Particle-acceleration in lower-hybrid cavitons

R. Bingham, J. J. Su, V. D. Shapiro, V. Shevchenko, S. Ma, J. M. Dawson, V. N. Tsytovich

Research output: Contribution to journalConference Contribution

2 Citations (Scopus)

Abstract

In this paper we investigate particle acceleration resulting from the relaxation of unstable ion ring distributions, producing strong wave activity at the lower hybrid frequency. It is shown that strong lower hybrid wave turbulence collapses in configuration space producing density cavities containing intense electrostatic lower hybrid wave activity. The collapse of these intense nonlinear wavepackets saturate by particle acceleration producing energetic electron and ion tails. There are several mechanisms whereby unstable ion distributions could be formed in plasmas, including reflection at perpendicular shocks, tearing modes, and loss cone depletion.Numerical simulations of ion ring relaxation processes, obtained using a 2½-D fully electromagnetic, relativistic particle in cell code are discussed. We apply the results to the problem of explaining energetic particle production in solar flares. The results show the simultaneous acceleration of both electrons and ions to very high energies: electrons are accelerated to energies in the range 10-500 keV, while ions are accelerated to energies of the order of MeV's. Our simulations also show wave generation at the electron cyclotron frequency. The strong turbulence collapse process leads to a highly filamented plasma producing many localized regions for particle acceleration of width ≃ 10λDe.

Fingerprint

cavitons
particle acceleration
Electron
ions
Turbulence
Plasma
Unstable
turbulence
Solar Flares
Ring
electrons
space density
ion distribution
relativistic particles
wave generation
rings
cyclotron frequency
particle production
energetic particles
Depletion

Keywords

  • particle acceleration
  • ion rings
  • electrons
  • plasma

Cite this

Bingham, R., Su, J. J., Shapiro, V. D., Shevchenko, V., Ma, S., Dawson, J. M., & Tsytovich, V. N. (1994). Particle-acceleration in lower-hybrid cavitons. Physica Scripta, T52, 20-27. https://doi.org/10.1088/0031-8949/1994/T52/003
Bingham, R. ; Su, J. J. ; Shapiro, V. D. ; Shevchenko, V. ; Ma, S. ; Dawson, J. M. ; Tsytovich, V. N. / Particle-acceleration in lower-hybrid cavitons. In: Physica Scripta. 1994 ; Vol. T52. pp. 20-27.
@article{287dcc5e809c47e685f479ab8c3c5ef5,
title = "Particle-acceleration in lower-hybrid cavitons",
abstract = "In this paper we investigate particle acceleration resulting from the relaxation of unstable ion ring distributions, producing strong wave activity at the lower hybrid frequency. It is shown that strong lower hybrid wave turbulence collapses in configuration space producing density cavities containing intense electrostatic lower hybrid wave activity. The collapse of these intense nonlinear wavepackets saturate by particle acceleration producing energetic electron and ion tails. There are several mechanisms whereby unstable ion distributions could be formed in plasmas, including reflection at perpendicular shocks, tearing modes, and loss cone depletion.Numerical simulations of ion ring relaxation processes, obtained using a 2½-D fully electromagnetic, relativistic particle in cell code are discussed. We apply the results to the problem of explaining energetic particle production in solar flares. The results show the simultaneous acceleration of both electrons and ions to very high energies: electrons are accelerated to energies in the range 10-500 keV, while ions are accelerated to energies of the order of MeV's. Our simulations also show wave generation at the electron cyclotron frequency. The strong turbulence collapse process leads to a highly filamented plasma producing many localized regions for particle acceleration of width ≃ 10λDe.",
keywords = "particle acceleration, ion rings, electrons, plasma",
author = "R. Bingham and Su, {J. J.} and Shapiro, {V. D.} and V. Shevchenko and S. Ma and Dawson, {J. M.} and Tsytovich, {V. N.}",
year = "1994",
doi = "10.1088/0031-8949/1994/T52/003",
language = "English",
volume = "T52",
pages = "20--27",
journal = "Physica Scripta",
issn = "0031-8949",

