A Moment Approach to Modeling Negative Ion Sources.

Abstract

Applications in low energy kinetic studies, high energy accelerator technology and beam heating in fusion studies have fostered experimental and theoretical studies of the volume production of negative hydrogen ions in a magnetic multicusp discharge. In this study, a self-consistent approach based on Maxwellian moments of the Boltzmann equation is presented. The departure of the electron energy distribution fro a Maxwellian is also discussed and incorporated. The results of this model for discharge currents ranging from 1-100 A, for pressures ranging from 1-100 mTorr, and for voltages ranging from 20-100 V are compared to previous studies. Finally, scaling laws with discharge current, gas pressure, and discharge voltage are established and used to predict the optimum operating regime for a magnetic multicusp ion source.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1987
Accession Number
ADA188858

Entities

People

  • David E. Bell

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force
  • Birds
  • Boltzmann Equation
  • Charged Particles
  • Directed Energy Weapons
  • Electron Density
  • Electron Energy
  • Electrons
  • Energy Transfer
  • Ion Density
  • Ion Sources
  • Ions
  • Magnetic Fields
  • Measurement
  • Momentum Transfer
  • Protons
  • Weapon Systems

Fields of Study

  • Physics

Readers

  • Battery Technology and Engineering
  • Plasma Physics / Magnetohydrodynamics
  • Theoretical Analysis.

Technology Areas

  • Microelectronics