TITLE

Effect of dynamical friction on nonlinear energetic particle modes

AUTHOR(S)
Lilley, M. K.; Breizman, B. N.; Sharapov, S. E.
PUB. DATE
September 2010
SOURCE
Physics of Plasmas;Sep2010, Vol. 17 Issue 9, p092305
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A fully nonlinear model is developed for the bump-on-tail instability including the effects of dynamical friction (drag) and velocity space diffusion on the energetic particles driving the wave. The results show that drag provides a destabilizing effect on the nonlinear evolution of waves. Specifically, in the early nonlinear phase of the instability, the drag facilitates the explosive scenario of the wave evolution, leading to the creation of phase space holes and clumps that move away from the original eigenfrequency. Later in time, the electric field associated with a hole is found to be enhanced by the drag, whereas for a clump it is reduced. This leads to an asymmetry of the frequency evolution between holes and clumps. The combined effect of drag and diffusion produces a diverse range of nonlinear behaviors including hooked frequency chirping, undulating, and steady state regimes. An analytical model is presented, which explains the aforementioned diversity. A continuous production of hole-clump pairs in the absence of collisions is also observed.
ACCESSION #
54049985

 

Related Articles

  • Bent Marshak waves. Hurricane, O. A.; Hammer, J. H. // Physics of Plasmas;Nov2006, Vol. 13 Issue 11, p113303 

    Radiation-driven heat waves (Marshak waves) are ubiquitous in astrophysics and terrestrial laser-driven high-energy density plasma physics experiments. Generally, the equations describing Marshak waves are so nonlinear, that solutions involving more than one spatial dimension require simulation....

  • Dissipation of an electron phase-space hole and its consequence on electron heating. Wu, Mingyu; Lu, Quanming; Huang, Can; Wang, Peiran; Wang, Rongsheng; Wang, Shui // Astrophysics & Space Science;Aug2014, Vol. 352 Issue 2, p565 

    An electron phase-space hole (electron hole) is considered to be unstable to the transverse instability. In this paper, two-dimensional (2D) electrostatic particle-in-cell (PIC) simulations are used to explore the dissipation process of a one-dimensional (1D) electron hole in a weakly magnetized...

  • Cross field diffusion and transport in a relativistic and beam-driven magnetoplasma: Collisional kinetics. Mohanty, J. N.; Baral, K. C. // Physics of Plasmas;Dec96, Vol. 3 Issue 12, p4410 

    Streaming or beam-driven kinetic theory is formulated for a relativistic and collisional plasma diffusing across magnetic field lines, including the small density and temperature gradient. Explicit formulas for modified transport coefficients are presented in various thermal regimes of interest....

  • Variational bounds for transport coefficients in three-dimensional toroidal plasmas. van Rij, W. I.; Hirshman, S. P. // Physics of Fluids B: Plasma Physics;Mar89, Vol. 1 Issue 3, p563 

    A variational principle is developed for the linearized drift-kinetic, Fokker–Planck equation, from which both upper and lower bounds for neoclassical transport coefficients can be calculated for plasmas in three-dimensional toroidal confinement geometries. These bounds converge...

  • Modified nonlinear evolution of Langmuir waves. Shah, Kushal // Physics of Plasmas;Jul2012, Vol. 19 Issue 7, p074502 

    Zakharov equations describe the nonlinear coupling between the electron and ion motion in a plasma mediated by the ponderomotive effect. It has been recently shown that the conventional ponderomotive theory has several limitations and under certain conditions, the plasma density depends on the...

  • The magnetic structures of electron phase-space holes formed in the electron two-stream instability. Wu, Mingyu; Lu, Quanming; Zhu, Jie; Du, Aimin; Wang, Shui // Astrophysics & Space Science;Mar2012, Vol. 338 Issue 1, p81 

    It is well known that the parallel cuts of the parallel and perpendicular electric field in electron phase-space holes (electron holes) have bipolar and unipolar structures, respectively. Recently, electron holes in the Earth's plasma sheet have been observed by THEMIS satellites to have...

  • Application of canonical profiles transport model to the H-mode shots in tokamaks. Dnestrovskij, Yu. N.; Dnestrovskij, A. Yu.; Danilov, A. V.; Lysenko, S. E.; Cherkasov, S. V.; Gerasimov, S. N.; Hender, T. C.; Voitsekhovitch, I. A.; Roach, C. M.; Walsh, M. J. // Plasma Physics Reports;Aug2010, Vol. 36 Issue 8, p645 

    The linear and nonlinear versions of the Canonical Profiles Transport Model (CPTM), which includes both heat and particle transport equations, are used to simulate core and pedestal plasma for JET, and MAST H-mode shots. Simulations by the nonlinear version show reasonable agreement with...

  • Nonlinear fan instability of electromagnetic waves. Krafft, C.; Volokitin, A. // Physics of Plasmas;Oct2010, Vol. 17 Issue 10, p102303 

    This paper studies the linear and nonlinear stages of the fan instability, considering electromagnetic waves of the whistler frequency range interacting resonantly with energetic electron fluxes in magnetized plasmas. The main attention is paid to determine the wave-particle interaction...

  • Driven magnetic reconnection near the Dreicer limit. Roytershteyn, V.; Daughton, W.; Dorfman, S.; Ren, Y.; Ji, H.; Yamada, M.; Karimabadi, H.; Yin, L.; Albright, B. J.; Bowers, K. J. // Physics of Plasmas;May2010, Vol. 17 Issue 5, p055706 

    The influence of Coulomb collisions on the dynamics of driven magnetic reconnection in geometry mimicking the Magnetic Reconnection eXperiment (MRX) [M. Yamada et al., Phys. Plasmas 4, 1936 (1997)] is investigated using two-dimensional (2D) fully kinetic simulations with a Monte Carlo treatment...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics