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Target current: an appropriate parameter for characterizing the dynamics of laser-matter interaction
Author(s): Josef Krása; Daniel KlÍr; Karel Řezáč; Jakub Cikhardt; Andriy Velyhan; Miroslav Pfeifer; Jan Dostál; Miroslav Krůs; Roman Dudžák; Simona Buryšková; Vincenso Nassisi; Domenico Delle Side
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Paper Abstract

A resistive target probes were employed to obtain unique characteristics of the dynamic of the laser-matter interaction through the observation of a return current neutralizing the positive target charge caused by electrons definitely leaving the plasma. Experimental observations show that three phases of the laser-produced plasma are well recognized, i.e. the plasma ignition phase, active plasma phase, and afterglow phase already for the lowest laser intensity at the focal point of 108 Wcm-2 . Then, at higher intensities the first two phases strongly dominate and the target current reaches a value of 10 kA. A throughput of plasma barrier for the fastest electrons leaving the plasma is defined, and its value is experimentally estimated. We also present key experiments proving that the duration of the electrical charge on the target is much longer than the duration of the laser-plasma interaction for the entire intensity range.

Paper Details

Date Published: 3 January 2019
PDF: 6 pages
Proc. SPIE 11042, XXII International Symposium on High Power Laser Systems and Applications, 110420X (3 January 2019); doi: 10.1117/12.2520177
Show Author Affiliations
Josef Krása, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Daniel KlÍr, Czech Technical Univ. in Prague (Czech Republic)
Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Karel Řezáč, Czech Technical Univ. in Prague (Czech Republic)
Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Jakub Cikhardt, Czech Technical Univ. in Prague (Czech Republic)
Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Andriy Velyhan, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Miroslav Pfeifer, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Jan Dostál, Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Miroslav Krůs, Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Roman Dudžák, Institute of Plasma Physics of the CAS, v.v.i. (Czech Republic)
Simona Buryšková, Institute of Physics of the CAS, v.v.i. (Czech Republic)
Czech Technical Univ. in Prague (Czech Republic)
Vincenso Nassisi, Univ. del Salento (Italy)
Instituto Nazionale di Fisica Nucleare (Italy)
Domenico Delle Side, Univ. del Salento (Italy)
Instituto Nazionale di Fisica Nucleare (Czech Republic)


Published in SPIE Proceedings Vol. 11042:
XXII International Symposium on High Power Laser Systems and Applications
Paolo Di Lazzaro, Editor(s)

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