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Non-scanning systems for far-infrared radiation detection from laser-induced plasmas

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High Power laser Science and Engineering 2015年第2期3卷 1-5页

作者： Chun Li Guo-Qian Liao Yu-Tong Li Beijing National Laboratory of Condensed Matter Physics Institute of Physics CAS IFSA Collaborative Innovation Center Shanghai Jiao Tong University

With the development of ultraintense terawatt(TW) and petawatt(PW) laser systems, powerful terahertz(THz) radiation from laser–plasma interactions has been reported. plasma-based THz systems, which are usually operated at extremely low repetition rates, call for single-shot diagnostics. In this paper, various state-of-the-art single-shot detection methods are introduced or designed for measurements and applications involved in high-power plasma-based THz sciences.

关键词： laser–plasma interaction single-shot detection ter

Theory of light sail acceleration by intense lasers:an overview

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High Power laser Science and Engineering 2014年第2期2卷 1-6页

作者： Andrea Macchi National Institute of Optics National Research Council (CNR/INO) Research Unit ‘Adriano Gozzini’Department of Physics ‘Enrico Fermi’ University of Pisa largo Bruno Pontecorvo 3 I-56127 Pisa Italy

A short overview of the theory of acceleration of thin foils driven by the radiation pressure of superintense lasers is presented. A simple criterion for radiation pressure dominance at intensities around 5×1020W cm-... 详细信息

关键词： light sail radiation pressure laser–plasma acceleration of electrons and ions laser-driven acceleration

Nonlinear wake amplification by an active medium in a cylindrical waveguide using a modulated trigger bunch

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High Power laser Science and Engineering 2014年第3期2卷 91-101页

作者： Zeev Toroker Miron Voin Levi Schchter Department of Electrical Engineering TechnionIsrael Institute of TechnologyHaifa 32000Israel

Cerenkov wake amplification can be used as an accelerating scheme,in which a trigger bunch of electrons propagating inside a cylindrical waveguide filled with an active medium generates an initial wake field.Due to the multiple reflections inside the waveguide,the wake may be amplified significantly more strongly than when propagating in a boundless medium.Sufficiently far away from the trigger bunch the wake,which travels with the same phase velocity as the bunch,reaches saturation and it can accelerate a second bunch of electrons trailing behind.For a CO2 gas mixture our numerical and analytical calculations indicate that a short saturation length and a high gradient can be achieved with a large waveguide radius filled with a high density of excited atoms and a trigger bunch that travels at a velocity slightly above the Cerenkov velocity.To obtain a stable level of saturated wake that will be suitable for particle acceleration,it is crucial to satisfy the single-mode resonance condition,which requires high accuracy in the waveguide radius and the ratio between the electron phase velocity and the Cerenkov velocity.For single-mode propagation our model indicates that it is feasible to obtain gradients as high as GV m-1 in a waveguide length of cm.

关键词： laser–plasma interaction novel optical material and device

Experimental observation of backscattered light based on different coherence between incident laser beams

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High Power laser Science and Engineering 2013年第2期1卷 94-97页

作者： Xiangfu Meng Chen Wang Honghai An Guo Jia Huazhen Zhou Sizu Fu Shanghai Institute of laser plasma

Recent experimental results on NIF revealed a much higher stimulated Brillouin scattering(SBS)and stimulated Raman scattering(SRS)backscatter than expected;one possible reason was due to the coherence between incident laser beams.In our research,two laser beams(~1 ns,~250 J,527 nm in each one)with different coherent degrees between them from the SG-II facility were employed to irradiate an Au plate target;the backscatter of SBS and SRS in the range of the given solid angle had been measured.The results showed that it could change dramatically corresponding to the difference of the coherent degree between the two laser beams,and there was usually more intense backscatter the higher the coherent degree between the incident beams.

关键词： backscatter coherence laser–plasma interaction

Temperature dependence of parametric instabilities in the context of the shock-ignition approach to inertial confinement fusion

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High Power laser Science and Engineering 2015年第1期3卷 51-63页

作者： S.Weber C.Riconda Institute of Physics of the ASCR ELI-Beamlines LULI Sorbonne Universités - Université Pierre et Marie Curie - Ecole Polytechnique - CNRS - CEA

The role of the coronal electron plasma temperature for shock-ignition conditions is analysed with respect to the dominant parametric processes: stimulated Brillouin scattering, stimulated Raman scattering, two-plasmon decay(TPD), Langmuir decay instability(LDI) and cavitation. TPD instability and cavitation are sensitive to the electron temperature. At the same time the reflectivity and high-energy electron production are strongly affected. For low plasma temperatures the LDI plays a dominant role in the TPD saturation. An understanding of laser–plasma interaction in the context of shock ignition is an important issue due to the localization of energy deposition by collective effects and hot electron production.This in turn can have consequences for the compression phase and the resulting gain factor of the implosion phase.

关键词： inertial confinement fusion shock ignition laser–plasma interaction parametric instabilities

Controllability of intense-laser ion acceleration

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High Power laser Science and Engineering 2014年第1期2卷 18-28页

作者： Shigeo Kawata Toshihiro Nagashima Masahiro Takano Takeshi Izumiyama Daiki Kamiyama Daisuke Barada Qing Kong Yan Jun Gu Ping Xiao Wang Yan Yun Ma Wei Ming Wang Wu Zhang Jiang Xie Huiran Zhang Dongbo Dai Department of Advanced Interdisciplinary Sciences Utsunomiya University CORE (Center for Optical Research and Education) Utsunomiya University School of Computer Engineering and Sciences Shanghai University Institute of Modern Physics Fudan University Department of Physics National University of Defense Technology Institute of Physics Chinese Academy of Sciences

An ion beam has the unique feature of being able to deposit its main energy inside a human body to kill cancer cells or inside material. However, conventional ion accelerators tend to be huge in size and cost. In this paper, a future intenselaser ion accelerator is discussed to make the laser-based ion accelerator compact and controllable. The issues in the laser ion accelerator include the energy efficiency from the laser to the ions, the ion beam collimation, the ion energy spectrum control, the ion beam bunching, and the ion particle energy control. In the study, each component is designed to control the ion beam quality by particle simulations. The energy efficiency from the laser to ions is improved by using a solid target with a fine sub-wavelength structure or a near-critical-density gas plasma. The ion beam collimation is performed by holes behind the solid target or a multi-layered solid target. The control of the ion energy spectrum and the ion particle energy, and the ion beam bunching are successfully realized by a multi-stage laser–target interaction.

关键词： Intense short-pulse laser laser ion acceleration laser ion cancer therapy laser–plasma interaction