Accession Number:

ADP007058

Title:

Radiation Cooling in Photopumped C VI Inversion,

Descriptive Note:

Corporate Author:

LEHIGH UNIV BETHLEHEM PA DEPT OF PHYSICS

Personal Author(s):

• Pakula, Ricardo A.

Report Date:

1992-05-22

Pagination or Media Count:

5.0

Abstract:

Radiation cooling as a means to reach inversion in photoionized C VI is analyzed in the context of energy transfer between excited ions and free electrons. The application of this scheme for the specific case of a hydrogen-like C VI plasma, exposed to the soft x-ray emissions of a titanium-laser-produced plasma was considered. Necessary conditions for the achievement of inversion are a low plasma temperature approx. 10 eV, and a high electron density approx. 10 to the 19thcu. cm. Both are required for the establishment of a strong collisional-recombination regime, favouring the cascading of electrons towards the upper excited levels, leaving the lower levels almost unpopulated. Radiative cooling was originally proposed as a means to reach the desired temperature in similar recombination schemes, however posterior work has shown that his regime was not attainable for low-Z materials. In this paper we consider in detail the hypothesis of radiative cooling for the case of C VI pumped by the Ti-plasma.

Descriptors:

• *PLASMAS(PHYSICS)
• *COHERENT OPTICAL RADIATION
• *IONIZING RADIATION
• SOFT X RAYS
• IONIZATION
• TITANIUM
• ELECTRON DENSITY
• SHORT WAVELENGTHS
• COHERENT RADIATION
• SYMPOSIA

Subject Categories:

• Plasma Physics and Magnetohydrodynamics
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE