Relativistic plasma astrophysics with intense lasers

Kuramitsu, Yasuhiro; Chu, H.-H.; Hau, L.‐N.; Chen, Shih Hung; Liu, Yao Li; Hsieh, Ching-Liang; Sakawa, Y.; Takabe, H.; Wang, Jyhpyng

doi:10.1016/j.hedp.2014.11.005

Cited by 16 publications

(7 citation statements)

References 38 publications

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“…The 3D reconnection rate can be observed using multi-channel CTS measurements or electric/magnetic field measurements at the reconnection region with proton radiography 4,5,8 . Moreover, the experiment can be extended to relativistic regime using ultraintense laser pulses 42,43 and turbulent regime using multiple beams 44,45 . Laboratory experiments will contribute further understanding the magnetic reconnections.…”

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confidence: 99%

Direct observations of pure electron outflow in magnetic reconnection

Sakai

Moritaka

Morita

et al. 2022

Sci Rep

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Magnetic reconnection is a universal process in space, astrophysical, and laboratory plasmas. It alters magnetic field topology and results in energy release to the plasma. Here we report the experimental results of a pure electron outflow in magnetic reconnection, which is not accompanied with ion flows. By controlling an applied magnetic field in a laser produced plasma, we have constructed an experiment that magnetizes the electrons but not the ions. This allows us to isolate the electron dynamics from the ions. Collective Thomson scattering measurements reveal the electron Alfvénic outflow without ion outflow. The resultant plasmoid and whistler waves are observed with the magnetic induction probe measurements. We observe the unique features of electron-scale magnetic reconnection simultaneously in laser produced plasmas, including global structures, local plasma parameters, magnetic field, and waves.

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confidence: 99%

Direct observations of pure electron outflow in magnetic reconnection

Sakai

Moritaka

Morita

et al. 2022

Sci Rep

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“…This can be a turbulent magnetic field. Recent PIC simulations in electron scale show magnetic field generation from the null field due to KHI (Alves et al 2012).If the KHI driven magnetic field can survive in ion scale, it is interesting to investigate this as an origin of magnetic field in the universe (Kuramitsu et al 2015).…”

Section: Discussion and Summarymentioning

confidence: 99%

Time Evolution of Kelvin–helmholtz Vortices Associated With Collisionless Shocks in Laser-Produced Plasmas

Kuramitsu

Mizuta

Sakawa

et al. 2016

ApJ

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We report experimental results on Kelvin-Helmholtz (KH) instability and resultant vortices in laser-produced plasmas. By irradiating a double plane target with a laser beam, asymmetric counterstreaming plasmas are created. The interaction of the plasmas with different velocities and densities results in the formation of asymmetric shocks, where the shear flow exists along the contact surface and the KH instability is excited. We observe the spatial and temporal evolution of plasmas and shocks with time-resolved diagnostics over several shots. Our results clearly show the evolution of transverse fluctuations, wavelike structures, and circular features, which are interpreted as the KH instability and resultant vortices. The relevant numerical simulations demonstrate the time evolution of KH vortices and show qualitative agreement with experimental results. Shocks, and thus the contact surfaces, are ubiquitous in the universe; our experimental results show general consequences where two plasmas interact.

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“…We have developed large-area suspended graphene (LSG) for proton radiography intended to use laboratory astrophysics experiments with a relatively small laser facility, where no plasma mirror is equipped 14 , 15 . In such small laser facilities, the radiations from the laser matter interactions by shooting m thick solid targets would be a serious problem.…”

Section: Introductionmentioning

confidence: 99%

Robustness of large-area suspended graphene under interaction with intense laser

Kuramitsu

Minami

Hihara

et al. 2022

Sci Rep

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Graphene is known as an atomically thin, transparent, highly electrically and thermally conductive, light-weight, and the strongest 2D material. We investigate disruptive application of graphene as a target of laser-driven ion acceleration. We develop large-area suspended graphene (LSG) and by transferring graphene layer by layer we control the thickness with precision down to a single atomic layer. Direct irradiations of the LSG targets generate MeV protons and carbons from sub-relativistic to relativistic laser intensities from low contrast to high contrast conditions without plasma mirror, evidently showing the durability of graphene.

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Relativistic plasma astrophysics with intense lasers

Cited by 16 publications

References 38 publications

Direct observations of pure electron outflow in magnetic reconnection

Direct observations of pure electron outflow in magnetic reconnection

Time Evolution of Kelvin–helmholtz Vortices Associated With Collisionless Shocks in Laser-Produced Plasmas

Robustness of large-area suspended graphene under interaction with intense laser

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