Abstract
Improved thermionic guns may provide picosecond bunch lengths, gigahertz repetition rates, and high average current.
Highlights
Microwave thermionic electron guns were developed at Stanford in the early 1980’s in response to the need for a source of high peak current electron bunches operable at gigahertz rep rates with emittances adequate for operation throughout the infrared and visible spectral regions
The design developed by Glen Westenskow and John Madey (Fig. 1) proved highly successful in this application, serving as the basis of a compact free-electron laser (FEL) system [1] well suited for both fundamental FEL research at wavelengths extending to 350 nm in the visible [2] as well as applications in medicine and materials science including the first use of an FEL in human surgery [3]
As the emphasis in the development of this gun was on high macropulse peak and average currents, the emittance cited in Table I could
Summary
Microwave thermionic electron guns were developed at Stanford in the early 1980’s in response to the need for a source of high peak current electron bunches operable at gigahertz rep rates with emittances adequate for operation throughout the infrared and visible spectral regions. As reviewed at further length below, the tolerable limits on these changes in bunch length and phase determine the allowable increase in cathode current during each macropulse These effects of increased beam loading due to back-bombardment can in principle be limited by lowering the Q of the gun cavity to reduce the change in shunt impedance due to the change in cathode current, it would be preferable from the standpoint of system efficiency to limit the change in cathode surface temperature by reducing
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