Two-stream stability assessment of intense heavy ion beams propagating in a plasma immersed in an axial magnetic field

Rose, D. V.; Genoni, T. C.; Welch, D. R.; Lee, E.P.

doi:10.1016/j.nima.2005.01.266

Cited by 12 publications

(3 citation statements)

References 8 publications

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“…Unlike all previous analyses [8][9][10] Because the residual maximum growth rate is of order the electron cyclotron frequency in the layer, the mode frequency is strongly affected by the layer self-magnetic field. The detailed analysis of the dispersion function W (ω) in Sec.…”

Section: Discussionmentioning

confidence: 92%

“…One of the fastest instabilities involving the lightest species is the two-stream instability between the electrons flowing inside the beam and the stationary electrons outside the beam. Such an instability has been studied previously by several authors and has been shown to have maximum growth rate of the order of the background electron plasma frequency ω pe = (4πe 2 n e0 /m e ) 1/2 [8][9][10]. Here −e is the electron charge and m e is the electron mass.…”

Section: Introductionmentioning

confidence: 87%

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Two-stream Stability Properties of the Return-Current Layer for Intense Ion Beam Propagation Through Background Plasma

Startsev¹

2009

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When an ion beam with sharp edge propagates through a background plasma, its current is neutralized by the plasma return current everywhere except at the beam edge over a characteristic transverse distance ∆x ⊥ ∼ δ pe , where δ pe = c/ω pe is the collisionless skin depth, and ω pe is the electron plasma frequency. Because the background plasma electrons neutralizing the ion beam current inside the beam are streaming relative to the background plasma electrons outside the beam, the background plasma can support a two-stream surfacemode excitation. Such surface modes have been studied previously assuming complete charge and current neutralization, and have been shown to be strongly unstable. In this paper we study the detailed stability properties of this two-stream surface mode for an electron flow velocity profile self-consistently driven by the ion beam. In particular, it is shown that the self-magnetic field generated inside the unneutralized current layer, which has not been taken into account previously, completely eliminates the instability.

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 87%

Two-stream Stability Properties of the Return-Current Layer for Intense Ion Beam Propagation Through Background Plasma

Startsev¹

2009

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“…For a recent review of collective beam-plasma instabilities see Davidson et al (2004Davidson et al ( , 2009. In a recent paper (Startsev et al, 2009), we have reconsidered the stability of the background electron return current, found to be strongly unstable by many previous authors (Rose et al, 2003(Rose et al, , 2005. We have shown that the unneutralized magnetic field in the return current layer is responsible for complete stabilization of this particular instability.…”

Section: Introductionmentioning

confidence: 87%

Stability properties of the electron return current for intense ion beam propagation through background plasma

2011

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When an intense ion beam propagates through a dense background plasma, its current is partially neutralized by the electron plasma return current. Due to the non-uniformity of the background plasma electrons longitudinal velocity profile ${\bar v}$(r), the flow can be unstable. The instability is similar to the Kelvin-Helmholz instability for the non-uniform flow of an incompressible neutral fluid, with the electrostatic potential playing the role of pressure. For the case of electron return current flow, the significant new feature is the presence of the partially self-neutralized magnetic field of the ion beam, which significantly affects the evolution of small-amplitude excitations. In this paper the stability properties of the flow of electrons making up the plasma return current is investigated using the macroscopic cold-fluid-Maxwell equations. It is shown that this flow may become unstable, but the instability growth rates are exponentially small. This unstable body mode is qualitatively different from previously studied surface-mode excitations of the electron plasma return current for an intense ion beam with a sharp radial boundary, which is found to be stable due to the stabilizing influence of the partially neutralized magnetic field of the ion beam.

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Multispecies Weibel instability for intense charged particle beam propagation through neutralizing background plasma

Davidson

Kaganovich

Startsev

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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Two-stream stability assessment of intense heavy ion beams propagating in a plasma immersed in an axial magnetic field

Cited by 12 publications

References 8 publications

Two-stream Stability Properties of the Return-Current Layer for Intense Ion Beam Propagation Through Background Plasma

Two-stream Stability Properties of the Return-Current Layer for Intense Ion Beam Propagation Through Background Plasma

Stability properties of the electron return current for intense ion beam propagation through background plasma

Multispecies Weibel instability for intense charged particle beam propagation through neutralizing background plasma

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