A5072367883- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Laser Design and Applications
- Ionosphere and magnetosphere dynamics
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Orbital Angular Momentum in Optics
- Dust and Plasma Wave Phenomena
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Quantum optics and atomic interactions
- Laser Material Processing Techniques
- Atomic and Molecular Physics
- Advanced X-ray Imaging Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Random lasers and scattering media
- Advanced Optical Sensing Technologies
- Seismic Waves and Analysis
- Planetary Science and Exploration
Rutherford Appleton Laboratory
2014-2024
Science and Technology Facilities Council
2023-2024
Plasma (Russia)
2021
Central Laser Facility
2020
Lancaster University
2010-2016
European Organization for Nuclear Research
2016
Research Complex at Harwell
2009
University of Strathclyde
2008
Ruhr University Bochum
2008
Applied BioPhysics (United States)
2008
In the 2015 review paper ‘Petawatt Class Lasers Worldwide’ a comprehensive overview of current status high-power facilities ${>}200~\text{TW}$ was presented. This largely based on facility specifications, with some description their uses, for instance in fundamental ultra-high-intensity interactions, secondary source generation, and inertial confinement fusion (ICF). With 2018 Nobel Prize Physics being awarded to Professors Donna Strickland Gerard Mourou development technique chirped...
Abstract Twisted Laguerre–Gaussian lasers, with orbital angular momentum and characterized by doughnut-shaped intensity profiles, provide a transformative set of tools research directions in growing range fields applications, from super-resolution microcopy ultra-fast optical communications to quantum computing astrophysics. The impact twisted light is widening as recent numerical calculations provided solutions long-standing challenges plasma-based acceleration allowing for high-gradient...
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
Abstract Relativistic electron-positron plasmas are ubiquitous in extreme astrophysical environments such as black-hole and neutron-star magnetospheres, where accretion-powered jets pulsar winds expected to be enriched with pairs. Their role the dynamics of is many cases believed fundamental, but their behavior differs significantly from typical electron-ion due matter-antimatter symmetry charged components. So far, our experimental inability produce large yields positrons quasi-neutral...
The twin-spacecraft STEREO mission has enabled simultaneous white-light imaging of the solar corona and inner heliosphere from multiple vantage points. This led to development numerous stereoscopic techniques investigate three-dimensional structure kinematics wind transients such as coronal mass ejections (CMEs). Two methods—triangulation tangent a sphere—can be used determine time profiles propagation direction radial distance (and thereby speed) transient it travels through heliosphere,...
We present a new magnetic field generation mechanism in underdense plasmas driven by the beating of two, co-propagating, Laguerre-Gaussian (LG) orbital angular momentum (OAM) laser pulses with different frequencies and also twist indices. The resulting twisted ponderomotive force drives up an electron plasma wave helical rotating structure. To second order, there is nonlinear current leading to onset intense, static axial field, which persists over long time (ps scale) after have passed by....
We identify and explore a high orbital angular momentum (OAM) harmonics generation amplification mechanism that manipulates the OAM independently of any other laser property, by preserving initial wavelength, through stimulated Raman backscattering in plasma. The spectra can extend at least up to limiting value imposed paraxial approximation. show with theory particle-in-cell simulations orders be tuned according selection rule depends on interacting waves. illustrate plasma using several...
Abstract MeV temperature electrons are typically generated at laser intensities of 10 18 W cm −2 . Their generation non-relativistic (~10 16 ) with high repetition rate lasers is cardinal for the realization compact, ultra-fast electron sources. Here we report a technique dynamic target structuring micro-droplets using 1 kHz, 25 fs, millijoule class laser, that uses two collinear pulses; first to create concave surface in liquid drop and second, dynamically-drive electrostatic plasma waves...
Photon acceleration is the phenomenon whereby a light wave changes color when propagating through medium whose index of refraction in time. This concept can be used to describe spectral experienced by electromagnetic waves they propagate spatially and temporally varying plasmas. In this paper detection large-amplitude laser-driven wake field reported for first time, demonstrating photon acceleration. Several features characteristic fields, such as splitting main peak asymmetries between...
Raman amplification in plasma has been promoted as a means of compressing picosecond optical laser pulses to femtosecond duration explore the intensity frontier. Here we show for first time that it can be used, with equal success, compress from nanosecond duration. Simulations up 60% energy transfer pump pulse probe pulse, implying multikilojoule ultraviolet petawatt produced using this scheme. This important consequences demonstration fast-ignition inertial confinement fusion.
A review is presented here of a number invited papers at the 2008 American Physical Society April meeting [held jointly with High Energy Density Physics/High Laboratory Astrophysics (HEDP/HEDLA) Conference] devoted to intense laser-matter interactions. They include new insights gained from wave-kinetic theory into laser-wakefield accelerators and drift wave turbulence interacting zonal flows in magnetized plasmas; interactions cluster media for generation radiative blast waves; fast electron...
