Sushil K. Singh, Michal Krupka, Josef Krasa, Valeria Istokskaia, Jan Dostal, Roman Dudzak, Tadeusz Pisarczyk, Jakub Cikhardt, Shubham Agarwal, Daniel Klir, Karel Rezac, Lorenzo Giuffrida, Tomasz Chodukowski, Zofia Rusiniak, Tomas Burian, Daniele Margarone, Miroslav Krus, Libor Juha
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The hot electron temperatures were observed in range from 30 to 80 keV for laser intensities between <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" mimetype=\"image\" xlink:href=\"S0263034623000022_inline1.png\" /> <jats:tex-math>${\\sim}10^{15}$</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" mimetype=\"image\" xlink:href=\"S0263034623000022_inline2.png\" /> <jats:tex-math>$3 \\times 10^{16}\\ \\mathrm{W\\,cm^{-2}}$</jats:tex-math> </jats:alternatives> </jats:inline-formula>. The measured energy distribution and electron temperature were compared with published results and known scaling laws at higher laser intensities. For foil targets of different materials, the temperature and flux of hot electrons were scaled with target thickness in the range of 1–100 <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" mimetype=\"image\" xlink:href=\"S0263034623000022_inline3.png\" /> <jats:tex-math>$\\unicode{x03BC}\\mathrm{m}$</jats:tex-math> </jats:alternatives> </jats:inline-formula> from low Z to high Z materials where Z is the atomic number. The profile of conversion efficiency from laser energy to hot electrons is discussed in the energy range from 100 to 600 J. 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引用次数: 0
摘要
聚焦的高功率激光束与固体靶相互作用时,等离子体中的非线性效应会导致带电粒子加速。在本实验中,亚纳秒级和千焦耳级激光脉冲与薄金属箔目标(铜、钽、钛、锡、铅)的相互作用产生了热电子。电子的能量分布函数是通过角分辨多通道电子能谱仪测量的。在激光强度介于 ${\sim}10^{15}$ 和 $3 \times 10^{16}\mathrm\{W,cm^{-2}}$ 之间时,观察到热电子温度在 30 至 80 keV 之间。测得的能量分布和电子温度与已公布的结果以及已知的更高激光强度下的缩放规律进行了比较。对于不同材料的箔靶,热电子的温度和通量与靶厚度成比例,从低 Z 到高 Z 材料的范围为 1-100 $unicode{x03BC}\mathrm{m}$,其中 Z 是原子序数。对于给定的激光和靶参数,还详细描述了转换效率的非线性行为和相关物理特性。
Hot electron emission characteristics from thin metal foil targets irradiated by terawatt laser
The interaction of focused high power laser beam with solid targets leads to acceleration of charged particles among other by non-linear effects in the plasma. In this experiment, the hot electrons are characterized from the interaction of sub-nanosecond and kilo-joule class laser pulse with thin metal foil targets (Cu, Ta, Ti, Sn, Pb). The energy distribution functions of electrons were measured by angularly resolved multichannel electron spectrometer. The hot electron temperatures were observed in range from 30 to 80 keV for laser intensities between ${\sim}10^{15}$ and $3 \times 10^{16}\ \mathrm{W\,cm^{-2}}$. The measured energy distribution and electron temperature were compared with published results and known scaling laws at higher laser intensities. For foil targets of different materials, the temperature and flux of hot electrons were scaled with target thickness in the range of 1–100 $\unicode{x03BC}\mathrm{m}$ from low Z to high Z materials where Z is the atomic number. The profile of conversion efficiency from laser energy to hot electrons is discussed in the energy range from 100 to 600 J. For the given laser and target parameters, the nonlinear behaviour of conversion efficiency and relevant physics are also described in detail.
期刊介绍:
Laser and Particle Beams is an international journal which deals with basic physics issues of intense laser and particle beams, and the interaction of these beams with matter. Research on pulse power technology associated with beam generation is also of strong interest. Subjects covered include the physics of high energy densities; non-LTE phenomena; hot dense matter and related atomic, plasma and hydrodynamic physics and astrophysics; intense sources of coherent radiation; high current particle accelerators; beam-wave interaction; and pulsed power technology.