Proton array focused by a laser-irradiated mesh

Zhai, S. H.; Shen, Baifei; Borghesi, M.; Wang, W. P.; Zhang, H.; Kar, S.; Ahmed, H.; Li, J. F.; Li, S. S.; Wang, C.; Lu, Xiaoming; Wang, X. L.; Xu, Rui; Yu, Lianghong; Leng, Yuxin; Liang, Xiaoyan; Li, R. X.; Xu, Zhizhan

doi:10.1063/1.5054884

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…Spatial structuring of the beam may also have a role to play in future proton-imaging sources. For example, methods have been put forward for generating multiple separate sources from a single TNSA beam (Zhai et al, 2019), which may lead to additional backlighting capabilities. Similarly, techniques for producing collimated, quasimonoenergetic beamlets (Kar et al, 2016) may lead to opportunities for "spot scanning" of an extended field distribution, i.e., sampling portions of the field region in separate, consecutive shots and tracking the beamlet's deflection for each shot.…”

Section: A Advanced Sourcesmentioning

confidence: 99%

Proton imaging of high-energy-density laboratory plasmas

Schaeffer,

Bott,

Borghesi

et al. 2023

Rev. Mod. Phys.

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Proton imaging has become a key diagnostic for measuring electromagnetic fields in high-energydensity (HED) laboratory plasmas. Compared to other techniques for diagnosing fields, proton imaging is a measurement that can simultaneously offer high spatial and temporal resolution and the ability to distinguish between electric and magnetic fields without the protons perturbing the plasma of interest. Consequently, proton imaging has been used in a wide range of HED experiments, from

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Section: A Advanced Sourcesmentioning

confidence: 99%

Proton imaging of high-energy-density laboratory plasmas

Schaeffer,

Bott,

Borghesi

et al. 2023

Rev. Mod. Phys.

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“…with a collimator): at large θ p a wide spectrum is obtained with a sudden cutoff, while protons at low θ p exhibit a quasi-monoenergetic feature. External focusing with various well-established approaches (Toncian et al 2006;Albertazzi et al 2015;Zhai et al 2019) can be reliably employed in order to obtain a well-collimated beam for applications such as cancer therapy.…”

Section: Ev Formation and The Proton Accelerationmentioning

confidence: 99%

“…2015; Zhai et al. 2019) can be reliably employed in order to obtain a well-collimated beam for applications such as cancer therapy.…”

Section: Ev Formation and The Proton Accelerationmentioning

confidence: 99%

Proton acceleration in a laser-induced relativistic electron vortex

Pusztai

Pukhov

et al. 2019

J. Plasma Phys.

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We show that when a solid plasma foil with a density gradient on the front surface is irradiated by an intense laser pulse at a grazing angle, ${\sim}80^{\circ }$ , a relativistic electron vortex is excited in the near-critical-density layer after the laser pulse depletion. The vortex structure and dynamics are studied using particle-in-cell simulations. Due to the asymmetry introduced by non-uniform background density, the vortex drifts at a constant velocity, typically $0.2{-}0.3$ times the speed of light. The strong magnetic field inside the vortex leads to significant charge separation; in the corresponding electric field initially stationary protons can be captured and accelerated to twice the velocity of the vortex (100–200 MeV). A representative scenario – with laser intensity of $10^{21}~\text{W}~\text{cm}^{-2}$ – is discussed: two-dimensional simulations suggest that a quasi-monoenergetic proton beam can be obtained with a mean energy 140 MeV and an energy spread of ${\sim}10\,\%$ . We derive an analytical estimate for the vortex velocity in terms of laser and plasma parameters, demonstrating that the maximum proton energy can be controlled by the incidence angle of the laser and the plasma density gradient.

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All-optical edge-enhanced proton imaging driven by an intense vortex laser

et al. 2023

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An all-optical approach to edge-enhanced proton radiography is realized by using a relativistic vortex laser irradiating on nanometer-thick foil. In the proof-of-principle experiments, the hollow proton beam was successfully produced by the transparent target normal electric field sheath in the break-out after-burner acceleration mechanism, using a superintense Laguerre–Gauss laser with the highest intensity of the laser exceeded 1020 W/cm2. An insect was imaged with the proton beam; the leg structures on the edge were clearly captured. By contrast, the dot proton source produced by a Gaussian laser was almost completely blocked by the insect's body, losing most edge information. Hollow-structured proton beams driven by vortex lasers conquer the dot imaging limit for high-energy proton beams, which may benefit imaging of capsule implosions in inertial confined fusion, instability research on expanding plasma, and precise positioning in medical therapy.

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Proton array focused by a laser-irradiated mesh

Cited by 4 publications

References 38 publications

Proton imaging of high-energy-density laboratory plasmas

Proton imaging of high-energy-density laboratory plasmas

Proton acceleration in a laser-induced relativistic electron vortex

All-optical edge-enhanced proton imaging driven by an intense vortex laser

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