TITLE

A 2D simulation study of Langmuir, whistler, and cyclotron maser instabilities induced by an electron ring-beam distribution

AUTHOR(S)
Lee, K. H.; Omura, Y.; Lee, L. C.
PUB. DATE
September 2011
SOURCE
Physics of Plasmas;Sep2011, Vol. 18 Issue 9, p092110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We carried out a series of 2D simulations to study the beam instability and cyclotron maser instability (CMI) with the initial condition that a population of tenuous energetic electrons with a ring-beam distribution is present in a magnetized background plasma. In this paper, weakly relativistic cases are discussed with the ring-beam kinetic energy ranging from 25 to 100 keV. The beam component leads to the two-stream or beam instability at an earlier stage, and the beam mode is coupled with Langmuir or whistler mode, leading to excitation of beam-Langmuir or beam-whistler waves. When the beam velocity is large with a strong beam instability, the initial ring-beam distribution is diffused in the parallel direction rapidly. The diffused distribution may still support CMI to amplify the X1 mode (the fundamental X mode). On the contrary, when the beam velocity is small and the beam instability is weak, CMI can amplify the Z1 (the fundamental Z mode) effectively while the O1 (the fundamental O mode) and X2 (the second harmonic X mode) modes are very weak and the X1 mode is not excited. In this report, different cases with various parameters are presented and discussed for a comprehensive understanding of ring-beam instabilities.
ACCESSION #
66184742

 

Related Articles

  • Electron Beam Driven Cyclotron Maser Radiation. Bingham, R.; Cairns, R. A.; Kellett, B. J. // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p700 

    We present results of a new cyclotron maser radiation mechanism driven by a crescent or horseshoe electron distribution function. Such distribution functions are easily created by an electron beam moving into a stronger magnetic field region, where conservation of the first adiabatic invariant...

  • Plasma maser with cyclotron resonance. Nambu, M.; Sakai, J.I. // Physics of Plasmas;Oct97, Vol. 4 Issue 10, p3703 

    Focuses on the plasma-maser process including whistler mode turbulence and a test Langmuir wave for weakly magnetized plasma. Effectiveness of the cyclotron resonant interaction between electrons and whistler mode for the growth of the Langmuir wave through the plasma-maser process; Expressions...

  • Net current generation and beam transport efficiency of grad-B-drift transported relativistic electron beams. Rose, D. V.; Welch, D. R.; Ottinger, P. F.; Schumer, J. W. // Physics of Plasmas;Nov2001, Vol. 8 Issue 11, p4972 

    Numerical simulations of grad-B drifting, high-current, relativistic electron beams are presented. The simulations use a hybrid fluid/particle-in-cell code to study the net-current and conductivity evolution for 200 to 900 kA, 1.3 MeV annular electron beams in a background gas of nitrogen (N[sub...

  • A cyclotron-maser instability associated with a nongyrotropic distribution. Freund, H. P.; Dong, J. Q.; Wu, C. S.; Lee, L. C. // Physics of Fluids (00319171);Oct87, Vol. 30 Issue 10, p3106 

    A stability analysis for the cyclotron-maser instability in the presence of a nongyrotropic electron distribution is presented. The model configuration describes a uniformly magnetized cold ambient plasma that contains a relatively diffuse suprathermal electron component coherently bunched in...

  • One-dimensional particle simulation of the filamentation instability: Electrostatic field driven by the magnetic pressure gradient force. Dieckmann, M. E.; Kourakis, I.; Borghesi, M.; Rowlands, G. // Physics of Plasmas;Jul2009, Vol. 16 Issue 7, p074502 

    Two counterpropagating cool and equally dense electron beams are modeled with particle-in-cell simulations. The electron beam filamentation instability is examined in one spatial dimension, which is an approximation for a quasiplanar filament boundary. It is confirmed that the force on the...

  • Simulation and theory for two-dimensional beam-plasma instability. Yi, Sumin; Rhee, Tongnyeol; Ryu, Chang-Mo; Yoon, Peter H. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122318 

    A comparative study of the dynamics of the electron beam-plasma system in two spatial dimensions is carried out by means of particle-in-cell (PIC) simulation and quasilinear theory. In the literature, the beam-plasma instability is usually studied with one-dimensional assumption. Among the few...

  • 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...

  • Plasma Wakefields in the Quasi-Nonlinear Regime. Rosenzweig, J. B.; Andonian, G.; Ferrario, M.; Muggli, P.; Williams, O.; Yakimenko, V.; Xuan, K. // AIP Conference Proceedings;11/5/2010, Vol. 1299 Issue 1, p500 

    It has long been noted that the nonlinear 'blowout' regime of the PWFA has certain critical aspects for producing high quality beams that are owed to the elimination of electron density and current inside of the beam-occupied region: time-independent, linear ion-focusing, and acceleration...

  • 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...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics