Acceleration of spin-polarized proton beams via two parallel laser pulses

Reichwein, Lars; Pukhov, A.; Büscher, M.

doi:10.1103/physrevaccelbeams.25.081001

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…Once the laser pulse fully penetrates foil, the polarization abruptly drops due to the highly oscillating laser fields. The degree of polarization with the CSA setup is generally much higher than what was obtained in the MVA studies [13,17], where, e.g. 77% polarization were obtained for the dual-pulse setup with two a 0 = 100 laser pulses.…”

Section: Laser Intensitymentioning

confidence: 56%

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Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities

Reichwein,

Shen,

Büscher

et al. 2024

Plasma Phys. Control. Fusion

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We investigate Collisionless Shock Acceleration of spin-polarized 3He for laser pulses with normalized vector potentials in the range a0 = 100-200. The setup utilized in the 2D-PIC simulations consists of a solid Carbon foil that is placed in front of the main Helium target. The foil is heated by the laser pulse and shields the Helium from the highly oscillating fields. In turn, a shock wave with more homogeneous fields is induced, leading to highly polarized ion beams. We observe that the inclusion of radiation reaction into our simulations leads to a higher beam charge without affecting the polarization degree to a significant extent.

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Section: Laser Intensitymentioning

confidence: 56%

“…In a preceding publication [17], a dual-pulse MVA setup was proposed that uses two co-propagating laser pulses with a carrier envelope phase difference of π. The presence of the two laser pulses creates an accelerating region for ions with decreased depolarization.…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities

Reichwein,

Shen,

Büscher

et al. 2024

Plasma Phys. Control. Fusion

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“…Laser-driven acceleration, with more than three orders of magnitude higher acceleration gradients than those of conventional accelerators, has become a promising approach for producing compact polarized particle sources. In order to generate highly spin-polarized proton beams, certain special schemes have been proposed, primarily involving laser pulses interacting with spin pre-polarized HCl or HT gas jets [15]; these include laser-driven bubble acceleration [16,17], direct laser pre-acceleration coupled wake-field acceleration in the bubble regime [18], and magnetic vortex acceleration [19][20][21]. These schemes are capable of producing polarized proton beams with energies in the range of tens of MeV to tens of GeV.…”

Section: Introductionmentioning

confidence: 99%

Enhanced polarized proton acceleration driven by femtosecond laser pulses irradiating a micro-structured solid–gas target

Yan¹,

Wu²,

Geng³

et al. 2023

Plasma Phys. Control. Fusion

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Herein, we propose a scheme based on collision-less shock acceleration (CSA) involving the use of composite targets comprising a micro-structured foil and pre-polarized gas for obtaining high-energy polarized proton beams. Femtosecond laser pulses irradiate a microwire-array (MWA) target and efficiently heat the dense plasma, which moves toward the dilute plasma. Shocks are then introduced in the pre-polarized gas and accelerate upstream spin-polarized protons to relativistic velocities. Based on particle-in-cell simulations with added spin dynamics, protons with energies of 30–300 MeV are produced, and the polarization rate of protons in the high-energy region exceeds 90%. The simulations demonstrate an evident increase in the temperature and number of hot electrons owing to the presence of MWA structures, which increase both the longitudinal electric field strength associated with the shock and the energy of the reflected protons. During CSA, the bipolar magnetic field driven by hot-electron currents demonstrates a weak effect on the polarization level of the accelerated protons, resulting in a high polarization rate. The relationship between the energy of the polarized proton beam and the hot-electron temperature enables an optimization of the micro-structured target or other target components to enhance proton quality via the CSA process.

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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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Acceleration of spin-polarized proton beams via two parallel laser pulses

Cited by 8 publications

References 36 publications

Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities

Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities

Enhanced polarized proton acceleration driven by femtosecond laser pulses irradiating a micro-structured solid–gas target

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

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Acceleration of spin-polarized proton beams via two parallel laser pulses

Cited by 8 publications

References 36 publications

Spin-polarized 3He shock waves from a solid-gas composite target at high laser intensities

Spin-polarized 3He shock waves from a solid-gas composite target at high laser intensities

Enhanced polarized proton acceleration driven by femtosecond laser pulses irradiating a micro-structured solid–gas target

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

Contact Info

Product

Resources

About

Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities

Spin-polarized ³He shock waves from a solid-gas composite target at high laser intensities