Accession Number:

AD0659740

Title:

LOCALIZED DIAGNOSTIC POSSIBILITIES OF SELECTIVE EXCITATION SPECTROSCOPY,

Descriptive Note:

Corporate Author:

TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s):

Report Date:

1967-09-01

Pagination or Media Count:

50.0

Abstract:

A new approach to the attainment of localized information about the condition of a plasma is proposed and a practical example is discussed in detail. In this alternative technique a given atomic transition, within one of the species comprising the plasma, is optically pumped to produce a localized region of enhanced population in the upper state of the transition. This gives rise to an intensification of the spontaneous emission arising from this upper state. Such intensified emission contains information about the conditions within the pumped region of the plasma and can be detected against the background radiation from the rest of the plasma provided, the excitation temperature is small compared to the energy separation of the two states comprising the transition. It is shown that for plasmas seeded with potassium localized values of electron temperature and number densities should be attainable with the use of a pulsed ruby laser operating at a temperature of about -60C. Furthermore because this technique involves the use of a pulsed laser, temporal as well as spatial resolution is possible. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE