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Influence of an external additional magnetic field on the formation of a plasma column in a dense plasma focus

Authors :
P. Kubes
V. Munzar
D. Zaloga
Ewa Zielinska
Marek J. Sadowski
Jozef Kravarik
Daniel Klir
B. Cikhardtova
Roch Kwiatkowski
K. Tomaszewski
Marian Paduch
Elzbieta Skladnik-Sadowska
A. Szymaszek
K. Rezac
Jakub Cikhardt
Source :
Physics of Plasmas. 26:102701
Publication Year :
2019
Publisher :
AIP Publishing, 2019.

Abstract

This paper concerns the evolution of internal structures and the neutron production in plasma-focus discharges performed in the presence of a permanent magnet (placed inside the anode front) and within a residual magnetic field (after the removal of this magnet). The initial magnetic field generated by this magnet prevented: (i) the effective compression of a dense pinch column, (ii) the formation of plasma organized structures, and (iii) the evolution of plasma instabilities. The experimental results have shown an increase in the initial magnetic field due to a magnetic dynamo effect in the presence of the permanent magnet, as well as in a series of shots performed after its removal. It was observed that the appearance of plasmoidal structures is necessary for the emission of fusion neutrons. A characteristic quasicylindrical plasma layer of the radius corresponding to the plasma lobule tops, which might be identified with a ring region of the acceleration of fast deuterons, was also observed.

Details

ISSN :
10897674 and 1070664X
Volume :
26
Database :
OpenAIRE
Journal :
Physics of Plasmas
Accession number :
edsair.doi...........7efa94c467fadee1c41da4617ea78df4
Full Text :
https://doi.org/10.1063/1.5094568