Kinetic description of neutralized drift compression and transverse focusing of intense ion charge bunches

Davidson, Ronald C.; Qin, Hong

doi:10.1103/physrevstab.8.064201

Cited by 21 publications

(6 citation statements)

References 19 publications

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“…We have performed quantitative comparisons of the simulation results with our experimental data, and the agreements with experiments were excellent [12,14]. A three-dimensional kinetic model for longitudinal compression with complete neutralization was developed, and the Vlasov equation was shown to possess a class of exact solutions for the problem [15]. Theories of beam-plasma interaction, with and without external focusing solenoids, have been studied extensively [16][17][18].…”

Section: Longitudinal and Transverse Beam Compressionmentioning

confidence: 69%

“…In both the transverse and longitudinal experiments, extensive 3-D simulations, using LSP, were carried out, and the agreement with experiments was excellent [4]. A three-dimensional kinetic model for longitudinal compression was developed, and it was shown that the Vlasov equation possesses a class of exact solutions for the problem [5].…”

Section: Longitudinal and Transverse Beam Compressionmentioning

confidence: 99%

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Heavy-ion-fusion-science: summary of US progress

Yu¹,

Logan²,

Barnard³

et al. 2007

Nucl. Fusion

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Over the past two years noteworthy experimental and theoretical progress has been made towards the top-level scientific question for the US programme on heavy-ion-fusion-science and high energy density physics: ‘How can heavy-ion beams be compressed to the high intensity required to create high energy density matter and fusion conditions?’ New results in transverse and longitudinal beam compression, high-brightness transport and beam acceleration will be reported. Central to this campaign is final beam compression. With a neutralizing plasma, we demonstrated transverse beam compression by an areal factor of over 100 and longitudinal compression by a factor of > 50. We also report on the first demonstration of simultaneous transverse and longitudinal beam compression in plasma. High beam brightness is key to high intensity on target, and detailed experimental and theoretical studies on the effect of secondary electrons on beam brightness degradation are reported. A new accelerator concept for near-term low-cost target heating experiments was invented, and the predicted beam dynamics validated experimentally. We show how these scientific campaigns have created new opportunities for interesting target experiments in the warm dense matter regime. Finally, we summarize progress towards heavy-ion fusion, including the demonstration of a compact driver-size high-brightness ion injector. For all components of our high intensity campaign, the new results have been obtained via tightly coupled efforts in experiments, simulations and theory.

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Section: Longitudinal and Transverse Beam Compressionmentioning

confidence: 69%

Section: Longitudinal and Transverse Beam Compressionmentioning

confidence: 99%

Heavy-ion-fusion-science: summary of US progress

Yu¹,

Logan²,

Barnard³

et al. 2007

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…The propagation of an intense ion beam pulse through the background plasma has been investigated theoretically through the warm-fluid [15], kinetic [16], hybrid fluid-Vlasov [17], and particle-in-cell simulations [7][8][9]. It is shown that for long, nonrelativistic ion beams, charge neutralization is complete even for very tenuous background plasmas.…”

Section: Introductionmentioning

confidence: 99%

Self-pinched ion beam transport in plasmas with finite radius and nonuniform transverse density

Hu¹,

Wang²

2015

Plasma Phys. Control. Fusion

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The self-pinched ion beam transport in plasmas with finite radius and nonuniform transverse density profile are investigated with a two-dimensional electromagnetic particle-in-cell simulation code. Electron holes are formed in such plasmas due to the attraction of the ion beam and are shown to propagate with the ion beam. The ion beam charge can be overcompensated by the plasma electrons provided that the radial density distribution of the ion beam overlaps with the electron holes. In this case, the radial electric field exerted on the beam ions increases significantly and becomes focusing. The plasma return current is found to enhance the ion beam current, leading to a higher self-pinched force in the radial direction. An ion beam with higher density and small radius thus can be obtained in such plasmas, which is favorite for the self-pinched ion beam transport.

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“…III. Finally, for the case of neutralized drift compression, a fully kinetic model based on the Vlasov equation has been developed that describes the longitudinal compression and transverses focusing of an intense ion charge bunch propagating through a background plasma that provides complete charge and current neutralization in a solenoidal magnetic field [39]. + ion charge bunch injected into a 1.4-m -long plasma column, at different times (superimposed).…”

Section: Iid Studies Of Beam Compression and Focusingmentioning

confidence: 99%

“…For fusion energy applications, either un-neutralized [29 -31] or neutralized [32][33][34][35][36][37][38][39] compression may be considered. In the un-neutralized case, to describe the drift compression dynamics and the final focus of the beam particles to a common axial plane and prescribed focal spot size, a warm-fluid model has been employed to describe the longitudinal dynamics of drift compression, coupled nonlinearly to envelope equations that describe the self-consistent transverse dynamics and focusing of the ion beam as it propagates through the quadrupole focusing lattice [30,31].…”

Section: Iid Studies Of Beam Compression and Focusingmentioning

confidence: 99%