Collisionless shocks driven by 800 nm laser pulses generate high-energy carbon ions

Zhang, H.; Shen, Baifei; Wang, W. P.; Xu, Yi; Liu, Y. Q.; Liang, Xiaoyan; Leng, Yuxin; Li, R. X.; Yan, Xueqing; Chen, J. E.; Xu, Zhizhan

doi:10.1063/1.4907194

Cited by 24 publications

(10 citation statements)

References 30 publications

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“…Furthermore, recent achievement of mono-energetic proton acceleration by collisionless ES shock produced by ultrahigh-intensity laser system [84][85][86] shows a possibility to apply the collisionless shock to several applications including medical treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Numerical simulation has revealed ion acceleration at a relativistic ES shock generated in an overdense plasma due to reflection of ions in the upstream region by the shock front [75][76][77][78][79][80][81][82][83], and mono-energetic proton acceleration by ES shock has been shown experimentally [84][85][86]. These mono-energetic protons have a potential to be used in several applications including medical treatment [87].…”

Section: Introductionmentioning

confidence: 99%

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Collisionless electrostatic shock generation using high-energy laser systems

Sakawa

Morita

Kuramitsu

et al. 2016

Advances in Physics: X

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Collisionless shock is ubiquitous in space and astrophysical plasmas, and is believed to be a source of cosmic rays. In this review article, historical achievements of three different types of collisionless shocks, i.e. magnetohydrodynamic, electromagnetic, and electrostatic (ES) shocks, in theory/simulation, observation in space and astrophysical plasmas, and laboratory experiments are shown. An overview is given on recent progress of collisionless ES shock experiments using high-energy laser systems for two schemes. One is an interaction between laser-produced highdensity ablating plasma and a low-density ambient plasma, and the other is an interaction between laser-ablated counterstreaming plasmas using double-plane target. For the former scheme, detailed measurements of structures of collisionless ES shock and ion-acoustic soliton, and the transition from double-layer to collisionless ES shock are conducted by proton radiography. For the latter scheme, optical diagnostics are used to observe global structures of plasmas and shocks; collective laser Thomson scattering method is applied to clarify local plasma parameters, such as electron and ion temperatures, flow velocity, and electron density; and proton radiography is employed to measure a shock electric field. The measured large density-jump, steepening of self-emission profile, plasma parameters in the upand down-stream regions of a shock, and the narrow width of the shock electric field compared with the ion-ion Coulomb meanfree-path reveal the evidence for the formation of collisionless ES shock. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Collisionless electrostatic shock generation using high-energy laser systems

Sakawa

Morita

Kuramitsu

et al. 2016

Advances in Physics: X

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“…Previously, we suggested using the relativistic transparency for shock generation by circularly polarized (CP) pulses [21], where hot-electron recirculation is not available. Regarding the effects of transmittance on shock formation, there have been seemingly contradictory results; Zhang et al could obtain a quasimonoenergetic carbon beam of ∼7.5 MeV from an * mshur@unist.ac.kr opaque plasma irradiated by an LP pulse but could not do so in transparent plasma [22]. Meanwhile, Lecz et al observed that shock ion acceleration was more efficient in semitransparent plasmas with 20-30% transmittance [23].…”

Section: Introductionmentioning

confidence: 97%

Effects of laser polarizations on shock generation and shock ion acceleration in overdense plasmas

et al. 2016

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The effects of laser-pulse polarization on the generation of an electrostatic shock in an overdense plasma were investigated using particle-in-cell simulations. We found, from one-dimensional simulations, that total and average energies of reflected ions from a circular polarization-(CP) driven shock front are a few times higher than those from a linear polarization-(LP) driven one for a given pulse energy. Moreover, it was discovered that the pulse transmittance is the single dominant factor for determining the CP-shock formation, while the LP shock is affected by the plasma scale length as well as the transmittance. In two-dimensional simulations, it is observed that the transverse instability, such as Weibel-like instability, can be suppressed more efficiently by CP pulses.

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“…Consequently the circularly polarized pulse can be more efficient than the linear one in shock ion acceleration under the limited pulse energy. In our scheme, controlled prepulse energy and duration are utilized for target explosion [30]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

“…Recently it was suggested to use an electrostatic shock [23][24][25][26][27][28][29][30] for ion acceleration, where a laser pulse with moderate power and a near-critical target are used. In this system, a stable electrostatic shock with a high Mach number (>1.5) is formed in a similar way as in Ref.…”

Section: Introductionmentioning

confidence: 99%

Shock ion acceleration by an ultrashort circularly polarized laser pulse via relativistic transparency in an exploded target

et al. 2015

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We investigated ion acceleration by an electrostatic shock in an exploded target irradiated by an ultrashort, circularly polarized laser pulse by means of one-and three-dimensional particle-in-cell simulations. We discovered that the laser field penetrating via relativistic transparency (RT) rapidly heated the upstream electron plasma to enable the formation of a high-speed electrostatic shock. Owing to the RT-based rapid heating and the fast compression of the initial density spike by a circularly polarized pulse, a new regime of the shock ion acceleration driven by an ultrashort (20-40 fs), moderately intense (1-1.4 PW) laser pulse is envisaged. This regime enables more efficient shock ion acceleration under a limited total pulse energy than a linearly polarized pulse with crystal laser systems of λ ∼ 1 μm.

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Collisionless shocks driven by 800 nm laser pulses generate high-energy carbon ions

Cited by 24 publications

References 30 publications

Collisionless electrostatic shock generation using high-energy laser systems

Collisionless electrostatic shock generation using high-energy laser systems

Effects of laser polarizations on shock generation and shock ion acceleration in overdense plasmas

Shock ion acceleration by an ultrashort circularly polarized laser pulse via relativistic transparency in an exploded target

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