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Double layer (DL) formation in laser-produced plasma

Published online by Cambridge University Press:  09 March 2009

Shalom Eliezer and
Ariold Ludmirsky
Shalom Eliezer
Affiliation:
Soreq Nuclear Research Center, Yavne 70600, Israel
Ariold Ludmirsky
Affiliation:
Soreq Nuclear Research Center, Yavne 70600, Israel
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Abstract

It is shown that appropriate conditions for DL formation may be created in laser produced plasma. In particular, a ‘feedback’ mechanism is suggested:

Wave instabilities → absorption of laser energy → inward heat flux → DL formation → heat flux inhibition → wave instabilities

Plasma-target potentials and plasma-currents, produced by Nd. laser intensities (IL) between 1012 to 1015 W/cm2, were measured in situ. These measurements seem to be the first direct evidence of DLs in laser produced plasma. Electric fields of EDL ∼ 5 × 105 to 5 × 106 Volts/cm and widths of 10 to 100 Debye lengths are estimated for the DL.

Scaling laws are derived for the measured extremum potentials (V) and currents (I): . Two different slopes were obtained experimentally, one slope equal to α = β = 1·0 for IL < 1014 W/cm2 and another of α = β = 0·4 for IL > 1014 W/cm2. These data are explained for temperature scaling law for the low irradiance and for the high irradiance. While the first scaling law is consistent with inverse bremsstrahlung absorption, the second scaling necessitates other absorption processes. Potential and current probes are suggested as useful devices in detecting wave plasma instabilities.

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Type
Research Article
Information
Laser and Particle Beams , Volume 1 , Issue 3 , August 1983, pp. 251 - 269
Copyright
Copyright © Cambridge University Press 1983

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