Correlation between laser accelerated MeV proton and electron beams using simple fluid model for target normal sheath acceleration

Tampo, M.; Awano, S.; Bolton, Paul R.; Kondo, Kiminori; Mima, K.; Mori, Yoshitaka; Nakamura, H.; Nakatsutsumi, M.; Stephens, R. B.; Tanaka, K. A.; Tanimoto, Tsuyoshi; Yabuuchi, T.; Kodama, R.

doi:10.1063/1.3459063

Cited by 13 publications

(8 citation statements)

References 19 publications

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“…Nonlinearity is higher than three order and susceptibility is described as true third-order tensors in CST code [41] . , close to the reported works [42,43] . The proton and electron divergence angles are set to 8° and 40°[ 44,45] ,…”

Section: Simulation Methodssupporting

confidence: 91%

Synchronous post-acceleration of laser-driven protons in helical coil targets by controlling the current dispersion

Liu

Mei

Kong

et al. 2023

High Pow Laser Sci Eng

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Post-acceleration of protons in helical coil targets driven by intense, ultrashort laser pulses can enhance ion energy by utilizing transient current from the targets' self-discharge. The acceleration length of protons can exceed a few millimeters, and the acceleration gradient is in the order of GeV/m. How to ensure the synchronization of the accelerating electric field with the protons is a crucial problem for efficient post-acceleration. In this paper, we study how the electric field mismatch induced by current dispersion affects the synchronous acceleration of protons. We propose a scheme using a two-stage helical coil to control the current dispersion. With optimized parameters, the energy gain of protons is increased by 4 times. Proton energy is expected to reach 45 MeV using a hundreds-terawatt laser, or more than 100 MeV using a petawatt laser, by controlling the current dispersion.

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Section: Simulation Methodssupporting

confidence: 91%

Synchronous post-acceleration of laser-driven protons in helical coil targets by controlling the current dispersion

Liu

Mei

Kong

et al. 2023

High Pow Laser Sci Eng

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“…For the first time, it allows a simultaneous and automatic online detection of the energy spectra and angular distribution of both laser-accelerated ions and electrons. We observed a correlation between the measured protons and electrons, as already predicted by various models [7,8] and confirmed in former experiments [9] for the well-known target normal sheath acceleration (TNSA) mechanism [10]. A precise study of this correlation will potentially enable a non-invasive measurement of the ion bunch parameters by detecting the electrons, taking a step towards various applications requiring an unperturbed but well characterized proton or ion bunch.…”

Section: Introductionsupporting

confidence: 84%

A novel approach to electron data background treatment in an online wide-angle spectrometer for laser-accelerated ion and electron bunches

Lindner

Englbrecht

et al. 2018

Review of Scientific Instruments

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Laser-based ion acceleration is driven by electrical fields emerging when target electrons absorb laser energy and consecutively leave the target material. A direct correlation between these electrons and the accelerated ions is thus to be expected and predicted by theoretical models. We report on a modified wide-angle spectrometer, allowing the simultaneous characterization of angularly resolved energy distributions of both ions and electrons. Equipped with online pixel detectors, the RadEye1 detectors, the investigation of this correlation gets attainable on a single shot basis. In addition to first insights, we present a novel approach for reliably extracting the primary electron energy distribution from the interfering secondary radiation background. This proves vitally important for quantitative extraction of average electron energies (temperatures) and emitted total charge.

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“…2 ) laser pulse onto a gas [1][2][3][4][5] or a solid [6][7][8][9][10][11][12][13][14] target. Two main regimes of laser-driven particle acceleration/heating can be identified, depending on the transparency properties of the ionized medium.…”

Section: Introductionmentioning

confidence: 99%

Electron heating by intense short-pulse lasers propagating through near-critical plasmas

et al. 2017

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We investigate the electron heating induced by a relativistic-intensity laser pulse propagating through a near-critical plasma. Using particle-in-cell simulations, we show that a specific interaction regime sets in when, due to the energy depletion caused by the plasma wakefield, the laser front profile has steepened to the point of having a length scale close to the laser wavelength. Wave breaking and phase mixing have then occurred, giving rise to a relativistically hot electron population following the laser pulse. This hot electron flow is dense enough to neutralize the cold bulk electrons during their backward acceleration by the wakefield. This neutralization mechanism delays, but does not prevent the breaking of the wakefield: the resulting phase mixing converts the large kinetic energy of the backward-flowing electrons into thermal energy greatly exceeding the conventional ponderomotive scaling at laser intensities > -10 W cm 21 2 and gas densities around 10% of the critical density. We develop a semi-numerical model, based on the Akhiezer-Polovin equations, which correctly reproduces the particle-in-cell-predicted electron thermal energies over a broad parameter range. Given this good agreement, we propose a criterion for full laser absorption that includes field-induced ionization. Finally, we show that our predictions still hold in a two-dimensional geometry using a realistic gas profile.

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Correlation between laser accelerated MeV proton and electron beams using simple fluid model for target normal sheath acceleration

Cited by 13 publications

References 19 publications

Synchronous post-acceleration of laser-driven protons in helical coil targets by controlling the current dispersion

Synchronous post-acceleration of laser-driven protons in helical coil targets by controlling the current dispersion

A novel approach to electron data background treatment in an online wide-angle spectrometer for laser-accelerated ion and electron bunches

Electron heating by intense short-pulse lasers propagating through near-critical plasmas

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