Nonthermal relativistic electron acceleration due to laser-induced incoherent wakefields with external static magnetic fields

Liu, Yao Li; Isayama, Shogo; Chen, Shih Hung; Kuramitsu, Yasuhiro

doi:10.1016/j.hedp.2019.03.004

Cited by 4 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some elec-trons are preferentially accelerated by the wakefield via Landau resonance. Previous laser-plasma experiments (Kuramitsu et al 2011a,b) and simulations (Kuramitsu et al 2008(Kuramitsu et al , 2012Liu et al 2017Liu et al , 2018Liu et al , 2019 showed that the WFA produces a power-law distribution with a spectral index of 2. Therefore, the WFA in the context of relativistic shocks is a promising candidate for UHECR acceleration.…”

Section: Introductionmentioning

confidence: 95%

“…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%

See 1 more Smart Citation

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

Iwamoto

Amano

Hoshino

et al. 2019

ApJL

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 95%

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

View full text Add to dashboard Cite

show abstract

“…Here the background magnetic field does not take into account; the background magnetic field is essential for the precursor excitations however it causes minor effects in the wakefield acceleration. We have numerically investigated the effects of magnetic fields and shown that the power-law spectra with an index of -2 universally produced even in the presence of the background magnetic fields [131] (not shown here).…”

Section: Wakefield Acceleration In Upstream and The Model Experimentsmentioning

confidence: 86%

“…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%

“…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%

See 1 more Smart Citation

Recent progress of laboratory astrophysics with intense lasers

Takabe

Kuramitsu

2021

High Pow Laser Sci Eng

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Iwamoto

Amano

Matsumoto

et al. 2022

ApJ

View full text Add to dashboard Cite

Particle acceleration at magnetized purely perpendicular relativistic shocks in electron–ion plasmas is studied by means of two-dimensional particle-in-cell simulations. Magnetized shocks with the upstream bulk Lorentz factor γ 1 ≫ 1 are known to emit intense electromagnetic waves from the shock front, which induce electrostatic plasma waves (wakefield) and transverse filamentary structures in the upstream region via stimulated/induced Raman scattering and filamentation instability, respectively. The wakefield and filaments inject a fraction of the incoming particles into a particle acceleration process, in which particles are once decoupled from the upstream bulk flow by the wakefield, and are picked up again by the flow. The picked-up particles are accelerated by the motional electric field. The maximum attainable Lorentz factor is estimated as γ max , e ∼ α γ 1 3 for electrons and γ max , i ∼ ( 1 + m e γ 1 / m i ) γ 1 2 for ions, where α ∼ 10 is determined from our simulation results. α can increase up to γ 1 for a weakly magnetized shock if γ 1 is sufficiently large. This result indicates that highly relativistic astrophysical shocks such as external shocks of gamma-ray bursts can be an efficient particle accelerator.

show abstract

Nonthermal relativistic electron acceleration due to laser-induced incoherent wakefields with external static magnetic fields

Cited by 4 publications

References 31 publications

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

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

Recent progress of laboratory astrophysics with intense lasers

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Contact Info

Product

Resources

About