Nonlocal transport in hot plasma. Part II
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Nonlocal Transport in Hot Plasma. Part II A. V. Brantov and V. Yu. Bychenkov Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia Dukhov AllRussia Research Institute of Automatics, Sushchevskaya ul. 22, Moscow, 127055 Russia email: [email protected], [email protected] Received October 31, 2013; in final form, December 18, 2013
Abstract—The second part of the review, the first part of which was published earlier in Plasma Phys. Rep. 39, 698 (2013), is presented. A wide range of electromagnetic phenomena in laser plasma under nonlocal transport conditions requiring kinetic consideration are described. Among them, there are nonlocal transport in magnetized plasma, absorption and penetration of laser radiation in dense plasma, nonlocal effects related to inversebremsstrahlung heating and ponderomotive interaction, plasma fluctuations caused by a speckled laser beam, propagation of laser radiation and parametric instabilities in lowdensity plasma, and ionacous tic instability of the return current. Many results are applicable for arbitrary relations between the character istic spatial and time scales of the plasma parameters, which substantially advances the concept of laser– plasma interaction in hot plasma as compared to the conventional theories of collisionless and strongly col lisional plasmas. DOI: 10.1134/S1063780X14060026
1. INTRODUCTION Here, we present the second part of the review on the theory of nonlocal transport in hot plasma. In the first part [1], we described the main ideas of nonlocal transport models and plasma permittivity for arbitrary relations between the spatial and temporal scales of plasma perturbations and those of particle collisions. The second part of the review is dedicated to electro dynamic phenomena in plasma under conditions of nonlocal transport. Here, we consider important applications of the nonlocal theory and demonstrate how the nonlocal character of particle transport in plasma modifies the concepts of many wellknown phenomena involving selfconsistent electromagnetic and electrostatic fields in plasma, as well as external fields, such as laser and quasistatic magnetic fields. As was noted in the first part of this review [1], the strong dependence of the free path length of particles on their kinetic energy limits the applicability of the standard local theory by very gently sloping plasma temperature profiles. In order for the Chapman– Enskog method [2] widely used to derive transport equations to be applicable [3], the characteristic scale lengths L of the temperature profile must be at least several hundred times larger than the mean free path. To describe plasma with larger gradients typical of laser and, in some cases, magnetoactive laboratory [4] and astrophysical plasmas [5], kinetic consideration is required. We note that the kinetic approach has already demonstrated a change in the character of transport in magnetoactive plasma [6] as compared to the classical results [2]. The further deve
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