High-energy proton generation and suppression of transverse proton divergence by localized electrons in a laser-foil interaction

Miyazaki, Shuji; Kawata, Shigeo; Sonobe, R.; Kikuchi, Takashi

doi:10.1103/physreve.71.056403

Cited by 25 publications

(13 citation statements)

References 23 publications

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“…In the laser-foil interaction, the ion dynamics is affected directly by the behavior of the electrons. 19,27,28 The electrons form a strong electric field, and the ions are accelerated by the electric field. When a foil target has backside multiholes at the target rear side, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Efficient energy conversion from laser to proton beam in a laser-foil interaction

et al. 2010

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Demonstrated is a remarkable improvement on the energy conversion efficiency from laser to protons in a laser-foil interaction by particle simulations. The total laser-proton energy conversion efficiency becomes 16.7%, although a conventional plane foil target serves a rather low efficiency. In our previous study we found that Al multihole thin-foil target was efficient for the energy conversion from laser to protons ͓Y. Nodera and S. Kawata, Phys. Rev. E 78, 046401 ͑2008͔͒, and the energy conversion efficiency was 9.3%. In our 2.5-dimensional particle-in-cell simulations the Al multihole structure is also employed, and the parameters of the Al multihole wing width and length are optimized in the paper. The present results clarify the roles of the target Al hole width and depth in the laser-proton energy conversion. The main physical reason for the enhancement of the conversion efficiency is a reduction of the laser reflection at the target surface area. The optimized multihole foil target provides a remarkable increase in the laser-proton energy conversion efficiency as shown above.

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Section: Introductionmentioning

confidence: 99%

Efficient energy conversion from laser to proton beam in a laser-foil interaction

et al. 2010

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“…On the other hand, ion beams are useful for medical ion cancer therapy, basic particle physics, controlled nuclear fusion, high-energy sources, and so on [1][2][3][4][5][6][7][8][9][10] . The energy of ions, which are accelerated in an interaction between an intense laser pulse and a gas target, is over a few tens of MeV [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

“…The energy of ions, which are accelerated in an interaction between an intense laser pulse and a gas target, is over a few tens of MeV [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . The issues in laser ion acceleration include ion beam collimation [10,11,15] , ion energy spectrum control, ion production efficiency [24,25] , ion energy control, and ion beam bunching. Depending on the ion beam applications, the ion particle energy and the ion energy spectrum should be controlled as well as the ion beam quality.…”

Section: Introductionmentioning

confidence: 99%

Controllability of intense-laser ion acceleration

Kawata

Takano

Izumiyama

et al. 2014

High Pow Laser Sci Eng

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An ion beam has the unique feature of being able to deposit its main energy inside a human body to kill cancer cells or inside material. However, conventional ion accelerators tend to be huge in size and cost. In this paper, a future intenselaser ion accelerator is discussed to make the laser-based ion accelerator compact and controllable. The issues in the laser ion accelerator include the energy efficiency from the laser to the ions, the ion beam collimation, the ion energy spectrum control, the ion beam bunching, and the ion particle energy control. In the study, each component is designed to control the ion beam quality by particle simulations. The energy efficiency from the laser to ions is improved by using a solid target with a fine sub-wavelength structure or a near-critical-density gas plasma. The ion beam collimation is performed by holes behind the solid target or a multi-layered solid target. The control of the ion energy spectrum and the ion particle energy, and the ion beam bunching are successfully realized by a multi-stage laser-target interaction.

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“…Some of the electrons placed at the surface irradiated by the laser are accelerated. The electrons form a high current and generate a strong magnetic field [25], [26]. The electrons form a strong electric field at the surface of the foil, and the ions are accelerated by the electric field.…”

Section: Introductionmentioning

confidence: 99%

Efficient Production of Proton Beam in Laser-Illuminated Tailored Microstructured Target

Kawata

Nodera

Limpouch

et al. 2009

IEEE Trans. Plasma Sci.

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In a proton beam generation by a laser-foil interaction, significant improvement of energy-conversion efficiency from laser to proton beam is presented by particle simulations. When an intense short-pulse laser illuminates the thin-foil target, the foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the foil protons, and the proton beam is generated. In this paper, a tailored multihole thin-foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the foil target enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the tailored multihole target, although the energy-conversion efficiency is 1.5% for a plain thin-foil target. The maximum proton energy is 10.0 MeV for the multihole target and is 3.14 MeV for the plain target. The transpiercing multihole target serves a new method to increase the energy-conversion efficiency from laser to ions.Index Terms-Efficient ion beam generation, laser absorption, laser ion acceleration, microstructured target.

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High-energy proton generation and suppression of transverse proton divergence by localized electrons in a laser-foil interaction

Cited by 25 publications

References 23 publications

Efficient energy conversion from laser to proton beam in a laser-foil interaction

Efficient energy conversion from laser to proton beam in a laser-foil interaction

Controllability of intense-laser ion acceleration

Efficient Production of Proton Beam in Laser-Illuminated Tailored Microstructured Target

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