Spot size dependence of laser accelerated protons in thin multi-ion foils

Liu, Tung Chang; Shao, Xi; Liu, Chuan Sheng; Eliasson, Bengt; Wang, Jyhpyng; Chen, Shih Hung

doi:10.1063/1.4882436

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…In order to successfully accelerate the protons by the Coulomb repulsion force, we should both reduce the charge difference between carbon ions and electrons and keep the electrons from returning to the carbon layer so that the net charge of the carbon-electron layer is positive. In our previous works [32,33], we concluded that a higher carbon concentration and smaller spot size can lead to increased proton energy.…”

Section: Introductionmentioning

confidence: 78%

Laser acceleration of protons using multi-ion plasma gaseous targets

et al. 2015

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We present a theoretical and numerical study of a novel acceleration scheme by applying a combination of laser radiation pressure and shielded Coulomb repulsion in laser acceleration of protons in multi-species gaseous targets. By using a circularly polarized CO 2 laser pulse with a wavelength of 10 μm-much greater than that of a Ti: Sapphire laser-the critical density is significantly reduced, and a high-pressure gaseous target can be used to achieve an overdense plasma. This gives us a larger degree of freedom in selecting the target compounds or mixtures, as well as their density and thickness profiles. By impinging such a laser beam on a carbon-hydrogen target, the gaseous target is first compressed and accelerated by radiation pressure until the electron layer disrupts, after which the protons are further accelerated by the electron-shielded carbon ion layer. An 80 MeV quasi-monoenergetic proton beam can be generated using a half-sine shaped laser beam with a peak power of 70 TW and a pulse duration of 150 wave periods.

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Section: Introductionmentioning

confidence: 78%

Laser acceleration of protons using multi-ion plasma gaseous targets

et al. 2015

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“…As a result, it also affects the properties of the beams of particles and radiation generated by those electrons. In the case of beams of ions accelerated by the target normal sheath acceleration (TNSA) mechanism 7 , it has been demonstrated to change the energy spectrum, spatial distribution and laser-to-ion energy conversion efficiency 18 – 23 .…”

Section: Introductionmentioning

confidence: 99%

Influence of spatial-intensity contrast in ultraintense laser–plasma interactions

Wilson

King

Butler

et al. 2022

Sci Rep

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Increasing the intensity to which high power laser pulses are focused has opened up new research possibilities, including promising new approaches to particle acceleration and phenomena such as high field quantum electrodynamics. Whilst the intensity achievable with a laser pulse of a given power can be increased via tighter focusing, the focal spot profile also plays an important role in the interaction physics. Here we show that the spatial-intensity distribution, and specifically the ratio of the intensity in the peak of the laser focal spot to the halo surrounding it, is important in the interaction of ultraintense laser pulses with solid targets. By comparing proton acceleration measurements from foil targets irradiated with by a near-diffraction-limited wavelength scale focal spot and larger F-number focusing, we find that this spatial-intensity contrast parameter strongly influences laser energy coupling to fast electrons. We find that for multi-petawatt pulses, spatial-intensity contrast is potentially as important as temporal-intensity contrast.

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The radiation reaction effects in the ultra-intense and ultra-short laser foil interaction regime

Qiao

2015

Physics of Plasmas

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The extreme laser intensity, IL>1023 W/cm2, will be made possible by Extreme Light Infrastructure. Such an ultra-intense and ultra-short laser pulse promises to promote laser-matter interaction into the exotic quantum-electro-dynamical regime. Electrons quivering in such a strong laser pulse experience a radiation reaction (RR) friction force by radiating high frequency photons. These extreme intensities will also make possible acceleration of heavy ions in new regimes. In this paper, the heavy ion beam generation based on ultra-intense and ultra-short laser foil interaction is systematically studied. Three-dimensional particle-in-cell simulations which include an energy conserving electrodynamics model for RR force and the corresponding γ-photons emission have been used. The energy partition into electrons, ions, and photons has been investigated in relation to efficient generation of heavy ion beams by linearly and circularly polarized (LP and CP) laser and for different foil thicknesses. It is found that the CP and LP cases each have an optimal foil thickness for efficient ion beam generation; the RR force has a stronger effect upon laser coupling to an opaque foil target for an LP laser than a CP laser; and the emitted photons are proven to be an efficient source of γ-ray emission with the peak frequency as high as 106∼108 times the laser frequency.

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Spot size dependence of laser accelerated protons in thin multi-ion foils

Cited by 3 publications

References 32 publications

Laser acceleration of protons using multi-ion plasma gaseous targets

Laser acceleration of protons using multi-ion plasma gaseous targets

Influence of spatial-intensity contrast in ultraintense laser–plasma interactions

The radiation reaction effects in the ultra-intense and ultra-short laser foil interaction regime

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