Dynamics of the implosion of the dense plasma focus play an essential role in converting electrical energy into the kinetic energy of the current sheath and subsequent production of accelerated electrons, ions, hard X-ray, and neutron emission. This paper presents the analysis of the implosion parameters, such as the implosion velocity and imploding mass, coupled with electrical parameters observed on the PF-1000 facility with a modified electrode system. The first two parameters are based on the 16-frame Mach–Zehnder interferometer, which provides the spatial distribution of electron density in a time sequence. Measurement of the total current, current derivative, and voltage enables us to evaluate the total inductance and kinetic energy driven by the capacitor bank. Then comparing the inductances and kinetic energies evaluated from the interferograms and electrical waveforms can provide more precise information on the current flowing in the imploding sheath. We present a possible way to deal with the fact that only part of the total current flows through the imploding layer. With the supposition that the rest of the current flows close to the insulator, we conclude that roughly 70% of the total current flows through the pinch, which is in good agreement with an input parameter of the Lee model, for example.
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September 2022
Research Article|
September 23 2022
Dynamics of implosion phase of modified plasma focus studied via laser interferometry and electrical measurements
J. Malir
;
J. Malir
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
a)Author to whom correspondence should be addressed: [email protected]
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D. Klir
;
D. Klir
(Conceptualization, Methodology, Supervision, Validation, Writing – review & editing)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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J. Cikhardt
;
J. Cikhardt
(Supervision, Validation, Writing – review & editing)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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J. Kravarik
;
J. Kravarik
(Data curation)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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P. Kubes
;
P. Kubes
(Data curation)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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V. Munzar
;
V. Munzar
(Software, Validation)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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J. Novotny
;
J. Novotny
(Data curation)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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K. Rezac
;
K. Rezac
(Data curation)
1
Faculty of Electrical Engineering, Czech Technical University in Prague
, 16627 Prague 6, Czech Republic
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M. Paduch
M. Paduch
(Data curation)
2
Institute of Plasma Physics and Laser Microfusion (IPPLM)
, 23 Hery Street, 01-497 Warsaw, Poland
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a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 29, 092706 (2022)
Article history
Received:
May 05 2022
Accepted:
August 28 2022
Citation
J. Malir, D. Klir, J. Cikhardt, J. Kravarik, P. Kubes, V. Munzar, J. Novotny, K. Rezac, M. Paduch; Dynamics of implosion phase of modified plasma focus studied via laser interferometry and electrical measurements. Phys. Plasmas 1 September 2022; 29 (9): 092706. https://doi.org/10.1063/5.0098124
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