Design of High Power FELS and the Effects of Diffraction on Detuning in an FEL Oscillator

Abstract

In experiments going back to the first free electron laser (FEL) oscillator at Stanford, the measured width of the desynchronismcurve is often significantly greater than predicted by theory and two-dimensional (2D) simulations in (z; t). The results of new four dimensional(4D) simulations in (x,y,z,t) show that this difference can be explained by the effects of diffraction. When the light isartificially constrained to remain in the cavity fundamental mode, 2D and 4D simulations give similar results, but when the light isallowed to self-consistently develop higher-order modes, the 4D simulations give different results that agree better with experiments.The results of new 4D simulations also show the effects of emittance versus electron beam energy and mirror shift versus mirror tilton extraction. Analysis of these results examine the robustness of FEL designs.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2015
Accession Number
AD1009202

Entities

People

  • Michael J. Price

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Diffraction
  • Directed Energy Weapons
  • Electron Beams
  • Electron Energy
  • Electrons
  • Energy Transfer
  • Four Dimensional
  • Free Electron Lasers
  • Free Electrons
  • Laser Beams
  • Lasers
  • Linear Accelerators
  • Power Spectra
  • Radiation
  • Simulations
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Marksmanship and Weaponry.
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Microelectronics