On the universality of nonthermal electron acceleration due to quasi-turbulent wakefields

Kuramitsu, Yasuhiro; Sakawa, Y.; Hoshino, Masahiro; Chen, Shih Hung; Takabe, H.

doi:10.1016/j.hedp.2012.03.016

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…The prime indicates physical quantities measured in the plasma rest frame. Note that we use the proper frame for comparison with the previous simulation results and laser experiments (Kuramitsu et al 2011a(Kuramitsu et al ,b, 2008(Kuramitsu et al , 2012Liu et al 2017Liu et al , 2018Liu et al , 2019 where the spectra were measured in the plasma rest frame. We determined the bulk velocity in the turbulent-wakefield region and then the spectra are obtained by performing Lorentz transformation into the plasma rest frame.…”

Section: Precursor Wave Amplificationmentioning

confidence: 99%

Precursor Wave Amplification by Ion–Electron Coupling through Wakefield in Relativistic Shocks

Iwamoto

Amano

Hoshino

et al. 2019

ApJL

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We investigated electromagnetic precursor wave emission in relativistic shocks by using twodimensional particle-in-cell simulations. We found that the wave amplitude is significantly enhanced by a positive feedback process associated with ion-electron coupling through the wakefields for high magnetization. The wakefields collapse during the nonlinear process of the parametric decay instability in the near-upstream region, where nonthermal electrons and ions are generated. The intense coherent emission and the particle acceleration may opperate in high-energy astrophysical objects.

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Section: Precursor Wave Amplificationmentioning

confidence: 99%

Precursor Wave Amplification by Ion–Electron Coupling through Wakefield in Relativistic Shocks

Iwamoto

Amano

Hoshino

et al. 2019

ApJL

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“…Above 1.-Figure 40. Electron energy distribution functions show power-law spectra with and index of -2 independent of (a) the normalized vector potential, (b) frequency ratio between plasma and laser frequency, and (c) the pulse shape [129] . 3.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Figure 38 shows the energy spectra of electrons evaluated at the upstream rest frame to compare with our upstream model in numerical computations and in laboratory experiments [120,[129][130][131][132][133]135] . It is clearly shown that the nonthermal electron and ion acceleration (except for ions with σ e = 0.1) and the spectra are well represented with a power law with an index of -2, consistent with our numerical and experimental results also shown in the following.…”

Section: Wakefield Generation and Acceleration In Relativistic Collisionless Shocksmentioning

confidence: 99%

“…As mentioned in the introduction, a power law with an index of -2 is significant in astrophysics, because the index of cosmic-ray spectra is considered to be -2 and the DSA explains this well independently of plasma and shock parameters as long as the shock is strong. The universality of the wakefield acceleration has been investigated analytically and numerically in various conditions [120,[129][130][131]135] . Figure 40 shows the energy distribution functions of electrons by changing the two governing parameters in astrophysical conditions as well as the pulse shape, which is also a governing parameter in the laboratory wakefield acceleration [120] .…”

Section: Wakefield Acceleration In Upstream and The Model Experimentsmentioning

confidence: 99%

“…Iwamoto et al extended the one-dimensional model to two dimensions to address the multidimensionality of the precursor wave propagations [57,124,125] . By focusing on the wakefield acceleration upstream, we have shown the universality of the power-law acceleration by a turbulent wakefield with two-dimensional PIC simulations [120,[129][130][131] . Most of the acceleration models mentioned previously can account for the origin of UHECRs with energies of approximately 10 20 eV or more.…”

Section: Introductionmentioning

confidence: 99%

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Recent progress of laboratory astrophysics with intense lasers

Takabe

Kuramitsu

2021

High Pow Laser Sci Eng

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Thanks to a rapid progress of high-power lasers soon after the birth of laser by T. H. Maiman in 1960, intense lasers have been developed mainly for studying scientific feasibility of the laser fusion in the world wide. Inertial confinement fusion with intense laser has attracted attention as a new future energy after two oil crises from 1970s -1980s. From the beginning, the most challenging physics is known to be the hydrodynamic instability to realize the spherical implosion to achieve more than 1000 times the solid density. A lot of studies have been carried out theoretically and experimentally on the hydrodynamic instability and resultant turbulent mixing of compressible fluids. During such activities in laboratory, the explosion of supernova SN1987A was observed in the sky on February 23, 1987. The x-ray satellites have revealed that the hydrodynamic instability is a key issue to understand the physics of supernova explosion. After strong interaction of laser plasma researchers and astrophysicists, the laboratory astrophysics with intense lasers has been proposed and promoted around the end of 1990s. The original subject was mainly related to hydrodynamic instabilities. However, after two decades of the laboratory astrophysics research, we can now find a diversity of its research topics. It has been demonstrated that a variety of nonlinear physics of collisionless plasmas can be studied in laser ablation plasmas in the last decade theoretically and experimentally. In the present paper, we shed light on the recent ten topics intensively studied in laboratory experiments. Brief review is given by citing recent papers. Then, modeling cosmic-ray acceleration with lasers is reviewed in a following session as a special topic to be the coming main topics in laboratory astrophysics research.

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