PULSE HEATING OF MATERIALS BY HIGHLY CONCENTRATED ELECTRON BEAMS

Abstract

Electron bombardment provides a means of heating with high local energy concentration and definition. The object is to investigate surface explosions and structural changes of matter caused by high temperatures, large temperature gradients and fast quenching rates connected with electron bombardment. It is intended to operate close to the absolute limits of energy concentration in electron beams. A theoretical study was made of the mechanism of electron beam focusing to determine the maximum obtainable beam compression. Results show that for low perveance beams the compression limit is set by the laws of thermodynamics. For high perveance beams, the thermodynamic limit cannot be reached because the electric and/or magnetic fields required become technically impossible. A numerical example illustrates this. An existing high perveance electron gun with a high area convergence ratio was adapted for the planned experiments. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1961
Accession Number
AD0269969

Entities

People

  • Oskar Heil
  • Siegfried Vogel

Tags

DTIC Thesaurus Topics

  • Compression
  • Convergence
  • Electron Beams
  • Electron Guns
  • Electrons
  • Energetic Materials
  • Explosions
  • High Temperature
  • Isotherms
  • Magnetic Fields
  • Materials
  • Quenching
  • Temperature Gradients

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Plasma Physics / Magnetohydrodynamics
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy
  • Microelectronics