scholarly journals Simulation study of wake field excitation in interaction of intense laser and magnetized plasma: Half-sine pulse shape (HSPS) and trapezoid pulse shape (TPS)

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Amir Rahimian ◽  
Hossien Zahed
Keyword(s):  
Magnetic Field ◽  
Electric Fields ◽  
Pulse Shape ◽  
Laser Wavelength ◽  
Magnetized Plasma ◽  
Intense Laser ◽  
Plasma Parameters ◽  
Particle In Cell ◽  
Wake Field ◽  
Field Excitation

We have conducted particle-in-cell (PIC) simulations of a linearly polarized intensive laser pulse with two different envelopes propagating through a homogeneous fully ionized cold plasma. It is shown that the amplitude of the wake field depends on laser wavelength, pulse duration, electron number density and envelope shape. We have also simulated the effect of applying a longitudinal magnetic field on the wake field excitation process. It is observed that magnetic field enhances the wake field and increases its intensity in all cases. Our results are in agreement with the analytical results presented by Askari and Shahidani [Opt. Laser Technol.45, 613–619 (2013)] and can help choosing the optimum values of affecting laser and plasma parameters in order to reach high accelerating wake electric fields.

scholarly journals Lepton-driven Nonresonant Streaming Instability

2021 ◽  
Vol 923 (2) ◽  
pp. 208
Author(s):  
Siddhartha Gupta ◽  
Damiano Caprioli ◽  
Colby C. Haggerty
Keyword(s):  
Magnetic Field ◽  
Laboratory Experiments ◽  
Magnetized Plasma ◽  
Ion Current ◽  
Pulsar Wind Nebulae ◽  
Particle In Cell ◽  
Streaming Instability ◽  
Electrons And Positrons ◽  
Pulsar Wind ◽  
The Magnetic Field

Abstract A strong super-Alfvénic drift of energetic particles (or cosmic rays) in a magnetized plasma can amplify the magnetic field significantly through nonresonant streaming instability (NRSI). While the traditional analysis is done for an ion current, here we use kinetic particle-in-cell simulations to study how the NRSI behaves when it is driven by electrons or by a mixture of electrons and positrons. In particular, we characterize the growth rate, spectrum, and helicity of the unstable modes, as well the level of the magnetic field at saturation. Our results are potentially relevant for several space/astrophysical environments (e.g., electron strahl in the solar wind, at oblique nonrelativistic shocks, around pulsar wind nebulae), and also in laboratory experiments.

scholarly journals High-resolution sampling of beam-driven plasma wakefields

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Schröder ◽  
C. A. Lindstrøm ◽  
S. Bohlen ◽  
G. Boyle ◽  
R. D’Arcy ◽  
...  
Keyword(s):  
Electric Fields ◽  
High Energy ◽  
Acceleration Process ◽  
Plasma Parameters ◽  
Particle Beams ◽  
Particle In Cell ◽  
Precise Control ◽  
Plasma Wakefield Accelerators ◽  
Plasma Wakefield ◽  
Good Agreement

AbstractPlasma-wakefield accelerators driven by intense particle beams promise to significantly reduce the size of future high-energy facilities. Such applications require particle beams with a well-controlled energy spectrum, which necessitates detailed tailoring of the plasma wakefield. Precise measurements of the effective wakefield structure are therefore essential for optimising the acceleration process. Here we propose and demonstrate such a measurement technique that enables femtosecond-level (15 fs) sampling of longitudinal electric fields of order gigavolts-per-meter (0.8 GV m−1). This method—based on energy collimation of the incoming bunch—made it possible to investigate the effect of beam and plasma parameters on the beam-loaded longitudinally integrated plasma wakefield, showing good agreement with particle-in-cell simulations. These results open the door to high-quality operation of future plasma accelerators through precise control of the acceleration process.

scholarly journals Plasma wake-field excitation by relativistic electron bunches and charged particle acceleration in the presence of external magnetic field

