Accession Number : ADD007736

Title :   Laser Plasmatron.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Conrad,Raymond W

Report Date : 18 Dec 1979

Pagination or Media Count : 4

Abstract : Plasma generation occurs when radiation from a high power, infrared laser is directed to a sufficiently short focal point to produce the irradiance required for producing a plasma or laser-supported combustion wave, with the assistance of external plasma initiation apparatus such as an electrode discharge. The laser beam is directed through a cylindrical or conical chamber to the electrode discharge means. The chamber allows a controlled flow of gas to be introduced into the chamber, flowing in the direction of the laser beam to exhaust at the end of the chamber. A plasma is ignited, using the plasma initiation device and is prevented from propagating up the laser beam by the opposing flow of gas. The position of the plasma along the laser beam axis and the plasma temperature are controlled by the velocity of the gas flow. As the gas velocity is increased, the plasma is forced to retreat into higher intensity regions of the converging laser beam, where it absorbs more energy from the beam thereby reaching higher temperatures. (Author)

Descriptors :   *Patents, *Plasma generators, *Laser beams, *Gas breakdown, High temperature, Infrared lasers, Electrodes, Focusing, Irradiation, Temperature, Velocity, Chambers, Gases

Subject Categories : Lasers and Masers
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE