Downstream Ray Tracing in Beam Optics Codes.

Abstract

Tunnel emittance growth in beams is a subtle phenomenon which requires the use of highly accurate simulation codes and methods to achieve reliable results. This report discusses use of self-consistent beam optics codes in studies of emittance growth in very long PPM focused electron beams. A novel method by which a given problem can be accurately solved in a stairstep series downstream is presented. The deformable mesh code is used to simulate a gridded gun focused by a double period magnetic field used in a high power coupled cavity traveling-wave tube. Solution coupling across the boundary is presented in detail. The study also uncovered a fundamental problem with paraxial based codes (Neuman boundary implicit) making their use unsuitable in emittance growth studies. Keywords: Electron beams; Beam optics; Paraxial based codes; Electron optics; Simulation codes; Periodic permanent magnets. (jhd)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1988
Accession Number
ADA204895

Entities

People

  • Wilfredo B. Reyes

Organizations

  • University of Utah

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Availability
  • Boundaries
  • Computational Fluid Dynamics
  • Computational Science
  • Electron Beams
  • Electron Guns
  • Electron Optics
  • Electrons
  • Emittance
  • Engineering
  • Magnetic Fields
  • Microwave Tubes
  • Ray Tracing
  • Simulations
  • Traveling Wave Tubes

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Computational Modeling and Simulation
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Microelectronics