2001 ◽  
Vol 19 (4) ◽  
pp. 597-604 ◽  
Author(s):  
V.A. BALAKIREV ◽  
V.I. KARAS' ◽  
I.V. KARAS' ◽  
V.D. LEVCHENKO
Keyword(s):  
Magnetic Field ◽  
Relativistic Electron ◽  
Magnetoactive Plasma ◽  
High Amplitude ◽  
Plasma Dynamics ◽  
Wake Field ◽  
Electron Bunches ◽  
Plasma Bunch ◽  
Field Excitation ◽  
Wake Fields

High-amplitude plasma wake waves are excited by high-density relativistic electron bunches (REB) moving in a plasma. The wake-fields can be used to accelerate charged particles, to serve as electrostatic wigglers in plasma free-electron lasers (FEL), and also can find many other applications. The electromagnetic fields in the region occupied by the bunch control the dynamics of the bunch itself. This paper presents the results of 2.5-dimensional numerical simulation of the modulation of a long REB in a plasma, the excitation of wake-fields by bunches in a plasma, in particular, in magnetoactive plasma. The previous one-dimensional study has shown that the density-profile modulation of a long bunch moving in plasma results in the growth of the coherent wake-wave amplitude. The bunch modulation occurs at the plasma frequency. The present study is concerned with the REB motion, taking into account the plasma and REB nonlinearities. It is demonstrated that the nonlinear REB/plasma dynamics exerts primary effect on both the REB self-modulation and the wake-field excitation by the bunches formed. We have demonstrated that a multiple excess of the accelerated bunch energy εmax over the energy of the exciting REB is possible in a magnetoactive plasma for a certain relationship between the parameters of the “plasma–bunch–magnetic field” system (owing to a hybrid volume–surface character of REB-excited wake-fields).

scholarly journals Harmonic generation in the interaction of laser with a magnetized overdense plasma

2021 ◽  
Vol 87 (5) ◽  
Author(s):  
Srimanta Maity ◽  
Devshree Mandal ◽  
Ayushi Vashistha ◽  
Laxman Prasad Goswami ◽  
Amita Das
Keyword(s):  
Magnetic Field ◽  
Harmonic Generation ◽  
Laser Energy ◽  
Magnetized Plasma ◽  
Plasma Region ◽  
Particle In Cell ◽  
Incident Laser Intensity ◽  
Overdense Plasma ◽  
The Magnetic Field

The mechanism of harmonic generation in both O- and X-mode configurations for a magnetized plasma has been explored here in detail with the help of particle-in-cell simulations. A detailed characterization of both the reflected and transmitted electromagnetic radiation propagating in the bulk of the plasma has been carried out for this purpose. The efficiency of harmonic generation is shown to increase with the incident laser intensity. A dependency of harmonic efficiency has also been found on magnetic field strength. This work demonstrates that there is an optimum value of the magnetic field at which the efficiency of harmonic generation maximizes. The observations are in agreement with theoretical analysis. For the O-mode configuration, this is compelling as the harmonic generation provides for a mechanism by which laser energy can propagate inside an overdense plasma region.

scholarly journals Magnetic Field Amplification Driven by the Gyro Motion of Charged Particles

2021 ◽  
Author(s):  
Yan-Jun Gu ◽  
Masakatsu Murakami
Keyword(s):  
Magnetic Field ◽  
Spot Size ◽  
Opposite Polarity ◽  
Laser Wavelength ◽  
Intense Laser ◽  
Magnetic Field Generation ◽  
Plasma Dynamics ◽  
Static Magnetic Fields ◽  
Laser Plasma Interactions ◽  
Field Amplification

Abstract Spontaneous magnetic field generation plays important role in laser-plasma interactions. Strong quasi-static magnetic fields affect the thermal conductivity and the plasma dynamics, particularly in the case of ultra intense laser where the magnetic part of Lorentz force becomes as significant as the electric part. Kinetic simulations of giga-gauss magnetic field amplification via a laser irradiated microtube structure reveal the dynamics of charged particle implosions and the mechanism of magnetic field growth. A giga-gauss magnetic field is generated and amplified with the opposite polarity to the seed magnetic field. The spot size of the field is comparable to the laser wavelength, and the lifetime is hundreds of femtoseconds. An analytical model is presented to explain the underlying physics. This study should aid in designing future experiments.