Shadowgraphy is a technique widely used to diagnose objects or systems in various fields physics and engineering. In shadowgraphy, an optical beam deflected by the object then intensity modulation captured on screen placed some distance away. However, retrieving quantitative information from shadowgrams themselves challenging task because of nonlinear nature process. Here, we present method retrieve shadowgrams, based computational geometry. This process can also be applied proton...
ABSTRACT Investigation of the lunar crustal magnetic anomalies offers a comprehensive long-term data set observations small-scale fields and their interaction with solar wind. In this paper review mini-magnetospheres is compared quantifiably theoretical kinetic-scale plasma physics 3D particle-in-cell simulations. The aim to provide complete picture all aspects phenomena show how from different international missions interrelate. analysis shows that simulations are consistent formation...
Spontaneous formation of solitary wave structures has been observed in Earth's magnetopause, and is shown to be caused by the breakup a zonal flow action drift turbulence. Here we show matched observations modeling coherent, large-scale electrostatic structures, generated during interaction short-scale turbulence flows at magnetopause. The were made Cluster spacecraft numerical was performed using wave-kinetic approach wave-zonal interactions. Good agreement between simulations found, thus...
The production of high-energy protons by the 'hole-boring' radiation pressure acceleration (HB-RPA) mechanism laser-driven ion is examined in case where plasma has a density less than a0nc 2D. Previously this was 1D (Robinson 2011 Phys. Plasmas 18 056701) and motivated previous predictions non-linear criterion for an ultra-intense laser pulse to penetrate dense plasma. By reducing well below proton energies achieved increases considerably, thus leading >100 MeV at intensities close current...
A systematic experimental and computational investigation of the effects three well characterized density scalelengths on fast electron energy transport in ultra-intense laser-solid interactions has been performed. Experimental evidence is presented which shows that, when scalelength sufficiently large, beam entering solid-density plasma best described by two distinct populations: those accelerated within coronal (the pre-beam) near or at critical surface main-beam). The former considerably...
Here we investigate, using relativistic fluid theory and Vlasov-Maxwell simulations, the local heating of a dense plasma by two crossing electron beams. Heating occurs as an instability beams drives Langmuir waves, which couple nonlinearly into damped ion-acoustic waves. Simulations show factor 2.8 increase in kinetic energy with coupling efficiency 18%. Our results support applications to production warm matter driver for inertial fusion plasmas.
In this Letter, we investigate the effect of orbital angular momentum (OAM) on elastic photon-photon scattering in a vacuum for first time. We define exact solutions to electromagnetic wave equation which carry OAM. Using those, expected coupling between three initial waves is derived framework an effective field theory based Euler-Heisenberg Lagrangian and shows that OAM adds signature generated photons thereby greatly improving signal-to-noise ratio. This forms basis proposed high-power...
Raman or Brillouin amplification of a laser beam in plasma has long been seen as way to reach multi-PW powers compact systems. However, no significant plasma-based pulse beyond 0.1 TW achieved nearly 20 years, and only one report 1 TW. In this paper, we reveal novel non-linear criteria for the initial seed that will finally open door efficient petawatt Joule-level energies. We show triple product coupling constant [Formula: see text], duration text] amplitude (or Brillouin) must exceed...
The propagation of electrostatic plasma waves having relativistic phase speed and amplitude has been studied. is described as a warm, relativistic, collisionless, nonequilibrium, one-dimensional electron fluid. Wave-breaking limits for the field are calculated nonrelativistic initial temperatures arbitrary velocities, correspondence between wave breaking background particle trapping uncovered. Particular care given to ultrarelativistic regime (γφ2kBT0∕(mec2)≫1), since conflicting results...
The absorption of an ultra-intense circularly-polarized laser pulse by a near-critical (0.1nc < ne a0nc) plasma is studied. Previously two regimes have been suggested: 'leading edge depletion' (LED) regime and 'transverse ponderomotive acceleration' regime. Here we seek to describe these concepts more thoroughly, determine if distinct actually exist. New analytic models each are derived. These compared with 1D 2D particle-in-cell simulations, good quantitative agreement found, showing the...
The interaction between broadband drift mode turbulence and zonal flows has been studied through the wave-kinetic approach. Simulations have conducted in which a particle-in-cell representation is used for quasiparticles, while fluid model employed plasma. interactions plasma edge configuration applications both tokamak physics magnetopause boundary layer studies. Simulation results show development of flow modulational instability wave distribution, as well existence solitary structures...
In this work, wave breaking for general non-quasi-static oscillations in warm plasma is investigated using Lagrangian methods. particular, the effects of secular behavior on wave-breaking limits are explored, and it shown that thermal can sometimes prevent by curbing behavior. The oscillation equations fully relativistic cast into form, derived waves having nonconstant density. These results have important applications electron acceleration schemes employ a wakefield or slow beat propagating...