Collisional effects on the oblique instability in relativistic beam-plasma interactions

Hao, B.; Ding, W. J.; Sheng, Z. M.; Ren, C.; Kong, X.; Mu, J.; Zhang, J.
July 2012
Physics of Plasmas;Jul2012, Vol. 19 Issue 7, p072709
Academic Journal
The general oblique instability for a relativistic electron beam propagating through a warm and resistive plasma is investigated fully kinetically by a variable rotation method. Analysis shows that the electrostatic part of the oblique instability is attenuated and eventually stabilized by collisional effects. However, the electromagnetic part of the oblique instability (EMOI) is enhanced. Since the current-filamentation instability as a special case of the EMOI has a larger growth rate, it becomes dominant in the collisional case as shown in our two-dimensional particle-in-cell simulations. While the beam diverges in the collisionless case, it can become magnetically collimated in the collisional case due to stabilization of the electrostatic instabilities when the initial beam spreading angle is less than certain magnitude such as a dozen degrees.


Related Articles

  • Analytic model of electron beam thermalization during the resistive Weibel instability. Siemon, Carl; Khudik, Vladimir; Shvets, Gennady // Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103109 

    A novel theoretical model for underdense electron beam propagation during the nonlinear stage of the resistive Weibel instability (WI) is presented and is used to calculate the stopping time of the beam. The model and supporting simulation results lead to the conclusion that the WI initially...

  • Two-Dimensional Particle Simulation of Electrostatic Solitary Waves with an Open Boundary Condition. Umeda, T.; Omura, Y.; Matsumoto, H.; Usui, H. // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p735 

    We study formation process of two-dimensional electrostatic solitary waves observed by the GEOTAIL spacecraft. Previous simulation studies have confirmed that the electrostatic solitary waves correspond to BGK electron holes formed through nonlinear evolution of electron beam instabilities. In...

  • Computationally efficient description of relativistic electron beam transport in collisionless plasma. Polomarov, Oleg; Sefkow, Adam B.; Kaganovich, Igor; Shvets, Gennady // Physics of Plasmas;Apr2007, Vol. 14 Issue 4, p043103 

    A reduced approach to modeling the electromagnetic Weibel instability and relativistic electron beam transport in collisionless background plasma is developed. Beam electrons are modeled by macroparticles and the background plasma is represented by electron fluid. Conservation of generalized...

  • An empirical model of collective electrostatic effects for laser-beam channeling in long-scale-length relativistic plasmas. Yang, Jeong-Hoon; Craxton, R. Stephen // Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p082703 

    This work investigates the capability of ultraintense lasers with irradiance from 1018 to 1021 W cm-2 to produce highly energetic electron beams from a Gaussian focus in a low-density plasma. A simple particle simulation code including a physical model of collective electrostatic effects in...

  • Simulation of relativistically colliding laser-generated electron flows. Yang, X. H.; Dieckmann, M. E.; Sarri, G.; Borghesi, M. // Physics of Plasmas;Nov2012, Vol. 19 Issue 11, p113110 

    The plasma dynamics resulting from the simultaneous impact, of two equal, ultra-intense laser pulses, in two spatially separated spots, onto a dense target is studied via particle-in-cell simulations. The simulations show that electrons accelerated to relativistic speeds cross the target and...

  • Whistler anisotropy instability at low electron β: Particle-in-cell simulations. Gary, S. Peter; Liu, Kaijun; Winske, Dan // Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p082902 

    The whistler anisotropy instability is studied in a magnetized, homogeneous, collisionless plasma model. The electrons (denoted by subscript e) are represented initially with a single bi-Maxwellian velocity distribution with a temperature anisotropy T⊥e/T∥e>1, where ⊥ and ∥...

  • Two-fluid simulations of shock wave propagation and shock-bubble interaction in collisionless plasma. Mori, Koichi // Physics of Plasmas;Mar2012, Vol. 19 Issue 3, p032311 

    The propagation of collisionless shock waves and the influence of the space-charge field on the development of fluid instabilities induced by a collisionless shock wave are investigated by solving the two-fluid plasma equations numerically in two space-dimensions. A second-order accurate Riemann...

  • Electrostatic Shocks Formed by Ion-Beam Velocity Modulation in a Q-Machine Plasma. Gohda, Takuma; Ishiguro, Seiji; Iizuka, Satoru; Sato, Noriyoshi // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p14 

    Nonlinear spatial evolutions of velocity-modulated ion beams along a magnetized plasma column are investigated by computer simulation for a Q machine where no electrostatic shock formation is observed for density-modulated ion perturbations. In case of the velocity modulation, the perturbations...

  • Multidimensional electron beam-plasma instabilities in the relativistic regime. Bret, A.; Gremillet, L.; Dieckmann, M. E. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p120501 

    The interest in relativistic beam-plasma instabilities has been greatly rejuvenated over the past two decades by novel concepts in laboratory and space plasmas. Recent advances in this long-standing field are here reviewed from both theoretical and numerical points of view. The primary focus is...


Read the Article


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

Try another library?
Sign out of this library

Other Topics