Electron beam-plasma discharge in GDT mirror trap: Particle-in-cell simulations

2021 ◽  
Author(s):  
Igor Timofeev ◽  
Vladimir Annenkov ◽  
Evgeniia Volchok ◽  
Vladimir Glinskiy
Keyword(s):  
Electron Beam ◽  
Electric Fields ◽  
Plasma Discharge ◽  
Magnetized Plasma ◽  
Beam Particle ◽  
Nonuniform Plasma ◽  
Particle In Cell ◽  
Beam Plasma ◽  
Transverse Electric Fields ◽  
Recent Laboratory

Abstract The paper presents the results of numerical simulations of the collective relaxation of an electron beam in a magnetized plasma at the parameters typical to experiments on the ignition of a beam-plasma discharge in the Gas Dynamic Trap. The goal of these simulations is to confirm the ideas about the mechanism of the discharge development, which are used to interpret the results of recent laboratory experiments [Soldatkina et al 2021 {\it Nucl. Fusion}]. In particular, a characteristic feature of these experiments is the localization of the beam relaxation region in the vicinity of the entrance mirror. A strong mirror magnetic field compresses the beam so that its transverse size becomes less than the wavelength it excites. In addition, near the mirror, the electron cyclotron frequency is much higher than the plasma one, which can significantly affect the possibility of propagation of the most unstable waves outside the beam. Particle-in-cell simulations make it possible not only to find how efficiently intense plasma oscillations penetrate the rarefied periphery, but also to prove that the turbulent zone in a realistic nonuniform plasma has regions dominated by transverse electric fields. This creates the necessary conditions for efficient acceleration of the trapped particles to energies much higher than the initial beam energy.

On the excitation of higher harmonic electrostatic dust cyclotron waves

2013 ◽  
Vol 79 (5) ◽  
pp. 721-726
Author(s):  
M. ROSENBERG
Keyword(s):  
Magnetic Field ◽  
Magnetized Plasma ◽  
Wave Number ◽  
Charged Dust ◽  
Plasma Parameters ◽  
Coulomb Collisions ◽  
Plasma Device ◽  
Higher Harmonic ◽  
Parameter Ranges ◽  
The Magnetic Field

AbstractIn a magnetized plasma containing charged dust whose motion is magnetized, one of the fundamental collective modes that could occur is the electrostatic dust cyclotron (EDC) wave with frequency near the dust cyclotron frequency. The EDC wave propagates nearly perpendicular to the magnetic field with a small parallel wave number, so that it can be driven unstable by ion flow along the magnetic field. Because unstable parallel wavelengths can be relatively large, this places constraints on the plasma device size. In this paper, we use linear kinetic theory to investigate the excitation of higher harmonic EDC waves that have wavelengths smaller than that of the fundamental mode. Collisions of charged particles with neutrals and Coulomb collisions including dust–dust collisions are taken into account. Constraints on possible parameter ranges arising from collisional effects or from requiring stability of other waves are discussed. Numerical results are presented for possible sets of laboratory dusty plasma parameters.

scholarly journals Generation of strong magnetic fields from laser interaction with two-layer targets

2009 ◽  
Vol 27 (3) ◽  
pp. 471-474 ◽  
Author(s):  
S.Z. Wu ◽  
C.T. Zhou ◽  
X.T. He ◽  
S.-P. Zhu
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Laser Intensity ◽  
Intense Laser ◽  
Two Dimensional ◽  
Laser Interaction ◽  
Strong Magnetic Fields ◽  
Particle In Cell ◽  
Cell Simulation ◽  
The Magnetic Field

AbstractA two-layer target irradiated by an intense laser to generate strong interface magnetic field is proposed. The mechanism is analyzed through a simply physical model and investigated by two-dimensional particle-in-cell simulation. The effect of laser intensity on the resulting magnetic field strength is also studied. It is found that the magnetic field can reach up to several ten megagauss for laser intensity at 1019 Wcm−2.

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