A5028042377- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Laser Design and Applications
- Pulsed Power Technology Applications
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Advanced Fiber Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Mass Spectrometry Techniques and Applications
- Radiation Therapy and Dosimetry
- Photocathodes and Microchannel Plates
- Diamond and Carbon-based Materials Research
Deutsches Elektronen-Synchrotron DESY
2015-2024
Lawrence Berkeley National Laboratory
2010-2024
Universität Hamburg
2011-2023
University of California, Berkeley
2010-2022
University of Strathclyde
2022
Cockcroft Institute
2018-2022
Hamburg Institut (Germany)
2017-2022
University College London
2022
Imperial College London
2010-2021
New York University
2021
Abstract Plasma-based accelerators use the strong electromagnetic fields that can be supported by plasmas to accelerate charged particles high energies. Accelerating field structures in plasma generated powerful laser pulses or particle beams. This research has recently transitioned from involving a few small-scale efforts development of national and international networks scientists substantial investment large-scale infrastructure. In this New Journal Physics 2020 Plasma Accelerator...
Laser-driven, quasimonoenergetic electron beams of up to approximately 200 MeV in energy have been observed from steady-state-flow gas cells. These emitted within a low-divergence cone 2.1+/-0.5 mrad FWHM display unprecedented shot-to-shot stability (2.5% rms), pointing (1.4 and charge (16% rms) owing highly reproducible gas-density profile the interaction volume. Laser-wakefield acceleration cells this type provides simple reliable source relativistic electrons suitable for applications...
Abstract Laser wakefield accelerators promise to revolutionize many areas of accelerator science. However, one the greatest challenges their widespread adoption is difficulty in control and optimization outputs due coupling between input parameters dynamic evolution accelerating structure. Here, we use machine learning techniques automate a 100 MeV-scale accelerator, which optimized its by simultaneously varying up six including spectral spatial phase laser plasma density length. Most...
We report experimental results on laser-driven electron acceleration with low divergence. The beam was generated by focussing 750 mJ, 42 fs laser pulses into a gas-filled capillary discharge waveguide at densities in the range between 10 18 and 19 cm 3 . Quasi-monoenergetic bunches energies as high 500 MeV have been detected, features reaching up to 1 GeV, albeit large shot-to-shot fluctuations. A more stable regime higher bunch charge (20-45 pC) less energy (200-300 MeV) could also be...
We investigate the influence of a tilted laser-pulse-intensity front on laser-wakefield acceleration. Such asymmetric light pulses may be exploited to obtain control over electron-bunch-pointing direction and in our case allowed for reproducible electron-beam steering an all-optical way within 8 mrad opening window with respect initial laser axis. also discovered evidence collective electron-betatron oscillations due off-axis electron injection into wakefield induced by pulse-front tilt....
We present a study on the emittance evolution of electron bunches, externally injected into laser-driven plasma waves using three-dimensional particle-in-cell (PIC) code OSIRIS. Results show order-of-magnitude transverse growth during injection process, if bunch is not matched to its intrinsic betatron motion inside wakefield. This behavior supported by analytic theory reproducing simulation data percent level. The length over which full develops found be less than or comparable typical...
Active plasma lensing is a compact technology for strong focusing of charged particle beams, which has gained considerable interest use in novel accelerator schemes. While providing $\mathrm{kT}/\mathrm{m}$ gradients, active lenses can have aberrations caused by radially nonuniform temperature profile, leading to degradation the beam quality. We present first direct measurement this aberration, consistent with theory, and show that it be fully suppressed changing from light gas species...
A tunable plasma-based energy dechirper has been developed at FLASHForward to remove the correlated spread of a 681 MeV electron bunch. Through interaction bunch with wakefields excited in plasma projected was reduced from FWHM 1.31% 0.33% without reducing stability incoming beam. The experimental results for variable density are good agreement analytic predictions and three-dimensional simulations. proof-of-principle dechirping strength 1.8 GeV/mm/m significantly exceeds those demonstrated...