}

Bingham, R, Su, JJ, Shapiro, VD, Shevchenko, V, Ma, S, Dawson, JM & Tsytovich, VN 1994, 'Particle-acceleration in lower-hybrid cavitons' Physica Scripta, vol. T52, pp. 20-27. https://doi.org/10.1088/0031-8949/1994/T52/003

Particle-acceleration in lower-hybrid cavitons. / Bingham, R.; Su, J. J.; Shapiro, V. D.; Shevchenko, V.; Ma, S.; Dawson, J. M.; Tsytovich, V. N.

In: Physica Scripta, Vol. T52, 1994, p. 20-27.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Particle-acceleration in lower-hybrid cavitons

AU - Bingham, R.

AU - Su, J. J.

AU - Shapiro, V. D.

AU - Shevchenko, V.

AU - Ma, S.

AU - Dawson, J. M.

AU - Tsytovich, V. N.

PY - 1994

Y1 - 1994

N2 - In this paper we investigate particle acceleration resulting from the relaxation of unstable ion ring distributions, producing strong wave activity at the lower hybrid frequency. It is shown that strong lower hybrid wave turbulence collapses in configuration space producing density cavities containing intense electrostatic lower hybrid wave activity. The collapse of these intense nonlinear wavepackets saturate by particle acceleration producing energetic electron and ion tails. There are several mechanisms whereby unstable ion distributions could be formed in plasmas, including reflection at perpendicular shocks, tearing modes, and loss cone depletion.Numerical simulations of ion ring relaxation processes, obtained using a 2½-D fully electromagnetic, relativistic particle in cell code are discussed. We apply the results to the problem of explaining energetic particle production in solar flares. The results show the simultaneous acceleration of both electrons and ions to very high energies: electrons are accelerated to energies in the range 10-500 keV, while ions are accelerated to energies of the order of MeV's. Our simulations also show wave generation at the electron cyclotron frequency. The strong turbulence collapse process leads to a highly filamented plasma producing many localized regions for particle acceleration of width ≃ 10λDe.

AB - In this paper we investigate particle acceleration resulting from the relaxation of unstable ion ring distributions, producing strong wave activity at the lower hybrid frequency. It is shown that strong lower hybrid wave turbulence collapses in configuration space producing density cavities containing intense electrostatic lower hybrid wave activity. The collapse of these intense nonlinear wavepackets saturate by particle acceleration producing energetic electron and ion tails. There are several mechanisms whereby unstable ion distributions could be formed in plasmas, including reflection at perpendicular shocks, tearing modes, and loss cone depletion.Numerical simulations of ion ring relaxation processes, obtained using a 2½-D fully electromagnetic, relativistic particle in cell code are discussed. We apply the results to the problem of explaining energetic particle production in solar flares. The results show the simultaneous acceleration of both electrons and ions to very high energies: electrons are accelerated to energies in the range 10-500 keV, while ions are accelerated to energies of the order of MeV's. Our simulations also show wave generation at the electron cyclotron frequency. The strong turbulence collapse process leads to a highly filamented plasma producing many localized regions for particle acceleration of width ≃ 10λDe.

KW - particle acceleration

KW - ion rings

KW - electrons

KW - plasma

UR - http://iopscience.iop.org/1402-4896/

U2 - 10.1088/0031-8949/1994/T52/003

DO - 10.1088/0031-8949/1994/T52/003

M3 - Conference Contribution

VL - T52

SP - 20

EP - 27

JO - Physica Scripta

T2 - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

ER -

Bingham R, Su JJ, Shapiro VD, Shevchenko V, Ma S, Dawson JM et al. Particle-acceleration in lower-hybrid cavitons. Physica Scripta. 1994;T52:20-27. https://doi.org/10.1088/0031-8949/1994/T52/003