B. T. Spiers
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View article: Observation of Monoenergetic Electrons from Two-Pulse Ionization Injection in Quasilinear Laser Wakefields
Observation of Monoenergetic Electrons from Two-Pulse Ionization Injection in Quasilinear Laser Wakefields Open
The generation of low emittance electron beams from laser-driven wakefields is crucial for the development of compact x-ray sources. Here, we show new results for the injection and acceleration of quasimonoenergetic electron beams in low a…
View article: Ionization states for the multipetawatt laser-QED regime
Ionization states for the multipetawatt laser-QED regime Open
A paradigm shift in the physics of laser-plasma interactions is approaching with the commissioning of multi-petawatt laser facilities world-wide. Radiation reaction processes will result in the onset of electron-positron pair cascades and,…
View article: Pathways towards break even for low convergence ratio direct-drive inertial confinement fusion
Pathways towards break even for low convergence ratio direct-drive inertial confinement fusion Open
Following indirect-drive experiments which demonstrated promising performance for low convergence ratios (below 17), previous direct-drive simulations identified a fusion-relevant regime which is expected to be robust to hydrodynamic insta…
View article: Suprathermal electrons from the anti-Stokes Langmuir decay instability cascade
Suprathermal electrons from the anti-Stokes Langmuir decay instability cascade Open
The study of parametric instabilities has played a crucial role in understanding energy transfer to plasma and, with that, the development of key applications such as inertial confinement fusion. When the densities are between 0.11n_{c}≲n_…
View article: Methods for extremely sparse-angle proton tomography
Methods for extremely sparse-angle proton tomography Open
Proton radiography is a widely-fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here, th…
View article: Enabling the Realisation of Proton Tomography
Enabling the Realisation of Proton Tomography Open
The proton radiography diagnostic is widely used in laser-plasma experiments to make magnetic field measurements. Recent developments in analysis have enabled quantitative reconstruction of path-integrated magnetic field values, but making…
View article: Whole-beam self-focusing in fusion-relevant plasma
Whole-beam self-focusing in fusion-relevant plasma Open
Fast ignition inertial confinement fusion requires the production of a low-density channel in plasma with density scale-lengths of several hundred microns. The channel assists in the propagation of an ultra-intense laser pulse used to gene…
View article: One-dimensional hydrodynamic simulations of low convergence ratio direct-drive inertial confinement fusion implosions
One-dimensional hydrodynamic simulations of low convergence ratio direct-drive inertial confinement fusion implosions Open
Indirect drive inertial confinement fusion experiments with convergence ratios below 17 have been previously shown to be less susceptible to Rayleigh–Taylor hydrodynamic instabilities, making this regime highly interesting for fusion scien…
View article: Preparations for a European R&D roadmap for an inertial fusion demo reactor
Preparations for a European R&D roadmap for an inertial fusion demo reactor Open
A European consortium of 15 laboratories across nine nations have worked together under the EUROFusion Enabling Research grants for the past decade with three principle objectives. These are: (a) investigating obstacles to ignition on mega…
View article: Nonlinear wakefields and electron injection in cluster plasma
Nonlinear wakefields and electron injection in cluster plasma Open
Laser and beam driven wakefields promise orders of magnitude increases in electric field gradients for particle accelerators for future applications. Key areas to explore include the emittance properties of the generated beams and overcomi…
View article: Wakefields in a cluster plasma
Wakefields in a cluster plasma Open
We report the first comprehensive study of large amplitude Langmuir waves in a plasma of nanometer-scale clusters. Using an oblique angle single-shot frequency domain holography diagnostic, the shape of these wakefields is captured for the…
View article: Orbital Angular Momentum Coupling in Elastic Photon-Photon Scattering
Orbital Angular Momentum Coupling in Elastic Photon-Photon Scattering Open
In this Letter, we investigate the effect of orbital angular momentum (OAM) on elastic photon-photon scattering in a vacuum for the first time. We define exact solutions to the vacuum electromagnetic wave equation which carry OAM. Using th…
View article: Kinetic simulations of fusion ignition with hot-spot ablator mix
Kinetic simulations of fusion ignition with hot-spot ablator mix Open
Inertial confinement fusion fuel suffers increased x-ray radiation losses when carbon from the capsule ablator mixes into the hot-spot. Here, we present one- and two-dimensional ion Vlasov-Fokker-Planck simulations that resolve hot-spot se…
View article: Attosecond-scale absorption at extreme intensities
Attosecond-scale absorption at extreme intensities Open
A novel non-ponderomotive absorption mechanism, originally presented by Baeva et al. [Phys. Plasmas 18, 056702 (2011)] in one dimension, is extended into higher dimensions for the first time. This absorption mechanism, the Zero Vector Pote…
View article: Advantages to a diverging Raman amplifier
Advantages to a diverging Raman amplifier Open
The plasma Raman instability can efficiently compress a nanosecond long high-power laser pulse to sub-picosecond duration. Although, many authors envisaged a converging beam geometry for Raman amplification, here we propose the exact oppos…
View article: Wakefields in a Cluster Plasma
Wakefields in a Cluster Plasma Open
We report the first comprehensive study of large amplitude Langmuir waves in a plasma of nanometer-scale clusters. Using an oblique angle single-shot frequency domain holography diagnostic, the shape of these wakefields is captured for the…
View article: Attosecond-scale absorption at extreme intensities
Attosecond-scale absorption at extreme intensities Open
A novel non-ponderomotive absorption mechanism, originally presented by Baeva et al. [Phys. Plasmas 18, 056702 (2011)] in one dimension, is extended into higher dimensions for the first time. This absorption mechanism, the Zero Vector Pote…