395 citations · 1.9k across the 54 of their papers we have counts for
44 papers · 1 filter
Laser Interactions with Gas Jets: EMP Emission and Nozzle Damage
Philip Wykeham Bradford, Valeria Ospina-Bohorquez, Michael Ehret +18
Understanding the physics of electromagnetic pulse emission and nozzle damage is critical for the long-term operation of laser experiments with gas targets, particularly at facilit…
Plasma density profile reconstruction of a gas cell for Ionization Induced Laser Wakefield Acceleration
F. Filippi, L. T. Dickson, M. Backhouse +15
Laser-driven plasma wakefields can provide hundreds of MeV electron beam in mm-range distances potentially shrinking the dimension of the actual particle accelerators. The plasma d…
Automated control and optimisation of laser driven ion acceleration
B. Loughran, M. J. V. Streeter, H. Ahmed +32
The interaction of relativistically intense lasers with opaque targets represents a highly non-linear, multi-dimensional parameter space. This limits the utility of sequential 1D s…
Mechanisms to control laser-plasma coupling in laser wakefield electron acceleration
L. T. Dickson, C. I. D. Underwood, F. Filippi +16
Experimental results, supported by precise modelling, demonstrate optimisation of a plasma-based injector with intermediate laser pulse energy ( J), corresponding to a normalis…
Measurement of magnetic cavitation driven by heat flow in a plasma
Christopher Arran, Adam Dearling, Philip Bradford +13
We describe the direct measurement of the expulsion of a magnetic field from a plasma driven by heat flow. Using a laser to heat a column of gas within an applied magnetic field, w…
Spectrally peaked proton beams shock accelerated from an optically shaped overdense gas jet by a near-infrared laser
George S. Hicks, Oliver C. Ettlinger, Marco Borghesi +10
We report on the generation of impurity-free proton beams from an overdense gas jet driven by a near-infrared laser ( ). The gas profile was shaped prior to…
Photo-induced pair production and strong field QED on Gemini
CH Keitel, A Di Piazza, GG Paulus +12
The extreme intensities obtainable with lasers such as Gemini allow non-linear QED phenomena to be investigated according to our calculations. Electron-positron pair production fro…
Characterisation of Laser Wakefield Acceleration Efficiency with Octave Spanning Near-IR Spectrum Measurements
M. J. V. Streeter, Y. Ma, B. Kettle +25
We report on experimental measurements of energy transfer efficiencies in a GeV-class laser wakefield accelerator. Both the transfer of energy from the laser to the plasma wakefiel…
Compton recoil effects in staging of laser wakefield accelerators
M. J. V. Streeter, Z. Najmudin
Laser plasma accelerators capable of generating >10 GeV electron beams may require plasma mirrors to remove undepleted laser energy at the end of each accelerator stage. Near the p…
A New Injection and Acceleration Scheme of Positrons in the Laser-Plasma Bubble Regime
Z. Y. Xu, C. F. Xiao, H. Y. Lu +15
A novel approach for positron injection and acceleration in laser driven plasma wakefield is proposed. A theoretical model is developed and confirmed through PIC simulation. One ri…
Temporal Feedback Control of High-Intensity Laser Pulses to Optimize Ultrafast Heating of Atomic Clusters
M. J. V. Streeter, S. J. D. Dann, J. D. E. Scott +27
We describe how active feedback routines can be applied at limited repetition rate (5 Hz) to optimize high-power TW) laser interactions with clustered gases. Optimization of…
Ultrafast Imaging of Laser Driven Shock Waves using Betatron X-rays from a Laser Wakefield Accelerator
J. C. Wood, D. J. Chapman, K. Poder +21
Betatron radiation from laser wakefield accelerators is an ultrashort pulsed source of hard, synchrotron-like x-ray radiation. It emanates from a centimetre scale plasma accelerato…
General features of experiments on the dynamics of laser-driven electron-positron beams
J. R. Warwick, A. Alejo, T. Dzelzainis +14
The experimental study of the dynamics of neutral electron-positron beams is an emerging area of research, enabled by the recent results on the generation of this exotic state of m…
Laser wakefield acceleration with high-power, few-cycle mid-IR lasers
Daniel Papp, Jonathan C. Wood, Vincent Gruson +6
The study of laser wakefield electron acceleration (LWFA) using mid-IR laser drivers is a promising path for future laser driven electronaccelerators, when compared to traditional…
Laser Driving Highly Collimated -ray Pulses for the Generation of and Pairs in Collider
J. Q. Yu, R. H. Hu, Z. Gong +6
A scheme to generate highly collimated -ray pulse is proposed for the production of muon and electron pairs in collider. The -ray pulse, with high conversion efficiency…
Bright X-ray radiation from plasma bubbles in an evolving laser wakefield accelerator
M. S. Bloom, M. J. V. Streeter, S. Kneip +17
We show that the properties of the electron beam and bright x-rays produced by a laser wakefield accelerator can be predicted if the distance over which the laser self-focuses and…
Experimental evidence of radiation reaction in the collision of a high-intensity laser pulse with a laser-wakefield accelerated electron beam
J. M. Cole, K. T. Behm, T. G. Blackburn +21
The dynamics of energetic particles in strong electromagnetic fields can be heavily influenced by the energy loss arising from the emission of radiation during acceleration, known…
Experimental observation of a current-driven instability in a neutral electron-positron beam
J. Warwick, T. Dzelzainis, M. E. Dieckmann +16
We report on the first experimental observation of a current-driven instability developing in a quasi-neutral matter-antimatter beam. Strong magnetic fields ( 1 T) are measur…
Ultra-brilliance isolated attosecond gamma-ray light source from nonlinear Compton scattering
Jinqing Yu, Z. Najmudin, Ronghao Hu +3
The explosion in attosecond technology has opened the gate to investigating many unexplored areas which require ultrahigh spatial and temporal resolution. In the area of nuclear ph…
Laser-driven plasma acceleration in a regime of strong-mismatch between the incident laser envelope and the nonlinear plasma response
A. A. Sahai, K. Poder, J. C. Wood +4
We explore a regime of laser-driven plasma acceleration of electrons where the radial envelope of the laser-pulse incident at the plasma entrance is strongly mismatched to the nonl…
Spectral modification of shock accelerated ions using hydrodynamically shaped gas target
O. Tresca, N. P. Dover, N. Cook +5
We report on reproducible shock acceleration from irradiation of a m CO laser on optically shaped H and He gas targets. A low energy laser prepulse ($I\lesssim10…
Characterisation of deuterium spectra from laser driven multi-species sources by employing differentially filtered image plate detectors in Thomson spectrometers
A. Alejo, S. Kar, H. Ahmed +23
A novel method for characterising the full spectrum of deuteron ions emitted by laser driven multi-species ion sources is discussed. The procedure is based on using differential fi…
Optimisation of the pointing stability of laser-wakefield accelerated electron beams
R. J. Garland, K. Poder, J. Cole +13
Laser-wakefield acceleration is a promising technique for the next generation of ultra-compact, high-energy particle accelerators. However, for a meaningful use of laser-driven par…
Buffered spectrally-peaked proton beams in the relativistic-transparency regime
N. P. Dover, M. J. V. Streeter, C. A. J. Palmer +23
Spectrally-peaked proton beams ( MeV, MeV) have been observed from the interaction of an intense laser ( Wcm) with ultrathin CH foi…