Accession Number : AD0800736

Title :   INFRARED MASER INTERFEROMETRY FOR TIME AND SPACE RESOLUTION OF ELECTRON DENSITY IN HIGH TEMPERATURE PLASMAS.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS UNIV AT AUSTIN LABS FOR ELECTRONICS AND RELATED SCIENCE RESEARCH

Personal Author(s) : Gribble, Robert Fonda ; Craig, J. P. ; Dougal, Arwin A.

Report Date : 15 OCT 1964

Pagination or Media Count : 70

Abstract : A 3.39 micron He-Ne maser excited infrared interferometer was utilized for the investigation of time and space resolved electron density in a high temperature, dense plasma formed in the 'theta-pinch' geometry. Dispersion of the coherent infrared radiation by the plasma electrons within an external resonator pulls the frequency of the coupled maser resonator with a resultant change in intensity. A spherical mirror focuses the maser beam at the center of a 20 cm length coil. The depth of focus is such that the beam diameter is less than 1 mm over the length of the plasma contained in a 46 mm ID Pyrix plasma tube with quartz end windows. The external resonator is formed by placing a second spherical reflector's radius of curvature. This spherical reflector returns the maser beam upon itself; its position is such that refraction effects by electron density gradients in the plasma are minimized. In order that the maser modulation might have a well defined waveshape and wide bandwidth, the resonators are operated with low coupling and at a relatively low Q. The maximum measurable electron density time variation of 3 times 10 to th 16th power/cubic cm microns is achieved with a fast In As infrared detector.

Descriptors :   *ELECTRON DENSITY), *PLASMAS(PHYSICS)), (*MASERS, (*INTERFEROMETERS, RESOLUTION, HIGH TEMPERATURE, TIME, INFRARED RADIATION, HIGH SPEED PHOTOGRAPHY, NEON, MAGNETIC FIELDS, MAGNETIC PINCH, RADIOFREQUENCY POWER, NEUTRONS, X RAYS, HELIUM, PLASMA MEDIUM, MODULATION, OSCILLATION, PLASMAS(PHYSICS), INFRARED DETECTORS, PROBES(ELECTROMAGNETIC), KERR CELLS, PHASE SHIFT CIRCUITS, TIMING CIRCUITS, TRIGGER CIRCUITS.

Subject Categories : Electrical and Electronic Equipment
      Lasers and Masers
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE