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Title: Axial interaction free-electron laser

Abstract

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:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
871133
Patent Number(s):
5663971
Assignee:
Regents of University of California, Office of Technology (Alameda, CA)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
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/

Citation Formats

Carlsten, Bruce E. Axial interaction free-electron laser. United States: N. p., 1997. Web.
Carlsten, Bruce E. Axial interaction free-electron laser. United States.
Carlsten, Bruce E. Wed . "Axial interaction free-electron laser". United States. https://www.osti.gov/servlets/purl/871133.
@article{osti_871133,
title = {Axial interaction free-electron laser},
author = {Carlsten, Bruce E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {1}
}

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Works referenced in this record:

Measurement of the temporal and spatial phase variations of a pulsed free electron laser amplifier
journal, January 1994


Stable off-axis electron orbits and their radiation spectrum in a helical wiggler
journal, June 1985

  • Takeda, H.; Segall, S.; Diament, P.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 237, Issue 1-2
  • https://doi.org/10.1016/0168-9002(85)90341-9

Stable off‐axis electron orbits in a longitudinal‐wiggler free‐electron laser
journal, August 1995