Generation of secondary particles from subnanosecond laser iradiation of targets at intensities of 10.sup.16./sup. W cm.sup.-2./sup..

0422895 - FZÚ 2014 RIV US eng J - Journal Article
Krása, Josef - Margarone, Daniele - Klír, Daniel - Velyhan, Andriy - Picciotto, A. - Krouský, Eduard - Jungwirth, Karel - Skála, Jiří - Pfeifer, Miroslav - Ullschmied, Jiří - Kravárik, J. - Řezáč, K. - Kubeš, J. - Parys, P. - Ryc, L.
Generation of secondary particles from subnanosecond laser iradiation of targets at intensities of 10¹⁶ W cm^-2.
IEEE Transactions on Plasma Science. Roč. 41, č. 10 (2013), s. 2819-2824. ISSN 0093-3813. E-ISSN 1939-9375.
[4th Euro-Asian Pulsed Power Conference (EAPPC) / 19th International Conference on High-Power Particle Beams (BEAMS). Karlsruhe, 30.09.2012-04.10.2012]
R&D Projects: GA MŠMT ED1.1.00/02.0061; GA MŠMT EE2.3.20.0279; GA ČR GAP205/12/0454
Grant - others:ELI Beamlines(XE) CZ.1.05/1.1.00/02.0061; OPVK 3 Laser Zdroj(XE) CZ.1.07/2.3.00/20.0279
Program: EE
Institutional support: RVO:68378271 ; RVO:61389021
Keywords : deuterium * ion bursts * laser-produced plasma * multiMeV protons * yield of fusion neutrons
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 0.950, year: 2013

Emission of several tens of mA/cm2 currents carried by MeV-protons is reported for plasmas produced by a beam of the 3-TW kJ-class Prague Asterix Laser System (PALS) focused onto foil targets of various thicknesses. The maximum proton energy of 4.2 MeV is observed at a modest irradiance (Iλ2 ~ 2e16 W cm-2μm2). According to the maximum ion energy scaling EM ~ (Iλ2)^ 0.4 found for picosecond lasers such a value should be reached at Iλ2 ~ 3e18 W cm-2 μm2. Enhancement of the maximum proton energy can be explained by nonlinear interaction of the PALS laser beam with the generated plasma. Nonlinear effects also result in enhancement in the yield of fusion neutrons from CD2 plasma. The obtained yield of 4e5 DD-neutrons per laser energy is comparable to those obtained by the use of ps- and fs-lasers irradiating targets with Iλ2 ~ 1e19 W cm-2 μm2.
Permanent Link: http://hdl.handle.net/11104/0228989