Observation of annular electron beam transport in multi-TeraWatt laser-solid interactions

Norreys, P.; Green, J.S.; Davies, J. R.; Tatarakis, M.; Clark, Ε. L.; Beg, F. N.; Dangor, A. E.; Lancaster, K. L.; Wei, M. S.; Zepf, Matthew; Krushelnick, K.

doi:10.1088/0741-3335/48/2/l01

Cited by 37 publications

(33 citation statements)

References 41 publications

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“…1(d) indicates a divergence angle of 10 -25 for those energetic electrons (> 10 MeV) contributing to SPR generation. This is consistent with that (typically 10 -30 )of laser-accelerated hot electrons in overdense plasmas and can be attributed to the confinement effect of the selfgenerated magnetic fields [6,7].…”

supporting

confidence: 89%

Tunable Radiation Source by Coupling Laser-Plasma-Generated Electrons to a Periodic Structure

Jin¹,

Zl²,

Zhuo³

et al. 2011

Phys. Rev. Lett.

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This version is available at https://strathprints.strath.ac.uk/44620/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Near-infrared radiation around 1000 nm generated from the interaction of a high-density MeV electron beam, obtained by impinging an intense ultrashort laser pulse on a solid target, with a metal grating is observed experimentally. Theoretical modeling and particle-in-cell simulation suggest that the radiation is caused by the Smith-Purcell mechanism. The results here indicate that tunable terahertz radiation with tens GV=m field strength can be achieved by using appropriate grating parameters.

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supporting

confidence: 89%

Tunable Radiation Source by Coupling Laser-Plasma-Generated Electrons to a Periodic Structure

Jin¹,

Zl²,

Zhuo³

et al. 2011

Phys. Rev. Lett.

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“…Close to the critical layer, the density is highly modulated at the laser wavelength, and at higher densities it is expelled forming a channel. The electron heat flux in the forward direction is shown to exhibit an annular structure, indicating that, due to the tight focus of the laser, most of fast electrons are accelerated at an angle, which is consistent with experimental observations of annular patterns at the back of a solid target after being hit by an ultraintense laser pulse [8]. The plasma electron kinetic energy is maximum at the tip of the laser pulse where considerable electron acceleration occurs.…”

supporting

confidence: 83%

Three-Dimensional Simulations of Laser–Plasma Interactions at Ultrahigh Intensities

Fiúza¹,

Fonseca

Silva³

et al. 2011

IEEE Trans. Plasma Sci.

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Abstract-Three-dimensional (3D) particle-in-cell (PIC) simulations are used to investigate the interaction of ultrahigh intensity lasers (> 10 20 W/cm −2 ) with matter at overcritical densities. Intense laser pulses are shown to penetrate up to relativistic critical density levels and to be strongly self-focused during this process. The heat flux of the accelerated electrons is observed to have an annular structure when the laser is tightly focused, showing that a large fraction of fast electrons is accelerated at an angle. These results shed light into the multi-dimensional effects present in laser-plasma interactions of relevance to fast ignition of fusion targets and laser-driven ion acceleration in plasmas.Index Terms-Intense lasers, fast ignition, plasma-based accelerators, three-dimensional particle-in-cell simulations.T HE interaction of ultraintense laser pulses with matter has opened the way to the exploration of highly nonlinear physical regimes of interest for many applications such as fast ignition of fusion targets [1], [2] or compact plasma based accelerators [3], [4]. In many of these scenarios, the laser frequency is lower than the plasma frequency of the ionized target (overcritical target) and therefore the laser cannot penetrate deep into the plasma, being reflected and/or absorbed.The detailed study of laser absorption is crucial in order to understand the generation of fast electrons in these regimes. However, overcritical targets are difficult to probe experimentally and therefore many experimental results rely on particle-in-cell (PIC) simulations in order to better understand laser absorption and fast electron acceleration. Most of the simulation studies are limited to one-dimensional (1D) [5] and two-dimensional (2D) [6] simulations, due to the need to resolve the fine temporal and spacial scales of plasmas at very high densities.In this paper we present 3D OSIRIS [7] simulations of the interaction of ultraintense laser pulses with overcritical targets in order to study some of the multi-dimensional features of

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“…(10) By the way of substituting expressions (1) and (2), which are obtained for the AM fields in the region R 1 < r < R 2 into the Equation (8), one can drive the following equations for derivatives of radial v j and azimuthal u j components of the impulse for j-th particle of the beam over time (meaning of the index j possess the value from 1 until N ): (12) here R 1j = r j R −1…”

Section: Basic Equationsmentioning

confidence: 99%

“…Solution of the set of equations for amplitude (6) and phase (7) of the AMs envelope, motion equations for the beams' electrons (10)- (12) has been found by the Runge-Kutta method of the fourth order, which is widely used for the research of such problems [1,2,14,15]. Quantity of the beams' macro -particles was assumed to be here N = 2000.…”

Section: But Really It Is a Non-linear Condition Because Expression mentioning

confidence: 99%

“…Results of studying beam-plasma interaction are widely utilized in different branches of plasma physics, e.g., for studying plasma heating in fusion devices [8,9], for studying generation of high power radiation in various plasma electronic devices [10][11][12][13][14][15]. Moreover, the relativistic electron beams are offered to be used even for plasma confinement.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Excitation of Azimuthal Eigen Modes by Modulated Annular Electron Beam

Girka¹,

Puzyrkov²,

Nefodov³

2013

PIER B

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Abstract-Excitation of extraordinarily polarized azimuthal eigen modes by modulated annular electron beam is shown to be characterized by the increase of instability growth rates compared with the case of non-modulated electron beam. Interaction between the modulated beam and azimuthal eigen modes happens in the range of electron cyclotron frequency in waveguides with metal walls, which are partially filled with cold magneto-active plasma. Nonlinear set of differential equations, which describs excitation of these azimuthal modes by an annular electron beam is derived and analyzed numerically. Different scenarios of the beam-plasma interaction depending on relation between azimuthal mode number of the exited waves and periodicity of azimuthal modulation of the beam density, degree and manner of the beams' modulation are studied numerically.

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Observation of annular electron beam transport in multi-TeraWatt laser-solid interactions

Cited by 37 publications

References 41 publications

Tunable Radiation Source by Coupling Laser-Plasma-Generated Electrons to a Periodic Structure

Tunable Radiation Source by Coupling Laser-Plasma-Generated Electrons to a Periodic Structure

Three-Dimensional Simulations of Laser–Plasma Interactions at Ultrahigh Intensities

Excitation of Azimuthal Eigen Modes by Modulated Annular Electron Beam

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