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Optimization of parameters of a copper plasma jet produced at the plasma focus device

Published online by Cambridge University Press:  24 August 2017

A. Kasperczuk ,
M. Paduch ,
K. Tomaszewski ,
R. Miklaszewski ,
K. Jach ,
R. Swierczynski ,
W. Stepniewski ,
E. Zielinska  and
A. Szymaszek
A. Kasperczuk
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
M. Paduch
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
K. Tomaszewski
Affiliation:
ACS Laboratory, ACS Ltd., Warsaw, Poland
R. Miklaszewski
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
K. Jach
Affiliation:
Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
R. Swierczynski
Affiliation:
Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
W. Stepniewski
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
E. Zielinska*
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
A. Szymaszek
Affiliation:
Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
*
Address correspondence and reprint requests to: E. Zielinska, Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland. E-mail: [email protected]
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Abstract

The paper is aimed at optimization of parameters of a copper plasma jet produced at the DPF-1000U device, in which the inner electrode face was conically shaped. Preliminary information was obtained by numerical simulations of the plasma jet creation for different copper cones with the use of the two-dimensional magneto-hydrodynamic code KAROL. The simulations suggested that the cone height in the range of 4–7 cm should ensure a good plasma jet quality. The experimental data delivered by means of a 16-frame laser interferometer and a four-frame X-ray pinhole camera fully confirmed this conclusion. In the paper, we demonstrate the results for a 5 cm height cone. The eroded Cu plasma, swept up by the deuterium plasma sheath, was accelerated axially and compressed to very small diameter (3 mm) with an electron density of 7 × 1018 cm−3. The Cu plasma jet achieved a velocity of 5 × 107 cm/s and reached in the period of about 230 ns a distance (length) of 7 cm. The above results prove a successful adaptation of the plasma focus device to the metallic plasma jet generator.

Keywords

Conically shaped inner electrode faceCopper plasma jet creationCu plasma jet parametersHydrodynamic codeMelting and evaporation of cone materialPlasma focus devicePlasma sheath collapse
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 4 , December 2017 , pp. 561 - 568
Copyright
Copyright © Cambridge University Press 2017 

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