Energy-efficient plasma-wakefield acceleration of particle bunches with low energy spread is a promising path to realizing compact free-electron lasers and colliders. High efficiency can be achieved simultaneously by strong beam loading plasma wakefields when accelerating carefully tailored current profiles [M. Tzoufras et al., Phys. Rev. Lett. 101, 145002 (2008)]. We experimentally demonstrate such optimal in nonlinear electron-driven accelerator. Bunches an initial 1 GeV were accelerated...
Abstract The interaction of intense particle bunches with plasma can give rise to wakes 1,2 capable sustaining gigavolt-per-metre electric fields 3,4 , which are orders magnitude higher than provided by state-of-the-art radio-frequency technology 5 . Plasma wakefields can, therefore, strongly accelerate charged particles and offer the opportunity reach energies smaller hence more widely available accelerator facilities. However, luminosity brilliance demands high-energy physics photon...
Optical parametric amplification (OPA) has opened a path towards completely new regime of
We introduce the Highly efficient Plasma Accelerator Emulation (HiPACE) code. It is a relativistic, electromagnetic, three-dimensional and fully parallelized particle-in-cell (PIC) code uses quasi-static approximation to efficiently simulate variety of beam-driven plasma-wakefield acceleration scenarios. HiPACE exploits disparity time scales in interaction highly relativistic particle beams with plasma decouple beam evolution. This enables steps which are many times greater than those used...
Particle-beam-driven plasma wakefield acceleration (PWFA) enables various novel high-gradient techniques for powering future compact light-source and high-energy physics applications. Here, a driving particle bunch excites response in medium, which may rapidly accelerate trailing witness beam. In this Letter, we present the measurement of ratios to deceleration driver bunch, so-called transformer ratio, significantly exceeding fundamental theoretical thus far experimental limit 2 PWFA. An...
Density down-ramp (DDR) injection is a promising concept in beam-driven plasma wakefield accelerators for the generation of high-quality witness beams. We review and complement theoretical principles method employ particle-in-cell (PIC) simulations order to determine constrains on geometry density ramp current drive beam, regarding applicability DDR injection. Furthermore, PIC are utilized find optimized conditions production explain intriguing result that an increased charge by means...
This document outlines a community-driven Design Study for 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need Advanced R\&D, and 2023 P5 calls ``delivery of an end-to-end design concept, including cost scales, with self-consistent parameters throughout." leverages recent experimental theoretical progress resulting from global R\&D program in order to deliver unified, Collider concept. Accelerators provide ultra-high accelerating gradients which enables...
We report on experimental studies of ion acceleration from spherical targets diameter $15\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ irradiated by ultraintense ($1\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) pulses a 20-TW Ti:sapphire laser system. A highly directed proton beam with plateau-shaped spectrum extending to energies up 8 MeV is observed in the propagation direction. This arises converging shock launched laser, which confirmed 3-dimensional...
We propose a new and simple strategy for controlled ionization-induced trapping of electrons in beam-driven plasma accelerator. The presented method directly exploits electric wakefields to ionize from dopant gas capture them into well-defined volume the accelerating focusing wake phase, leading high-quality witness bunches. This injection principle is explained by example three-dimensional particle-in-cell calculations using code OSIRIS. In these simulations high-current-density...
A finite radius plasma is proposed to generate wakefields that can focus and accelerate positron beams in a wakefield accelerator. The reduces the restoring force acting on electrons forming wakefield, resulting an elongation of on-axis return point and, hence, creating long, high-density electron filament. This results region with accelerating focusing fields for positrons, allowing acceleration quality-preserving transport high-charge beams.
We revise the calibration of scintillating screens commonly used to detect relativistic electron beams with low average current, e.g., from laser-plasma accelerators, based on new and expanded measurements that include higher charge density different types than previous work [Buck et al., Rev. Sci. Instrum. 81, 033301 (2010)]. Electron peak densities up 10 nC/mm2 were provided by focused picosecond-long delivered Linac for high Brilliance Emittance (ELBE) at Helmholtz-Zentrum...