Short-wavelength experiments on laser pulse interaction with extended pre-plasma at the PALS-installation

Tadeusz Pisarczyk , Sergey Yu Guskov , Oliver Renner , Roman Dudzak , J. Dostal , Nikolay N Demchenko , Michal Šmíd , Tomasz Chodukowski , Zofia Kalinowska , Marcin Rosinski , Piotr Parys , Jan Badziak , Dimitri Batani , Stefan Borodziuk , Leonida A. Gizzi , Eduard Krouský , Y. Maheut , Gabriele Cristoforetti , Luca Antonelli , Petra Koester , Federica Baffigi , Jiri Ullschmied , Jan Hrebicek , T. Medrik , Miroslav Pfeifer , Jiri Skala , Paweł Pisarczyk

Abstract

The paper is a continuation of research carried out at Prague Asterix Laser System (PALS) related to the shock ignition (SI) approach in inertial fusion, which was carried out with use of 1ω main laser beam as the main beam generating a shock wave. Two-layer targets were used, consisting of Cu massive planar target coated with a thin polyethylene layer, which, in the case of two-beam irradiation geometry, simulate conditions related to the SI scenario. The investigations presented in this paper are related to the use of 3ω to create ablation pressure for high-power shock wave generation. The interferometric studies of the ablative plasma expansion, complemented by measurements of crater volumes and Kα emission, clearly demonstrate the effect of changing the incident laser intensity due to changing the focal radius on efficiency of laser energy transfer to a shock wave and fast electron emission. The efficiency of the energy transfer increases with the radius of the focused laser beam. The pre-plasma does not significantly change the character of this effect. However, it unambiguously results in the increasing temperature of fast electrons, the total energy of which remains very small (<0.1% of the laser energy). This study shows that the optimal radius from the point of view of 3ω radiation energy transfer to the shock wave is the maximal one used in these experiments and equal to 200 µm that corresponds to the minimal effect of two-dimensional (2D)-expansion. Such a result is typical for the ablation process determined by electron conductivity energy transfer under the conditions of one-dimensional or 2D matter expansion without any appreciable effect due to energy transfer by fast electrons. The 2D simulations based on application of the ALANT-HE code and an analytical model that includes generation and transport of hot electrons has been used to support of experimental data.
Author Tadeusz Pisarczyk
Tadeusz Pisarczyk,,
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, Sergey Yu Guskov
Sergey Yu Guskov,,
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, Oliver Renner
Oliver Renner,,
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, Roman Dudzak
Roman Dudzak,,
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, J. Dostal
J. Dostal,,
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, Nikolay N Demchenko
Nikolay N Demchenko,,
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, Michal Šmíd
Michal Šmíd,,
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, Tomasz Chodukowski
Tomasz Chodukowski,,
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, Zofia Kalinowska
Zofia Kalinowska,,
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, Marcin Rosinski
Marcin Rosinski,,
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et al.
Journal seriesLaser and Particle Beams, ISSN 0263-0346
Issue year2016
Vol34
No1
Pages94-108
Publication size in sheets0.7
Keywords in EnglishLaser-produced plasma; Shock iginition; Fast electrons; Energy transport; Femtosecond interferomerty
DOIDOI:10.1017/S0263034615000993
Languageen angielski
File
LPB-34, 94-108-(2016).pdf (file archived - login or check accessibility on faculty) LPB-34, 94-108-(2016).pdf 1.5 MB
Score (nominal)30
ScoreMinisterial score = 20.0, 27-03-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 27-03-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.42 (2) - 2016=1.244 (5)
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