A laser parameter study on enhancing proton generation from microtube foil targets

Strehlow, Joseph; Kim, Joohwan; Bailly-Grandvaux, M.; Bolaños, S.; Herbie, Smith,; Haid, A.; Alfonso, E. L.; Aniculaesei, Constantin; Chen, Hui; Ditmire, T.; Donovan, M.; Hansen, Stephanie B.; Hegelich, B. M.; McLean, H. S.; Quevedo, Hernan; Spinks, M.; Beg, F. N.

doi:10.1038/s41598-022-14881-9

Cited by 6 publications

(1 citation statement)

References 74 publications

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“…Very recently, high-yield and high-energy ion generation by using thin foil targets with evenly spaced holes was performed. 32 In such an experiment, a 3D printer was used to place thin foils with holes at equal intervals on the surface of a solid plane target. They observed that the conversion efficiency from the laser beam to energetic electrons (Ee > 100 keV) enhanced to more than 50% at a laser intensity of 4 × 10 20 W/cm 2 by using such a target.…”

Section: Articlementioning

confidence: 99%

Experimental realization of near-critical-density laser wakefield acceleration: Efficient pointing 100-keV-class electron beam generation by microcapillary targets

Mori,

Barraza-Valdez,

Kotaki

et al. 2024

AIP Advances

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We experimentally demonstrated the generation of a pointing stable, low-divergence, low-energy electron beam driven by near-critical-density laser wakefield acceleration using a moderate low-intensity laser pulse. Electron beams with a half-beam divergence angle of ∼30 mrad were generated at laser intensities of 4 × 1016–1 × 1018 W/cm2 from a microcapillary hole. The pointing fluctuation of the electron beam was 1.8 mrad (root-mean-square) at the maximum laser intensity of 1 × 1018 W/cm2. The energies of the electron beam were up to 400 keV at 1 × 1018 W/cm2 and 50 keV even at 1 × 1016 W/cm2. We confirmed that the peak energy of the hump or cutoff energy of the electron beams was reproduced in particle-in-cell simulation. Such low divergence electron beam generation at sub-relativistic intensity (1016 to 1017 W/cm2 order) will lead to various applications of laser-driven keV-class electron beams, such as advanced radiotherapy.

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Section: Articlementioning

confidence: 99%

Experimental realization of near-critical-density laser wakefield acceleration: Efficient pointing 100-keV-class electron beam generation by microcapillary targets

Mori,

Barraza-Valdez,

Kotaki

et al. 2024

AIP Advances

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Collimation and energy enhancement in laser driven MeV protons

2023

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Enhancing the energy and controlling the divergence of proton beam have been crucial tasks since the development of laser-based ion accelerators. In this study, we employ 2D particle-in-cell EPOCH simulation to investigate a method to control the divergence and enhance the energy of MeV proton beam produced from the interaction of high intensity laser with a gold target. The energy and divergence of proton beam for the conventional laser-foil target configuration are compared with our proposed three laser-three target configuration. In the single laser-single target configuration, a high intensity laser irradiates a gold foil target resulting in proton acceleration from the plasma. In contrast, in the three laser-three target configuration, the generated proton beam is allowed to traverse through the configuration of two parallel Al plates irradiated with high intensity lasers. The new configuration provides the proton energy enhancements of 40% and more collimated beam compared to the single laser-foil target setup. This collimation and energy increase are due to the vertical and horizontal components of the electric field generated by the hot electron plasma of Al plates. The proton energy and divergence can also be tuned by varying the plasma electron density of the Al plasma. Also, the control of proton beam collimation is explored by varying target parameters as well, and it is observed that the separation between the Al plates and length of the Al plates plays major role in controlling the divergence of the beam. This study will have a significant impact in the ongoing laser fusion program, fast ignition, and laser ion therapy.

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Spatial distribution modulation of laser-accelerated charged particles with micro-tube structures

et al. 2023

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We present experimental studies on the spatial distribution of charged particles using a linearly polarized femtosecond laser interacting with a micro-structure target composed of micro-tube structure and planar foil. For protons, a six-lobed structure was observed in the low-energy region, while a smaller angular divergence was measured in the high-energy region. Electron distribution exhibits a circular distribution at low energies and double-lobed structure at high energies. These results are well reproduced by 3D particle-in-cell simulations, showing that the profile of electrons driven by a laser pulse is manipulated by the micro-tube structure, which maps into the spatial distribution of protons via a strong charge separation field. These results demonstrate the effect of micro-structures on laser-driven particle sources and provide a possible approach for spatial manipulation of the particle beams.

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A laser parameter study on enhancing proton generation from microtube foil targets

Cited by 6 publications

References 74 publications

Experimental realization of near-critical-density laser wakefield acceleration: Efficient pointing 100-keV-class electron beam generation by microcapillary targets

Experimental realization of near-critical-density laser wakefield acceleration: Efficient pointing 100-keV-class electron beam generation by microcapillary targets

Collimation and energy enhancement in laser driven MeV protons

Spatial distribution modulation of laser-accelerated charged particles with micro-tube structures

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