam is a fundamental part of linear accelerators in the field of Experimental High Energy Physics (EHEP). Thermionic type of beam is very economical and easy to produce as compared to the other electron beam sources. In this work, we give an overview of generation, design and applications of the electron beam with particular reference to e-beam generation at high energy physics linear accelerators. The data, which is available in the literature is presented in tabular form for ready reference. In order to have a feel of the vast applications of e-beam technology, we elaborate an e-beam source developed in our laboratory.
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