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Title: Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity

Abstract

The dynamics of laser generated plasma plumes expanding within confining surfaces display a two-phase nature. Early phase enhancement due to hydrodynamic containment results in higher temperatures, densities, and average charges states in comparison to freely expanding plasma plumes. Later phase dynamics result in rapid decay of the plasma plume due to lossy plasma--surface interactions. This paper examines laser plasma generation and expansion within rectangular aluminium cavities biased to high voltages (V{sub bias} = {+-}9 kV). ''Hydro-electro-dynamic'' confinement of the laser plasma plumes and the expansion dynamics were studied via space and time resolved visible emission spectroscopy. The charged confining cavities displayed enhanced emission, higher electron densities (N{sub e}) and longer emission durations compared to those of an unbiased cavity. This behavior is attributed to the influence of the electric fields in the cavity on the charged particle dynamics within the cavity volume. The degree of enhancement depended strongly on the applied polarity.

Authors:
 [1];  [1];  [2]
  1. National Centre for Plasma Science and Technology, Dublin City University, Dublin 9 (Ireland)
  2. (Ireland)
Publication Date:
OSTI Identifier:
22036724
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 110; Journal Issue: 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; CHARGE STATES; CHARGED PARTICLES; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTROHYDRODYNAMICS; ELECTRON DENSITY; ELECTRON TEMPERATURE; EMISSION SPECTROSCOPY; ION TEMPERATURE; PLASMA; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA EXPANSION; SURFACES; WALL EFFECTS

Citation Formats

Yeates, P., Kennedy, E. T., and School of Physical Sciences, Dublin City University, Dublin 9. Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity. United States: N. p., 2011. Web. doi:10.1063/1.3638697.
Yeates, P., Kennedy, E. T., & School of Physical Sciences, Dublin City University, Dublin 9. Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity. United States. doi:10.1063/1.3638697.
Yeates, P., Kennedy, E. T., and School of Physical Sciences, Dublin City University, Dublin 9. Thu . "Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity". United States. doi:10.1063/1.3638697.
@article{osti_22036724,
title = {Diagnostics of laser plasma plume dynamics within an electrically biased confining cavity},
author = {Yeates, P. and Kennedy, E. T. and School of Physical Sciences, Dublin City University, Dublin 9},
abstractNote = {The dynamics of laser generated plasma plumes expanding within confining surfaces display a two-phase nature. Early phase enhancement due to hydrodynamic containment results in higher temperatures, densities, and average charges states in comparison to freely expanding plasma plumes. Later phase dynamics result in rapid decay of the plasma plume due to lossy plasma--surface interactions. This paper examines laser plasma generation and expansion within rectangular aluminium cavities biased to high voltages (V{sub bias} = {+-}9 kV). ''Hydro-electro-dynamic'' confinement of the laser plasma plumes and the expansion dynamics were studied via space and time resolved visible emission spectroscopy. The charged confining cavities displayed enhanced emission, higher electron densities (N{sub e}) and longer emission durations compared to those of an unbiased cavity. This behavior is attributed to the influence of the electric fields in the cavity on the charged particle dynamics within the cavity volume. The degree of enhancement depended strongly on the applied polarity.},
doi = {10.1063/1.3638697},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 6,
volume = 110,
place = {United States},
year = {2011},
month = {9}
}