Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter

We have used the new technique of soft x-ray laser shadowgraphy in combination with traditional plasma emission spectroscopy and theoretical modeling to study the dynamics of a plasma column created by a discharge through a 380 μm diameter evacuated microcapillary. The transient microcapillary plasm...

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Detalles Bibliográficos
Autores principales:	Marconi, Mario Carlos, Moreno, Cesar Hugo
Publicado:	2000
Materias:	Carrier concentration Plasmas Hot plasmas Atomic physics
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1063651X_v62_n5B_p7209_Marconi http://hdl.handle.net/20.500.12110/paper_1063651X_v62_n5B_p7209_Marconi
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_1063651X_v62_n5B_p7209_Marconi
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spelling	paper:paper_1063651X_v62_n5B_p7209_Marconi2023-06-08T16:03:46Z Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter Marconi, Mario Carlos Moreno, Cesar Hugo Carrier concentration Plasmas Hot plasmas Atomic physics We have used the new technique of soft x-ray laser shadowgraphy in combination with traditional plasma emission spectroscopy and theoretical modeling to study the dynamics of a plasma column created by a discharge through a 380 μm diameter evacuated microcapillary. The transient microcapillary plasma was imaged with high-spatial and temporal resolution using a tabletop discharge pumped 46.9-nm laser backlighter. Model computations show that the sharp boundary observed between the absorbent and transparent regions of the shadowgrams is defined by the spatial distribution of weakly ionized ions that are strongly photoionized by the probe laser. The plasma was observed to rapidly evolve from an initially nonuniform distribution into a column with good azimuthal symmetry and minimum density on axis [computed electron density on axis ne =(1-3)×1019 cm-3]. This concave electron density profile constitutes a plasma waveguide for laser radiation. Heated solely by Joule dissipation from relatively small excitation currents (1.5 kA), this dense plasma reaches substantial electron temperatures of Te=15-20 eV as a result of the absence of significant hydrodynamic losses and reduced radiation losses caused by large spectral line opacities. The results illustrate the potential of tabletop soft x-ray lasers as a new plasma diagnostic tool. ©2000 The American Physical Society. Fil:Marconi, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Moreno, C.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1063651X_v62_n5B_p7209_Marconi http://hdl.handle.net/20.500.12110/paper_1063651X_v62_n5B_p7209_Marconi
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Carrier concentration Plasmas Hot plasmas Atomic physics
spellingShingle	Carrier concentration Plasmas Hot plasmas Atomic physics Marconi, Mario Carlos Moreno, Cesar Hugo Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
topic_facet	Carrier concentration Plasmas Hot plasmas Atomic physics
description	We have used the new technique of soft x-ray laser shadowgraphy in combination with traditional plasma emission spectroscopy and theoretical modeling to study the dynamics of a plasma column created by a discharge through a 380 μm diameter evacuated microcapillary. The transient microcapillary plasma was imaged with high-spatial and temporal resolution using a tabletop discharge pumped 46.9-nm laser backlighter. Model computations show that the sharp boundary observed between the absorbent and transparent regions of the shadowgrams is defined by the spatial distribution of weakly ionized ions that are strongly photoionized by the probe laser. The plasma was observed to rapidly evolve from an initially nonuniform distribution into a column with good azimuthal symmetry and minimum density on axis [computed electron density on axis ne =(1-3)×1019 cm-3]. This concave electron density profile constitutes a plasma waveguide for laser radiation. Heated solely by Joule dissipation from relatively small excitation currents (1.5 kA), this dense plasma reaches substantial electron temperatures of Te=15-20 eV as a result of the absence of significant hydrodynamic losses and reduced radiation losses caused by large spectral line opacities. The results illustrate the potential of tabletop soft x-ray lasers as a new plasma diagnostic tool. ©2000 The American Physical Society.
author	Marconi, Mario Carlos Moreno, Cesar Hugo
author_facet	Marconi, Mario Carlos Moreno, Cesar Hugo
author_sort	Marconi, Mario Carlos
title	Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
title_short	Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
title_full	Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
title_fullStr	Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
title_full_unstemmed	Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
title_sort	dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter
publishDate	2000
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1063651X_v62_n5B_p7209_Marconi http://hdl.handle.net/20.500.12110/paper_1063651X_v62_n5B_p7209_Marconi
work_keys_str_mv	AT marconimariocarlos dynamicsofamicrocapillarydischargeplasmausingasoftxraylaserbacklighter AT morenocesarhugo dynamicsofamicrocapillarydischargeplasmausingasoftxraylaserbacklighter
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Dynamics of a microcapillary discharge plasma using a soft x-ray laser backlighter

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