High-Current-Density Thermionic Cathodes and the Generation of High-Voltage Electron Beams

Abstract

The project entitled 'High-Current-Density Thermionic Cathodes ' and 'High Voltage Electron Beams From Thermionic Cathodes' is aimed at developing a thermionic cathode of high current density for use intense electron-beam generators. The emitting material under study is lanthanum hexaboride (LaB6). The project breaks down into 3 major parts: development of methods for heating LaB6 disks to the emission-temperature range of 1800 deg C; measurement of the emission-current distribution over the cathode surface and correlation with thermionic-emission theory; and design and testing of an electron-gun diode with an LaB6 cathode which would be a prototype for use in an intense beam generator. Keywords: LaB6, Lanthanum hexaboride, High-current density thermionic cathodes, High-voltage electron beams.

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Document Details

Document Type
Technical Report
Publication Date
Apr 30, 1989
Accession Number
ADA223702

Entities

People

  • George Lipscomb
  • Kelly D. Pearce
  • Marc E. Herniter

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Control Systems
  • Electrical Engineering
  • Electrodes
  • Electron Emission
  • Electron Guns
  • Electrons
  • Energy
  • Free Electron Lasers
  • Free Electrons
  • Geometry
  • Laser Applications
  • Lasers
  • Materials
  • Measurement
  • Specific Heat
  • Work Functions

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Microelectronics