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Title: Formation of laser plasma channels in a stationary gas

Abstract

Plasma channels with nonuniformity of about {+-}3.5% have been produced by a 0.3 J, 100 ps laser pulses in a nonflowing gas, contained in a cylindrical chamber. The laser beam passed through the chamber along its axis via pinholes in the chamber walls. Plasma channels with an electron density in the range of 10{sup 18}-10{sup 19} cm{sup -3} were formed in pure He, N{sub 2}, Ar, and Xe. A uniform channel forms in an optimal pressure range at a certain time delay, depending on the gas molecular weight. The interaction of the laser beam with the gas leaking out of the chamber through the pinholes was not significant. However, the formation of the ablative plasma on the walls of pinholes by the wings of radial profile of the laser beam plays an important role in the plasma channel formation and its uniformity. A low-current glow discharge initiated in the chamber improves the uniformity of the plasma channel slightly, while a high-current arc discharge leads to overdense plasma near the front pinhole and further refraction of the laser beam. These results indicate the potential for using nonflowing gas targets to create uniform plasma channels.

Authors:
; ; ; ;  [1];  [2];  [3];  [3]
  1. Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540 (United States)
  2. (TRINITI), Troitsk 142190 (Russian Federation)
  3. (United States)
Publication Date:
OSTI Identifier:
20782761
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 4; Other Information: DOI: 10.1063/1.2195383; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; ARGON; CYLINDRICAL CONFIGURATION; ELECTRIC ARCS; ELECTRON DENSITY; GLOW DISCHARGES; HELIUM; LASER-PRODUCED PLASMA; LASERS; LIGHT TRANSMISSION; NITROGEN; PLASMA DENSITY; PLASMA PRODUCTION; PULSES; TIME DELAY; WALL EFFECTS; XENON

Citation Formats

Dunaevsky, A., Goltsov, A., Greenberg, J., Valeo, E., Fisch, N.J., Troitsk Institute of Innovative and Thermonuclear Research, School of Engineering and Applied Science, Department of MAE, Princeton University, Princeton, New Jersey 08544, and Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543. Formation of laser plasma channels in a stationary gas. United States: N. p., 2006. Web. doi:10.1063/1.2195383.
Dunaevsky, A., Goltsov, A., Greenberg, J., Valeo, E., Fisch, N.J., Troitsk Institute of Innovative and Thermonuclear Research, School of Engineering and Applied Science, Department of MAE, Princeton University, Princeton, New Jersey 08544, & Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543. Formation of laser plasma channels in a stationary gas. United States. doi:10.1063/1.2195383.
Dunaevsky, A., Goltsov, A., Greenberg, J., Valeo, E., Fisch, N.J., Troitsk Institute of Innovative and Thermonuclear Research, School of Engineering and Applied Science, Department of MAE, Princeton University, Princeton, New Jersey 08544, and Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543. Sat . "Formation of laser plasma channels in a stationary gas". United States. doi:10.1063/1.2195383.
@article{osti_20782761,
title = {Formation of laser plasma channels in a stationary gas},
author = {Dunaevsky, A. and Goltsov, A. and Greenberg, J. and Valeo, E. and Fisch, N.J. and Troitsk Institute of Innovative and Thermonuclear Research and School of Engineering and Applied Science, Department of MAE, Princeton University, Princeton, New Jersey 08544 and Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543},
abstractNote = {Plasma channels with nonuniformity of about {+-}3.5% have been produced by a 0.3 J, 100 ps laser pulses in a nonflowing gas, contained in a cylindrical chamber. The laser beam passed through the chamber along its axis via pinholes in the chamber walls. Plasma channels with an electron density in the range of 10{sup 18}-10{sup 19} cm{sup -3} were formed in pure He, N{sub 2}, Ar, and Xe. A uniform channel forms in an optimal pressure range at a certain time delay, depending on the gas molecular weight. The interaction of the laser beam with the gas leaking out of the chamber through the pinholes was not significant. However, the formation of the ablative plasma on the walls of pinholes by the wings of radial profile of the laser beam plays an important role in the plasma channel formation and its uniformity. A low-current glow discharge initiated in the chamber improves the uniformity of the plasma channel slightly, while a high-current arc discharge leads to overdense plasma near the front pinhole and further refraction of the laser beam. These results indicate the potential for using nonflowing gas targets to create uniform plasma channels.},
doi = {10.1063/1.2195383},
journal = {Physics of Plasmas},
number = 4,
volume = 13,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}