Transition from isentropic to isothermal expansion in laser produced plasmas
Open Access
- 1 June 1980
- journal article
- Published by IOP Publishing in Plasma Physics
- Vol. 22 (6) , 617-626
- https://doi.org/10.1088/0032-1028/22/6/010
Abstract
The transition that the expansion flow of laser-produced plasmas experiences when one moves from long, low intensity pulses (temperature vanishing at the isentropic plasma-vacuum front, lying at finite distance) to short, intense ones (non-zero, uniform temperature at the plasma-vacuum front, lying at infinity) is studied. For planar geometry and large ion number Zi the transition occurs for d phi /dt approximately=0.14(27/8)k72/Zi32/nc2/mi32/K; phi , nc, mi, and K are laser intensity, critical density, ion mass, and Spitzer's heat conduction coefficient (1962). This result remains valid for finite Zi, though the numerical factor in d phi dt is different. Shorter wavelength lasers and higher Zi plasmas allow faster rising pulses below transition.Keywords
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