Experimental Investigation of Emittance Growth in Particle Beams Using Directly Heated Lanthanum Hexaboride Cathodes

Abstract

This report presents the theory of nonlinear field energy as applied to emittance growth in a space charge dominated particle beam. An experiment to validate this theory is described and the experimental apparatus and results are presented. The experimental apparatus is designed around a directly heated lanthanum hexaboride (Lab6) cathode which yields a variable radial intensity electron distribution. We report the first use of such an electron gun, and its initial operating characteristics, which compare favorably with predicted theory. Keywords: Emittance growth, Particle beams; Lanthanum hexaboride; Cathodes; Nonuniform radial intensity distribution; Electron gun.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1988
Accession Number
ADA199648

Entities

People

  • David L. Young
  • M. Mcharg

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Classification
  • Compound Semiconductors
  • Electron Emission
  • Electron Guns
  • Electrons
  • Emission
  • Emittance
  • Intensity
  • Lanthanum
  • Measurement
  • Optical Pyrometers
  • Particle Beams
  • Particles
  • Plastic Explosives
  • Power Supplies
  • Security

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Plasma Physics.
  • Spectroscopy.

Technology Areas

  • Directed Energy
  • Microelectronics
  • Space
  • Space - Hall-Effect Thruster