A5074838318- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Laser-Matter Interactions and Applications
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Experimental and Theoretical Physics Studies
- Particle Detector Development and Performance
- Advanced Surface Polishing Techniques
- Radiation Detection and Scintillator Technologies
- Ionosphere and magnetosphere dynamics
- Plasma and Flow Control in Aerodynamics
- Complex Systems and Time Series Analysis
- Laser Design and Applications
- Mass Spectrometry Techniques and Applications
- Photocathodes and Microchannel Plates
- Paranormal Experiences and Beliefs
- Gas Dynamics and Kinetic Theory
Lawrence Berkeley National Laboratory
2018-2023
Deutsches Elektronen-Synchrotron DESY
2013-2019
Universität Hamburg
2012-2019
University of Lisbon
2017-2019
University of California, Berkeley
2019
Instituto Superior Técnico
2018
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...
Current models predict the hose instability to crucially limit applicability of plasma-wakefield accelerators. By developing an analytical model which incorporates evolution over long propagation distances, this work demonstrates that inherent drive-beam energy loss, along with initial beam spread detune betatron oscillations electrons, and thereby mitigate instability. It is also shown tapered plasma profiles can strongly reduce hosing seeds. Hence, we demonstrate a drive be stabilized...
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...
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...
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.
Mitigation of the beam hose instability in plasma-based accelerators is required for realization many applications, including colliders. The analyzed blowout regime plasma ion motion, and motion shown to suppress by inducing a head-to-tail variation focusing force experienced beam. Hence, stable acceleration possible, while, use proper bunch shaping, minimizing energy spread preserving transverse emittance.
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
The hose instability of the drive beam constitutes a major challenge for stable operation plasma wakefield accelerators (PWFAs). In this work, we show that beams with transverse size comparable to blowout radius generate wake varying focusing along beam, which leads rapid detuning slice-betatron oscillations and suppresses instability. This intrinsic stabilization principle provides an applicable effective method suppression hosing allows acceleration process.
Plasma-based accelerators offer the possibility to drive future compact light sources and high-energy physics applications. Achieving good beam quality, especially a small energy spread, is still one of major challenges. Here, we propose use periodically modulated plasma density shape longitudinal fields acting on an electron bunch in linear wakefield regime. With simulations, demonstrate on-average flat accelerating field that maintains spread.
The FLASHForward experimental facility is a high-performance test-bed for precision plasma wakefield research, aiming to accelerate high-quality electron beams GeV-levels in few centimetres of ionized gas. created by ionizing gas cell either high-voltage discharge or high-intensity laser pulse. electrons be accelerated will injected internally from the background externally FLASH superconducting RF front end. In both cases, driven provided gun and linac modules operating with 10 Hz...
We present a detailed analysis of the features and capabilities Wakefield-Induced Ionization (WII) injection in blowout regime beam driven plasma accelerators. This mechanism exploits electric wakefields to ionize electrons from dopant gas trap them well-defined region accelerating focusing wake phase, leading formation high-quality witness-bunches [Martinez de la Ossa et al., Phys. Rev. Lett. 111, 245003 (2013)]. The electron-beam drivers must feature high-peak currents (Ib0≳8.5 kA)...
Self-modulation of an electron beam in a plasma has been observed. The propagation long (several wavelengths) bunch overdense resulted the production multiple bunches via self-modulation instability. Using combination radio-frequency deflector and dipole spectrometer, time energy structure self-modulated was measured. longitudinal phase space measurement showed modulation into three with approximately $200\text{ }\text{ }\mathrm{keV}/c$ amplitude momentum modulation. Demonstrating this...
Hosing is a major challenge for the applicability of plasma wakefield accelerators and its modeling therefore fundamental importance to facilitate future stable compact plasma-based particle accelerators. In this contribution, we present new model evolution centroid, which enables accurate investigation hose instability in nonlinear blowout regime. It paves road more precise comprehensive studies hosing, e.g., with drive witness beams, were not possible previous models.
Witness beam stability and preservation of its ultra-low emittance have been identified as critical challenges toward realizing a TeV-class, plasma-based linear collider. In fact, the witness bunch parameters required by future TeV-class collider expected to trigger hosing instability background ion motion, leading degradation and, potentially, loss. Recently, it has shown that motion suppresses instability, proper longitudinal shaping can eliminate ion-motion-induced growth. this paper, we...
In 1867, just two years after laying the foundations of electromagnetism, J. Clerk Maxwell presented a fundamental paper on kinetic gas theory, in which he described evolution terms certain 'moments' its velocity distribution function. This inspired Ludwig Boltzmann to formulate his famous equation, from followed H-theorem and connection with entropy. On occasion 150th anniversary publication Maxwell's paper, we review Maxwell–Boltzmann formalism discuss how generality adaptability enable it...
In this work we provide an in-depth analysis of mechanisms which mitigate the hose instability in blowout regime plasma-wakefield accelerators. We show by means theory and three-dimensional particle-in-cell simulations that mitigation related to a beam energy spread are effective for parameters as used major accelerator experiments various energies, current profiles, types hosing seed. addition, establish theoretical principles reduction initial seed tapered vacuum-to-plasma transitions...
In dieser Arbeit werden mit Hilfe von theoretischen und numerischen Methoden Effekte untersucht, die in plasmabasierten Teilchenbeschleunigern transversale Elektronenstrahlqualitat beeinflussen. Die plasmabasierte Teilchenbeschleunigung ist ein vielversprechender Kandidat fur zukunftige Beschleunigertechologien. Dabei entweder hochintensive Laserpulse oder relativistische Teilchenstrahlen hohen Stromen auf Plasmen fokussiert, um Plasmawellen extremen transversalen longitudinalen Feldern zu...