Simulation of Longitudinally Modulated Electron Beams

There has been recent interest in creating electron beams with periodic density modulation, created by applying several sub-picosecond laser pulses to a photocathode. Applications include creating terahertz radiation. The topic is also of interest for understanding how to suppress unwanted radiation...

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Bibliographic Details
Main Authors: Neuman, C. P., O'Shea, P. G.
Format: Conference Proceeding
Language:English
Subjects:
ELECTRON BEAMS
LASERS
LINEAR ACCELERATORS
PARTICLE ACCELERATORS
PERIODICITY
PHOTOCATHODES
SIMULATION
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Summary:There has been recent interest in creating electron beams with periodic density modulation, created by applying several sub-picosecond laser pulses to a photocathode. Applications include creating terahertz radiation. The topic is also of interest for understanding how to suppress unwanted radiation in this frequency regime. Recent studies show that such density modulated beams lose their density modulation in favor of energy modulation when transported through a linear accelerator system. Thus, it would be useful to simulate beams that have only density modulation and beams that have only energy modulation. The former would be useful for learning how to keep the desired density modulation for beams intended to create terahertz radiation, the latter for learning how to suppress unwanted energy modulation, which may have originated as density modulation. In this study, PARMELA and other simulation tools are used to investigate these cases. Results provide a better understanding of the evolution of electron beams with sub-picosecond modulations. Parameters in the simulations are chosen to correspond to existing accelerator systems so that the results may be used to support an experimental study.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2409193