Flame Propagation and Overdense Heating in a Laser Created Plasma
A one‐dimensional continuum hydrodynamic theory is used to investigate the structure of the deflagration wave which occurs when a laser light beam impinges on a solid target. It is shown that the nonlinear electron heat conduction is responsible for most of the structure; a region of density higher...
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Veröffentlicht in: | Phys. Fluids 14: No. 11, 2341-54(Nov 1971) 2341-54(Nov 1971), 1971-11, Vol.14 (11), p.2341-2354 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A one‐dimensional continuum hydrodynamic theory is used to investigate the structure of the deflagration wave which occurs when a laser light beam impinges on a solid target. It is shown that the nonlinear electron heat conduction is responsible for most of the structure; a region of density higher than the cutoff is strongly heated. Density and temperature profiles are calculated. An approximate solution for the thickness
x
of the overdense layer gives
x =
4
5
[(γ−1) / (5γ−1)](m/k)
3/2
A(T
c
2
/ρ
c
)
(
m
is the ion mass,
k
is the Boltzmann constant,
A T
5/2
is the nonlinear electron heat conduction coefficient,
T
c
is the temperature of the plasma at cutoff density
ρ
c
. The average density in the layer is about twice the cutoff density. The effects of viscosity and (since electrons are heated by the laser light) of ion‐electron relaxation are evaluated. |
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ISSN: | 0031-9171 2163-4998 |
DOI: | 10.1063/1.1693339 |