Accession Number : AD0759567

Title :   Air Breakdown Studies.

Descriptive Note : Technical rept. 4 Mar 71-17 Jun 72,

Corporate Author : AVCO EVERETT RESEARCH LAB INC EVERETT MASS

Personal Author(s) : Schlier,Robert E. ; Pirri,Anthony N. ; Reilly,Dennis J.

Report Date : FEB 1973

Pagination or Media Count : 98

Abstract : S 3 X 10 TO THE POWER OF 6 WATT/SQUARE CM. The breakdown occurred at a variable time after the onset of radiation, with delays typically in the 10 to 30-microsecond range, although both shorter and longer times were observed. Similar results were obtained with 20 to 30-micron diameter calcium carbonate particles. Open shutter and time-resolved photography showed that the breakdown was characterized by the formation of a pre-breakdown luminous vapor or plasma region. The laser used for the investigation was an electron beam-sustainer discharge gas laser with an output up to about 80 joules in a pulse of 100 microseconds duration. The laser beam was close to diffraction limited. The experiments were carried out at beam diameters ranging from 0.013 to 0.22 cm (at the half intensity points). (Author Modified Abstract)

Descriptors :   (*AIR, *GAS IONIZATION), CHARGED PARTICLES, AEROSOLS, ELECTRON BEAMS, MICROWAVES, STATISTICAL ANALYSIS, GAS LASERS, HEATING

Subject Categories : Physical Chemistry
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE