Ion acceleration at two collisionless shocks in a multicomponent plasma

Kumar, Rajesh; Sakawa, Y.; Sano, Takayoshi; Döhl, Leonard N. K.; Woolsey, N. C.; Morace, A.

doi:10.1103/physreve.103.043201

Cited by 7 publications

(2 citation statements)

References 78 publications

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“…Non-thermal high-energy particles exist in outer space [6] and are generated by the interactions, such as collisionless shocks, between the plasma flow and electromagnetic fields. To elucidate the generation mechanisms for non-thermal particles, laboratory-scale experiments and numerical simulations have been performed [7][8][9][10][11][12]. Particle-in-cell (PIC) simulations of high-power laser experiments have predicted the formation of electrostatic collisionless shocks and generation of reflected ion beams at the shock surface [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…To elucidate the generation mechanisms for non-thermal particles, laboratory-scale experiments and numerical simulations have been performed [7][8][9][10][11][12]. Particle-in-cell (PIC) simulations of high-power laser experiments have predicted the formation of electrostatic collisionless shocks and generation of reflected ion beams at the shock surface [9,10]. Moreover, a laboratory-scale experiment using pulsed-power discharge and its numerical simulations have demonstrated the generation of accelerated ions caused by the interaction between a fast plasma flow and perpendicular magnetic field [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Ion Beam Evolution by Applying Pulsed Magnetic Field to RF Plasma

Matsuzawa

Takezaki

Ito

2023

Plasma and Fusion Research

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We numerically investigated the ion behavior in radio frequency (RF) plasma with a pulsed magnetic field applied to a high-current ion source. A one-dimensional hybrid particle-in-cell (PIC) simulation was performed. The numerical results demonstrate the generation process of an ion beam by applying a pulsed magnetic field to the RF plasma. The pulsed magnetic field induces an electric field owing to the interaction between the plasma and the magnetic field. The induced electric field forms a density gradient, and an electrostatic field is generated. The electrostatic field propagates as an ion acoustic wave; some ions in the plasma are accelerated, and an ion beam is generated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Ion Beam Evolution by Applying Pulsed Magnetic Field to RF Plasma

Matsuzawa

Takezaki

Ito

2023

Plasma and Fusion Research

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Forward ion acceleration by laser-driven collisionless filamentary shocks in underdense plasmas

Kordell,

Russell,

Campbell

et al. 2024

Laser Part. Beams

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We have experimentally investigated the collisionless shock acceleration of ions via the interaction of a relativistic intensity (3 × 1019 W/cm2), 1.053 µm wavelength laser pulse with an underdense plasma. This plasma is formed through the use of a novel cluster jet design that allows for control of the plasma peak density and front scale length without the use of additional plasma-forming laser pulses. When the front density scale length of the target plasma is less than 60 µm, the laser pulse (1 J, 400 fs) is capable of launching an electrostatic shock wave that accelerates a proton beam. This beam is shown to have a narrow divergence angle of 0.8°, a peak flux of 14 × 106 protons/sr with an ion energy exceeding 440 keV. Particle-in-cell simulations indicate this narrow ion beam is produced by converging shocks generated via filamentation of the laser pulse in high-density (near critical) plasma.

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Generation of polarized proton beams with gaseous targets from CO2-laser-driven collisionless shock acceleration

Yan

Geng

et al. 2022

Physics of Plasmas

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We propose obtaining polarized proton beams based on CO2-laser-driven collisionless shock acceleration (CSA) of the pre-polarized HCl gas. By tailoring the density profile of the pre-polarized HCl gas, the intense CO2 laser pulse heats the plasma target and forms a strong shock that reflects the polarized protons to high energy. According to particle-in-cell simulations implemented with the spin dynamics, directional proton beams of several MeV were generated at a total beam polarization of over 80%. Simulations showed that proton spin precession occurred in the azimuthal magnetic fields generated by the Biermann effect and plasma currents. The latter was the main depolarization mechanism in the early stage of shock wave formation. For CSA at CO2 laser intensities around 1017–1018 W/cm2, the proton depolarization was insignificant and the beam polarization purity was preserved. As pre-polarized hydrogen targets were available at gaseous densities in-state-of-art facilities, CSA driven by relatively long wavelength lasers provided a feasible solution for obtaining ultra-fast polarized proton sources.

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Ion acceleration at two collisionless shocks in a multicomponent plasma

Cited by 7 publications

References 78 publications

Numerical Study of Ion Beam Evolution by Applying Pulsed Magnetic Field to RF Plasma

Numerical Study of Ion Beam Evolution by Applying Pulsed Magnetic Field to RF Plasma

Forward ion acceleration by laser-driven collisionless filamentary shocks in underdense plasmas

Generation of polarized proton beams with gaseous targets from CO2-laser-driven collisionless shock acceleration

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