Self-similar motion of laser half-space plasmas. II. Thermal waves and intermediate regimes

Sanmartín Losada, Juan Ramón and Barrero, A. (1978). Self-similar motion of laser half-space plasmas. II. Thermal waves and intermediate regimes. "Physics of fluids", v. 21 ; pp. 1967-1971. ISSN 0031-9171.

Description

Title: Self-similar motion of laser half-space plasmas. II. Thermal waves and intermediate regimes
Author/s:
  • Sanmartín Losada, Juan Ramón
  • Barrero, A.
Item Type: Article
Título de Revista/Publicación: Physics of fluids
Date: 1978
ISSN: 0031-9171
Volume: 21
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a la Ingeniería Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The one-dimensional self-similar motion of an initially cold, half-space plasma of electron density n,produced by the (anomalous) absorption of a laser pulse of irradiation <p ^ <p0 f /T (0< t < T) at the critical density nc, is considered; the analysis, which allows for electron heat conduction and ion-electron energy exchange, involves three dimensionless numbers: e = nc/n0 assumed small, Z, (ion charge number), and a parameter a<x(«0 2r/<j)0)2'3. For a < l , a weak discontinuity develops, separating a thermal wave (where convection is negligible) moving into the undisturbed plasma, from a much thinner isothermal flow expanding into the vacuum. For l<a<e~4'3, there is an isentropic compression flow between a shock, bounding the undisturbed plasma, and a very thin transition layer bounding an expansion flow, much larger in extent than the compression region. In both regimes, the critical plane lies far in the expansion tail. The results break down when the density is so small that the plasma becomes collisionless. The analysis is also invalid for a too small. Using results previously found for a>€~4'3, a qualitative discussion of how plasma behavior changes with a, is given.

More information

Item ID: 21385
DC Identifier: http://oa.upm.es/21385/
OAI Identifier: oai:oa.upm.es:21385
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 19 Oct 2013 05:04
Last Modified: 26 Oct 2016 07:39
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