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Title: Axial interaction free-electron laser

Electron orbits from a helical axial wiggler in an axial guide field are absolutely unstable as power is extracted from the particles. For off-axis beams an axial FEL mechanism exists when the axial electric field in a TM mode is wiggled to interact with the axial velocity of the electrons that form the beam. The interaction strength is comparable to that for helical FELs and is insensitive to beam orbit errors. The orbits for this mechanism are extremely stable in the absence of space charge and lead to high extraction efficiencies without particle phasing incoherence or interception. This interaction mechanism is suitable for use with intense annular electron beams for high power generation at microwave frequencies.
Inventors:
 [1]
  1. (Los Alamos, NM)
Issue Date:
OSTI Identifier:
871133
Assignee:
Regents of University of California, Office of Technology (Alameda, CA) LANL
Patent Number(s):
US 5663971
Contract Number:
W-7405-ENG-36
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
axial; interaction; free-electron; laser; electron; orbits; helical; wiggler; guide; field; absolutely; unstable; power; extracted; particles; off-axis; beams; mechanism; exists; electric; tm; mode; wiggled; interact; velocity; electrons; form; beam; strength; comparable; fels; insensitive; orbit; errors; extremely; stable; absence; space; charge; lead; extraction; efficiencies; particle; phasing; incoherence; interception; suitable; intense; annular; generation; microwave; frequencies; microwave frequencies; electric field; electron beam; electron laser; electron beams; power generation; space charge; extraction efficiencies; guide field; annular electron; axial electric; wave frequencies; free-electron laser; tm mode; /372/315/