Laboratory study of astrophysical collisionless shock at SG-II laser facility

Yuan, Dawei; Wei, Huigang; Liang, G. Y.; Wang, Feilu; Li, Yutong; Zhang, Zhe; Zhu, Baojun; Zhao, Jiarui; Jiang, Weiman; Han, Bo; Yuan, Xunhui; Zhong, Jiayong; Yuan, Xiaohui; Fu, Changbo; Zhang, Xiaopeng; Wang, Chen; Guo, Jia; Xiong, Jie; Fang, Zhiheng; Jiang, Shaoen; Du, Keming; Ding, Yongkun; Hua, Neng; Qiao, Zhongliang; Zhou, Shenlei; Zhu, Bin; Zhu, Jianqiang; Zhao, Gang; Zhang, Jie

doi:10.1017/hpl.2018.40

Cited by 7 publications

(6 citation statements)

References 37 publications

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“…This setup has yielded promising results at the Omega Laser Facility [19][20][21] and the National Ignition Facility (NIF), 22,23 as well as at many other laser facilities all over the world. [24][25][26] Recently, experiments on collisionless shocks in plasma flows in which there was a significant self-generated magnetic field showed, for the first time, the formation of magnetized collisionless shocks, with the generation of Weibel instability and observation of electron acceleration in the turbulent structure. 27 Most recently, the dynamics of the ion Weibel instability have been characterized by local quantitative measurements of ion current filamentation and magnetic field amplification in interpenetrating plasmas via optical Thomson scattering (TS).…”

Section: Introductionmentioning

confidence: 99%

Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

Yao

Fazzini

Chen

et al. 2021

Matter and Radiation at Extremes

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Collisionless shocks are ubiquitous in the Universe and are held responsible for the production of nonthermal particles and high-energy radiation. In the absence of particle collisions in the system, theory shows that the interaction of an expanding plasma with a pre-existing electromagnetic structure (as in our case) is able to induce energy dissipation and allow shock formation. Shock formation can alternatively take place when two plasmas interact, through microscopic instabilities inducing electromagnetic fields that are able in turn to mediate energy dissipation and shock formation. Using our platform in which we couple a rapidly expanding plasma induced by high-power lasers (JLF/ Titan at LLNL and LULI2000) with high-strength magnetic fields, we have investigated the generation of a magnetized collisionless shock and the associated particle energization. We have characterized the shock as being collisionless and supercritical. We report here on measurements of the plasma density and temperature, the electromagnetic field structures, and the particle energization in the experiments, under various conditions of ambient plasma and magnetic field. We have also modeled the formation of the shocks using macroscopic hydrodynamic simulations and the associated particle acceleration using kinetic particle-in-cell simulations. As a companion paper to Yao et al. [Nat. Phys. 17, 1177-1182(2021], here we show additional results of the experiments and simulations, providing more information to allow their reproduction and to demonstrate the robustness of our interpretation of the proton energization mechanism as being shock surfing acceleration.

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Section: Introductionmentioning

confidence: 99%

Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

Yao

Fazzini

Chen

et al. 2021

Matter and Radiation at Extremes

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“…In this paper, we present the new petawatt-based laser wakefield acceleration facility. We also present in detail an online plasma density diagnostic employing the Nomarski interferometry [28][29][30][31][32][33][34] and show its importance toward the generation of LWFA electron beams.…”

Section: Articlementioning

confidence: 99%

A laser wakefield acceleration facility using SG-II petawatt laser system

Liang

et al. 2022

Review of Scientific Instruments

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Laser wakefield acceleration (LWFA) using PW-class laser pulses generally requires cm-scale laser–plasma interaction Rayleigh length, which can be realized by focusing such pulses inside a long underdense plasma with a large f-number focusing optic. Here, we present a new PW-based LWFA instrument at the SG-II 5 PW laser facility, which employs f/23 focusing. The setup also adapted an online probing of the plasma density via Nomarski interferometry using a probe laser beam having 30 fs pulse duration. By focusing 1-PW, 30-fs laser pulses down to a focal spot of 230 µm, the peak laser intensity reached a mild-relativistic level of 2.6 × 1018 W/cm2, a level modest for standard LWFA experiments. Despite the large aspect ratio of >25:1 (transverse to longitudinal dimensions) of the laser pulse, electron beams were observed in our experiment only when the laser pulse experienced relativistic self-focusing at high gas-pressure thresholds, corresponding to plasma densities higher than 3 × 1018 cm−3.

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“…It is di cult to take a direct observation of astrophysical parameters in extreme celestial events limited by the current technology. The acceleration process of high-energy charged particles based on relativistic laser plasma interactions has been studied, which provides a superhigh acceleration gradient 7 . Kuramitsu et al reported the simulation of a large-size relativistic laser-induced incoherent wake eld in low-density plasma.…”

Section: Introductionmentioning

confidence: 99%

Ultraintense Laser-Driven Nonthermal Acceleration of Charged Particles in the Near-QED Regime

Shen

et al. 2021

Preprint

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Here, we have studied the nonthermal acceleration of energetic electrons/protons under the near-QED regime by extending the laser intensity beyond 1023 W/cm2 based on a two-dimensional particle-in-cell simulation. The radiation-reaction (RR) effect plays a critical role and brings a quantum stochastic effect to the charged-particle acceleration process. Background electrons in plasma are accelerated in an intense laser field to several GeVs with strong oscillations and thus radiate γ-ray photons. The emitting γ-photons have a broad energy spectrum with maximal energy up to 3 GeV and result in radiation-reaction trapping of the electrons, forming a relativistic plasma bunch in the plasma channel. The accumulation of electrons and protons produces a charge-separation field for the acceleration/deceleration of charged particles. The accelerated electrons have a nonthermal spectrum with a power-law index of 1.5 with a laser intensity 1023 W/cm2 lower than that in the non-QED regime. As the laser intensity further increases over 1024 W/cm2, the power-law index further drops to 1.2. Moreover, the energy spectrum of accelerated protons has a nonthermal distribution with a power-law index of 0.7, which is much lower than that of electrons in the near-QED regime.

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Laboratory study of astrophysical collisionless shock at SG-II laser facility

Cited by 7 publications

References 37 publications

Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

Detailed characterization of a laboratory magnetized supercritical collisionless shock and of the associated proton energization

A laser wakefield acceleration facility using SG-II petawatt laser system

Ultraintense Laser-Driven Nonthermal Acceleration of Charged Particles in the Near-QED Regime

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