Accession Number:

AD0749553

Title:

Atomic Collisional Rate and Ionization Relaxation Study in a Helium Shock Wave,

Descriptive Note:

Corporate Author:

TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s):

Report Date:

1972-03-01

Pagination or Media Count:

98.0

Abstract:

A theoretical and experimental study of the initial ionization phase of an ionizing helium shock wave has been accompished. Ionization relaxation time and the electron density profile behind the shock translational front, have been measured. Both of these parameters have strong dependence upon the atomic collisional excitation rate in the initial phase of the ionizing shock wave and therefore a comparison with theory led to an estimation of atom-atom collisional excitation cross-section. Theoretical predictions for the relaxation zone of the helium shock wave, indicated only a weak coupling between the electron and atom temperature during the relaxation process, contrary to the results found for hydrogen. A plasma focus driven shock tube was used to create the appropriate helium shock waves. Preliminary results were obtained using a Fray-Perot laser interferometer. Author

Subject Categories:

  • Physical Chemistry
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE