Effects of beam-plasma instabilities on neutralized propagation of intense ion beams in background plasma

Startsev, Edward A.; Kaganovich, Igor; Davidson, Ronald C.

doi:10.1016/j.nima.2013.05.090

Cited by 14 publications

(23 citation statements)

References 9 publications

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“…Therefore, in the case of an ion beam propagating in background plasma in the presence of the two-stream instability both the radial electric field and the reversal of the selfmagnetic field act together to defocus the beam as it propagates. Furthermore, high intensity longitudinal electric fields of plasma waves generated by two-stream instability can strongly modulate the density of propagating ion beam longitudinally -produce bunching of initially long beam pulses [34,35,36,37].…”

Section: This Paper Reviews Past Theoretical and Experimental Studies...mentioning

confidence: 99%

Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma

et al. 2018

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Propagation of charged particle beams in background plasma as a method of space charge neutralization has been shown to achieve a high degree of charge and current neutralization and therefore enables nearly ballistic propagation and focusing of charged particle beams. Correspondingly, use of plasmas for propagation of charged particle beams has important applications for transport and focusing of intense particle beams in inertial fusion and high energy density laboratory plasma physics. However, the streaming of beam ions through a background plasma can lead to development of the two-stream instability between the beam ions and the plasma electrons. The beam electric and magnetic fields enhanced by the two-stream instability can lead to defocusing of the ion beam. Using particle-in-cell (PIC) simulations, we study the scaling of the instability-driven self-electromagnetic fields and consequent defocusing forces with the background plasma density and beam ion mass. We identify plasma parameters where the defocusing forces can be reduced.

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Section: This Paper Reviews Past Theoretical and Experimental Studies...mentioning

confidence: 99%

Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma

et al. 2018

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“…26 Note also that the neutralization of the beam charge occurs on the plasma period scale, which is less than one nanosecond for these beam parameters. In general, the fast variations of the beam density on the scales faster than the plasma period-a nanoseconds duration for our parameters may drive large amplitude plasma waves, see, e.g., Ref.…”

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confidence: 91%

“…It has been long known that the two-stream instability can strongly affect the return current formation in plasmas. [26][27][28][29][30][31][32][33][34] Under some conditions, the two-stream instability causes plasma electrons to follow the ion beam with the mean velocity approaching the beam velocity. Without the instability electrons in return current of an ion beam propagating in plasma would flow in the direction of the beam velocity with the velocity proportional to the beam velocity times ratio of the beam density to background plasma density, v b n b =n p ; this flow originates from the inductive electric field induced by the beam pulse in plasma and is formed in response to timedependent beam self-magnetic field.…”

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“…30 and 31 for electron beams and was demonstrated using particle-incell simulations for electron 28 and ion beams. 26,34 The oscillations of the potential due to the two-stream instability were measured in Refs. 8 and 32 for an ion beam and agree with theoretical predictions.…”

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“…The defocusing force scales as F def ocusing $ m e v 2 b =2r b . 26 With such a force for the beam radius to double under action of the defocusing forces, the beam should propagate a distance 26…”

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Defocusing of an ion beam propagating in background plasma due to two-stream instability

Tokluoglu

Kaganovich

2015

Physics of Plasmas

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The current and charge neutralization of charged particle beams by background plasma enable ballistic beam propagation and have a wide range of applications in inertial fusion and high energy density physics. However, the beam-plasma interaction can result in the development of collective instabilities that may have deleterious effects on ballistic propagation of an ion beam. In the case of fast, light-ion beams, non-linear fields created by instabilities can lead to significant defocusing of the beam. We study an ion beam pulse propagating in a background plasma, which is subjected to two-stream instability between the beam ions and plasma electrons, using PIC code LSP. The defocusing effects of the instability on the beam can be much more pronounced in small radius beams. We show through simulations that a beamlet produced from an ion beam passed through an aperture can be used as a diagnostic tool to identify the presence of the two-stream instability and quantify its defocusing effects. The effect can be observed on the Neutralized Drift Compression Experiment-II facility by measuring the spot size of the extracted beamlet propagating through several meters of plasma.

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Longitudinal instabilities of the experimentally generated laser accelerated ion beam relevant to fast ignition

Khoshbinfar

2017

Nuclear Instruments and Methods in Physics Research Section A:

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Effects of beam-plasma instabilities on neutralized propagation of intense ion beams in background plasma

Cited by 14 publications

References 9 publications

Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma

Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma

Defocusing of an ion beam propagating in background plasma due to two-stream instability

Longitudinal instabilities of the experimentally generated laser accelerated ion beam relevant to fast ignition

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