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By employing a pair of partially overlapped supersonic gas jets, we made a separation of injection and acceleration stages of laser wakefield acceleration and produced stable, quasi-monoenergetic (10–30% FWHM) and tunable (50–300 MeV) electron beams.
We will outline recent progress, in the UK ASAIL laser-ion acceleration programme, which aims to advance laser-driven ion beams to the point at which they will become a serious alternative to conventional accelerators for radiotherapy.
A recent experiment confirmed the 35 years old prediction of Airy-shaped electron beams that accelerate in the absence of any potential. Yet their most intriguing property remained unclear: will such electrons emit radiation in free-space?
We report on optical non-paraxial beams that exhibit a self-accelerating behavior in radial direction. Hence, the intensity profile evolves on a spiraling trajectory. The beam parameters have been optimized for high contrast and rotation rate.
We introduce a new class of nonparaxial optical beams with a Bessel-like profile that are capable to laterally shift along fairly arbitrary trajectories during propagation in free space. Numerical simulations confirm our theoretical predictions.
We introduce loss-proof shape-invariant nonparaxial accelerating beams that overcome both diffraction and absorption, and demonstrate their use in acceleration of microparticles inside liquids along curved trajectories that are significantly steeper than ever achieved.
Lasers are an indispensable tool for current XUV and X-ray free electron light sources and are key to future laser driven accelerator technology. We discuss the role of fiber-laser technology in this emerging field.
Almost fully stripped aluminum ion acceleration up to 12 MeV/u from the interaction between the ultra-intense short pulse high contrast laser and the micrometer thick foil target is presented.
Particle-in-cell simulations show that quasimonoenergetic electron bunches with one-femtosecond initial duration may be produced from direct acceleration in a low-density gas. These bunches could find applications in ultrafast electron diffraction experiments.
We study the dynamics of accelerating beams impinging on different classes of index potentials. The analytic expressions for the reflected and transmitted waves show that the Airy-wave parabolic trajectory is modified with some particular exceptions.
Our experiments produced betatron x-rays up to 80 keV from a laser-wakefield accelerator. Measurements, performed with stacked image plates spectrometers, provide simultaneous information on the beam profile and spectrum at various angles of observation.
Accelerating beams completely rely on interference: coherent superposition of waves. In spite of that fundamental feature, we demonstrate, experimentally and theoretically, partially-spatially-incoherent nonparaxial accelerating beams.
The properties of optical, electron and plasmon beams that preserve their shape, while propagating along curved trajectories in free-space or on a surface are discussed. Methods to generate these beams and potential applications are presented.
We analytically study the propagation dynamics of two-dimensional accelerating beams in a generalized way and propose an optimized method to enhance their peak intensities. Our theoretical analysis is confirmed by experimental results.
Strong quasi-cw terahertz fields accelerate and recollide electron-hole pairs injected by a near-ir laser into GaAs quantum wells. A frequency comb is emitted, with up to 18 teeth separated by twice the terahertz frequency.
We demonstrate, numerically and experimentally, the generation of self-accelerating surface plasmon beams along arbitrary caustic curvatures by two-dimensional binary plasmonic phase masks. We examine both paraxial and non-paraxial curvatures accelerating along polynomial and exponential trajectories.
We present non-paraxial shape-preserving accelerating electromagnetic wavepackets propagating in micro-sized curved surfaces, revealing exotic trajectories and polarization rotation dynamics caused by the interplay of interference effects and the curvature of space.
We examine the interaction of relativistic laser pulses with plasma channels formed in a nitrogen cluster jet. We observe creation of nearly pure N5+ plasma channels and ionization injected wakefield beams with energies >100 MeV.
We theoretically show that it is possible to generate diffraction-resisting higher order Bessel beams with vortex profiles that follow arbitrary trajectories. Our theoretical results are supported by numerical simulations and agree well with experimental observations.
An adaptive spectral-phase control method is demonstrated for laser wakefield acceleration of electrons. Phase control capability was implemented to experimentally study the dependence of laser wakefield acceleration on the spectral phase of intense laser light.
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