Nonlinear collisional absorption in laser‐driven plasmas
作者： C. D. Decker , W. B. Mori , J. M. Dawson , T. Katsouleas
DOI: 10.1063/1.870874
关键词: Absorption (electromagnetic radiation) 、 Ionization 、 Debye length 、 Electromagnetic pump 、 Amplitude 、 Atomic physics 、 Thermal velocity 、 Physics 、 Plasma 、 Collision frequency
摘要: The collisional heating rate of a fully ionized plasma driven by strong electromagnetic pump wave is re‐examined both analytically and with two‐dimensional particle‐in‐cell (PIC) simulations. high frequency conductivity model Dawson Oberman [J. C. Oberman, Phys. Fluids 5, 517(1962)] extended for the case in which quiver velocity vo=eE/mωo much larger than thermal vth its equivalence to results Silin [V. P. Silin, Sov. JETP 20, 1510 (1965)] shown. reduced two‐dimensions comparison PIC Excellent agreement between theory simulations vo/vth≤1 obtained. However, when vo/vth≫1 excursion amplitude xo=eE/mω2o Debye length λD, show enhancements collision from theory. A possible mechanism this enhancement provided.
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