Breakdown Mechanisms for Laser-induced Plasmas in Super-high Pressure Gases
Author : Alfred Bart Howe
Publisher :
Page : 228 pages
File Size : 33,83 MB
Release : 1966
Category : Adaptive control systems
ISBN :
Author : Alfred Bart Howe
Publisher :
Page : 228 pages
File Size : 33,83 MB
Release : 1966
Category : Adaptive control systems
ISBN :
Author : Dennis Howard Gill
Publisher :
Page : 119 pages
File Size : 15,19 MB
Release : 1966
Category : Lasers
ISBN :
Possible mechanisms responsible for laser-induced breakdown in super-high pressure gases are investigated both theoretically and experimentally. It is shown that the breakdown mechanism involves energy gain of free electrons by acceleration in the incident electromagnetic field while undergoing collisions with neutrals, and subsequent electron-impact ionization. This mechanism is described by classical microwave breakdown theory and favorably compares with the experimental measurements. Experimental breakdown threshold data in He, Ar, H2, and N2 was obtained over the pressure range 100-30,000 psi. Plasmas are produced in He, Ar, H2, and N2 over the pressure range 100-30,000 psi. The radiation from a giant-pulse ruby laser is focused within a pressure cell having three quartz windows and capable of withstanding 60,000 psi. Breakdown threshold data is taken for comparison with theory. Kerr cell photographs of the focal region provide time resolution of the macroscopic growth of the plasma. Two possible mechanisms are evaluated: multiquantum absorption and electron-impact ionization. The latter is analyzed both quantum mechanically by the inverse Bremsstrahlung theory and classically by microwave theory.
Author : Arwin A. Dougal
Publisher :
Page : 6 pages
File Size : 42,54 MB
Release : 1967
Category :
ISBN :
The paper presents the results of validation experiments on the effects of laser induced breakdown of super-high pressure gases (7 to 2000 atmospheres). It was determined that the optical extension of the classical diffusion - controlled microwave breakdown theory correctly predicts a minimum in the electric field vs. pressure curve. The experiments identify electron impact as the responsible breakdown mechanism. (Author).
Author : Arwin A. Dougal
Publisher :
Page : 11 pages
File Size : 39,48 MB
Release : 1968
Category : Electric discharges through gases
ISBN :
Author :
Publisher :
Page : 1572 pages
File Size : 44,11 MB
Release : 1992
Category : Aeronautics
ISBN :
Author :
Publisher :
Page : 692 pages
File Size : 46,36 MB
Release : 1974
Category : Nuclear energy
ISBN :
Author : Seung Ho Baek
Publisher :
Page : 268 pages
File Size : 37,45 MB
Release : 1978
Category :
ISBN :
Author : United States. Air Force. Office of Aerospace Research
Publisher :
Page : 586 pages
File Size : 43,50 MB
Release : 1965
Category : Aeronautics
ISBN :
Author :
Publisher :
Page : 776 pages
File Size : 40,36 MB
Release :
Category : Science
ISBN :
Author :
Publisher :
Page : 1112 pages
File Size : 20,75 MB
Release : 1972-06
Category : Nuclear energy
ISBN :