Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

0422829 - FZÚ 2014 RIV US eng J - Journal Article
Krása, Josef - Klír, D. - Velyhan, Andriy - Margarone, Daniele - Krouský, Eduard - Jungwirth, Karel - Skála, Jiří - Pfeifer, Miroslav - Kravárik, J. - Kubeš, P. - Řezáč, K. - Ullschmied, Jiří
Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments.
Laser and Particle Beams. Roč. 31, č. 3 (2013), s. 395-401. ISSN 0263-0346. E-ISSN 1469-803X
R&D Projects: GA MŠMT EE2.3.20.0279; GA ČR GAP205/12/0454; GA MŠMT LM2010014
Grant - others:OPVK 3 Laser Zdroj(XE) CZ.1.07/2.3.00/20.0279
Program: EE
Institutional support: RVO:68378271 ; RVO:61389021
Keywords : laser-plasma interactions * neutron yield scaling * bursts in ion emission
Subject RIV: BH - Optics, Masers, Lasers; BL - Plasma and Gas Discharge Physics (UFP-V)
Impact factor: 1.701, year: 2013

A massive deuterated polyethylene target was exposed to laser intensities of about 3 × 1016 W/cm2 employing the 3-TW Prague Asterix Laser System (PALS). We achieved a yield of 2 × 108 neutrons per laser shot. Average time-of-flight signals of scintillation detectors operated in current mode reveal broad energy spectra of fusion neutrons with dominating energy of about 2.45 MeV. The energy dependence of the neutron yield shows a consistency in results of nanosecond, picosecond and sub-picosecond experiments. Here we also show that ions emitted in the backward direction from the front target surface have a multi-peak energy spectrum, which is caused by burst emission mechanisms.
Permanent Link: http://hdl.handle.net/11104/0228963