Electron beam requirements for a three-dimensional Smith-Purcell backward-wave oscillator for intense terahertz radiation
Kwang-Je Kim, Vinit Kumar
Physical Review Special Topics. Accelerators and Beams · 2007
doi:10.1103/physrevstab.10.080702 (opens in a new tab)
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Abstract
A Smith-Purcell device can operate as a backward-wave oscillator for intense, narrow-bandwidth, continuous wave radiation at terahertz wavelengths. We determine the requirements on electron beam current and emittance for the system to oscillate based on a three-dimensional extension of our previous two-dimensional analysis. It is found that specially designed electron beams are required with a current that exceeds a certain threshold value and a flat transverse profile that allows the beam to travel very close to the grating surface. Two methods for producing electron beams with the required characteristics are discussed.
Abstract licence: CC BY
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