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Title: Analysis of electron dynamics and two mechanisms in a coaxial magnetic wiggler

The electron dynamics in a coaxial magnetic wiggler are analyzed numerically and studied in particle-in-cell (PIC) simulation. Electrons wiggle in angular direction to coherently generate a TE{sub 01} mode, and the results are consistent with each other. The trajectory of the electron in 3-D space and the effects on the trajectories of the initial phases of wiggler magnetic fields are researched, which helps to choose appropriate initial phases to control the trajectory of the electron. An oscillator of FEL with a coaxial magnetic wiggler based on a quasi cavity is designed for efficiently generating the TE{sub 01} mode with the high saturation power and high efficiency. The advantages of the quasi cavity structure are analyzed and the parameter-selection rules are investigated. Based on the electron dynamics, the process of electron bunching in the self amplified spontaneous emission (SASE) and the Seeded mechanisms are studied. The Seeded mechanism could accelerate electron bunching greatly and reduce the saturation time than the SASE by half.
Authors:
; ; ; ; ; ;  [1] ;  [1] ;  [2]
  1. Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22407941
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; DYNAMICS; EFFICIENCY; ELECTRONS; EMISSION; FREE ELECTRON LASERS; LASER CAVITIES; OSCILLATORS; SELECTION RULES; THREE-DIMENSIONAL CALCULATIONS; TRAJECTORIES; WIGGLER MAGNETS