Target current - an appropriate parameter for characterizing the dynamics of laser-matter interaction

0535640 - FZÚ 2021 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Krása, Josef - Klír, D. - Řezáč, K. - Cikhardt, J. - Velyhan, Andriy - Pfeifer, Miroslav - Dostál, Jan - Krůs, Miroslav - Dudžák, Roman - Buryšková, Simona - Nassisi, V. - Delle Side, D.
Target current - an appropriate parameter for characterizing the dynamics of laser-matter interaction.
XXII International Symposium on High Power Laser Systems and Applications. Bellingham: SPIE, 2019 - (Di Lazzaro, P.), s. 1-6, č. článku 110420X. Proceedings of SPIE, 11042. ISBN 978-151062750-5. ISSN 0277-786X.
[International Symposium on High Power Laser Systems and Applications (HPLS and A) /22./. Frascati (IT), 09.10.2018-12.10.2018]
Grant CEP: GA MŠMT EF15_008/0000162
GRANT EU: European Commission(XE) 654148 - LASERLAB-EUROPE
Grant ostatní: ELI Beamlines(XE) CZ.02.1.01/0.0/0.0/15_008/0000162
Institucionální podpora: RVO:68378271
Klíčová slova: laser produced-plasma * return target current * phases of laser-produced plasma * plasma barrier
Obor OECD: Fluids and plasma physics (including surface physics)

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.
Trvalý link: http://hdl.handle.net/11104/0313604