Controlling charge and current neutralization of an ion beam pulse in a background plasma by application of a solenoidal magnetic field: Weak magnetic field limit

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

doi:10.1063/1.3000131

Cited by 14 publications

(4 citation statements)

References 65 publications

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“…In particular, nonrelativistic ion beams can be used for heavy ion fusion and warm-dense matter experiments [11][12][13]. Neutralization of the ion beam is particularly important for the beam quality as the space charge may defocus the beam [14][15][16], which has been studied for underdense [15] and tenuous [17] plasmas. Longitudinal [18,19] and transverse compression [20][21][22][23] have also been investigated to increase the ion beam density.…”

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confidence: 99%

Generation of forerunner electron beam during interaction of ion beam pulse with plasma

2018

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The long-time evolution of the two-stream instability of a cold ion beam pulse propagating though the background plasma is investigated using a large-scale one-dimensional electrostatic kinetic simulation. The three stages of the instability are identified and investigated in detail. After the initial linear growth and saturation by the electron trapping, a portion of the initially trapped electrons becomes detrapped and moves ahead of the ion beam pulse forming a forerunner electron beam, which causes a secondary two-stream instability that preheats the upstream plasma electrons. Consequently, the self-consistent nonlinear-driven turbulent state is set up at the head of the ion beam pulse with the saturated plasma wave sustained by the influx of the cold electrons from the upstream of the beam that lasts until the final stage when the beam ions become trapped by the plasma wave. The beam ion trapping leads to the nonlinear heating of the beam ions that eventually extinguishes the instability.

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confidence: 99%

Generation of forerunner electron beam during interaction of ion beam pulse with plasma

2018

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“…In the following discussion, the displacement current ͑1 / c͒͑‫ץ‬E / ‫ץ‬t͒ is neglected. 17,18,24 Equation ͑3͒ gives…”

Section: Generation Mechanism Of Magnetic Fieldmentioning

confidence: 99%

Magnetic collimation of fast electrons in specially engineered targets irradiated by ultraintense laser pulses

Cai

Zhu

et al. 2011

Physics of Plasmas

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The efficient magnetic collimation of fast electron flow transporting in overdense plasmas is investigated with two-dimensional collisional particle-in-cell numerical simulations. It is found that the specially engineered targets exhibiting either high-resistivity-core-low-resistivity-cladding structure or low-density-core-high-density-cladding structure can collimate fast electrons. Two main mechanisms to generate collimating magnetic fields are found. In high-resistivity-corelow-resistivity-cladding structure targets, the magnetic field at the interfaces is generated by the gradients of the resistivity and fast electron current, while in low-density-core-high-density-cladding structure targets, the magnetic field is generated by the rapid changing of the flow velocity of the background electrons in transverse direction ͑perpendicular to the flow velocity͒ caused by the density jump. The dependences of the maximal magnetic field on the incident laser intensity and plasma density, which are studied by numerical simulations, are supported by our analytical calculations.

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“…The first is that when a charged particle beam is injected into a resistive plasma, we assume the beam is quickly neutralized by plasma electrons. This assumption holds as the beam duration time is much longer than the electron plasma period 2π/ω pe (ω pe is the electron plasma frequency) and the beam radius is much larger than the plasma electron skin depth c/ω pe (c is the light speed) (Kaganovich et al 2001(Kaganovich et al , 2008Berdanier, Roy & Kaganovich 2015). The second aspect is that the focusing we are describing here is the transverse compression of the entire beam.…”

Section: Theorymentioning

confidence: 99%

The self-focusing condition of a charged particle beam in a resistive plasma

Ning

Liang

et al. 2021

J. Plasma Phys.

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The self-focusing condition of a charged particle beam in a resistive plasma has been studied. When plasma heating is weak, the beam focusing is intensified by increasing the beam density or velocity. However, when plasma heating is strong, the beam focusing is only determined by the beam velocity. Especially, in weak heating conditions, the beam trends to be focused into the centre as a whole, and in strong heating conditions, a double-peak structure with a hollow centre is predicted to appear. Furthermore, it is found that the beam radius has a significant effect on focusing distance: a larger the beam radius will result in a longer focusing distance. Simulation results also show that when the beam radius is large enough, filamentation of the beam appears. Our results will serve as a reference for relevant beam–plasma experiments and theoretical analyses, such as heavy ion fusion and ion-beam-driven high energy density physics.

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Controlling charge and current neutralization of an ion beam pulse in a background plasma by application of a solenoidal magnetic field: Weak magnetic field limit

Cited by 14 publications

References 65 publications

Generation of forerunner electron beam during interaction of ion beam pulse with plasma

Generation of forerunner electron beam during interaction of ion beam pulse with plasma

Magnetic collimation of fast electrons in specially engineered targets irradiated by ultraintense laser pulses

The self-focusing condition of a charged particle beam in a resistive plasma

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