Study of fast electron generation using multi beam of LFEX-class laser
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Authors
Hata, Masayasu
Sakagami, H.
Johzaki, Tomoyuki
Sentoku, Y.
Nagatomo, Hideo
Issue Date
2016
Type
Article
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Abstract
Fast Ignition Realization Experiment project phase-I (FIREX-I) is being performed at Institute of Laser Engineering, Osaka University. In this project, the four-beam bundled high-energy Petawatt laser (LFEX) is being operated. LFEX laser provides great multi-beam irradiation flexibility, with the possibility of arrange the pulses in temporal sequence, spatially separate them in distinct spots of focus them in a single spot. In this paper, we study the two-beam interference effects on high-intensity picosecond laser-plasma interaction (LPI) by two-dimensional relativistic Particle-In-Cell simulations. The interference causes surface perturbation, which enhances laser absorption and underdense plasma generation, increasing the accelerated electron number and their slope temperature. The laser-to-electron energy conversion efficiency for two-beam interference case is suitable for Fast Ignition (FI) compared to the single beam case, but the increment of fast electron divergence leads to lower energy coupling. To optimize the target design for FI, these interference effects should be taken into consideration.
Description
Citation
M Hata et al 2016 J. Phys.: Conf. Ser. 717 012037
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License
Creative Commons Attribution 3.0 Unported
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PubMed ID
ISSN
1742-6588