June 1984

Document Type


Degree Name



Dept. of Applied Physics


Oregon Graduate Center


The Zr/W point cathode electron source is a high brightness, low noise point source of electrons which has been used in several electron optical systems. It has the capability of forming a high current, narrow cone angle focused electron beam at a relatively large working distance. In particular, it exceeds the performance of the LaB6 thermionic cathode, its closest competitor, in systems where a sub-quarter micron, several nanoampere electron beam is required. In order to apply this emitter to an electron optical system, characteristics such as angular intensity distribution, beam energy spread, beam noise, I-V curves, electron gun transmission and virtual source size should be known as a function of emitter radius, current density, temperature and other variable parameters. The present work covers all of the above characteristics except energy spread. Experimental data, theoretical explanations and computer simulations are included.





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