A5058879058- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Distributed and Parallel Computing Systems
- Plasma Diagnostics and Applications
- Laser-Matter Interactions and Applications
- Quantum and Classical Electrodynamics
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Terahertz technology and applications
- High-pressure geophysics and materials
- Electrostatic Discharge in Electronics
- Muon and positron interactions and applications
- Ionosphere and magnetosphere dynamics
- Gamma-ray bursts and supernovae
University College London
2018-2022
Campbell Collaboration
2020-2022
Bury College
2019
Google (United States)
2019
Center for Free-Electron Laser Science
2016-2018
Universität Hamburg
2013-2018
Institute of Theoretical Physics
2013
Deutsches Elektronen-Synchrotron DESY
2009-2012
Japan Association for International Chemical Information
2009
University of Oxford
2007-2008
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
Abstract This Conceptual Design Report describes LUXE (Laser Und XFEL Experiment), an experimental campaign that aims to combine the high-quality and high-energy electron beam of European with a powerful laser explore uncharted terrain quantum electrodynamics characterised by both high energy intensity. We will reach this hitherto inaccessible regime physics analysing electron-photon photon-photon interactions in extreme environment provided intense focus. The background its relevance are...
X-ray crystallography is one of the main methods to determine atomic-resolution 3D images whole spectrum molecules ranging from small inorganic clusters large protein complexes consisting hundred-thousands atoms that constitute macromolecular machinery life. Life not static, and unravelling structure dynamics most important reactions in chemistry biology essential uncover their mechanism. Many these reactions, including photosynthesis which drives our biosphere, are light induced occur on...
It is a long-standing nontrivial prediction of quantum electrodynamics that its vacuum unstable in the background static, spatially uniform electric field and, principle, sparks with spontaneous emission electron-positron pairs. However, an experimental verification this seems out reach because sizeable rate for pair production requires extraordinarily strong strength $|\mathbf{E}|$ order Schwinger critical field,...
This Letter of Intent describes LUXE (Laser Und XFEL Experiment), an experiment that aims to use the high-quality and high-energy electron beam European a powerful laser. The scientific objective is study quantum electrodynamics processes in regime strong fields. High-energy electrons, accelerated by linear accelerator, photons, produced via Bremsstrahlung those colliding with laser shall experience electric field up three times larger than Schwinger critical (the at which vacuum itself...
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use high energy protons drive wakefields in plasma has been demonstrated during Run 1 AWAKE programme at CERN. Protons 400 GeV drove that accelerated electrons 2 under 10 m plasma. collaboration now embarking on with main aims demonstrate stable accelerating gradients 0.5–1 GV/m, preserve emittance electron bunches and develop sources scalable 100s metres beyond. By end 2, scheme should...
Physics Beyond Colliders is an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its infrastructure in next two decades through projects complementary to LHC, HL-LHC other possible future colliders. These should target fundamental physics questions that are similar spirit those addressed by high-energy colliders, but require different types beams experiments. A kick-off workshop held September 2016 identified a number areas interest working...
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...
We propose a novel way to search for feebly interacting massive particles, exploiting two properties of systems involving collisions between high energy electrons and intense laser pulses. The first property is that the electron-intense-laser collision results in large flux hard photons, as behaves effectively thick medium. second emitted photons free-stream inside thus them very thin Combining these features implies an apparatus which can efficiently convert UV hard, co-linear photons....
The studies of strong field particle physics processes in electron/laser interactions and lepton collider interaction points (IPs) are reviewed. These defined by the high intensity electromagnetic fields involved need to take them into account as fully possible. Thus, main theoretical framework considered is Furry picture within intense quantum theory. In this framework, influence a background Lagrangian calculated nonperturbatively, involving exact solutions for quantized charged particles...
Any future high energy e+e− linear collider aims at precision measurements of Standard Model quantities as well new, not yet discovered phenomena. In order to pursue this physics programme, excellent detectors the interaction region have be complemented by beam diagnostics unprecedented precision. This article gives an overview current plans and issues for polarimeters spectrometers International Linear Collider, which been designed fulfill goals a large range energies from 45.6 GeV Z0 pole...
The AWAKE experiment had a very successful Run 1 (2016-8), demonstrating proton-driven plasma wakefield acceleration for the first time, through observation of modulation long proton bunch into micro-bunches and electrons up to 2 GeV in 10 m plasma. aims (2021-4) are have high-charge bunches accelerated high energy, about GeV, maintaining beam quality showing that process is scalable. scheme therefore promising method accelerate energy over short distances so develop useable technology...
We propose a novel way to search for feebly interacting massive particles, exploiting two properties of systems involving collisions between high energy electrons and intense laser pulses. The first property is that the electron-intense-laser collision results in large flux hard photons, as behaves effectively thick medium. second emitted photons free-stream inside thus them very thin Combining these features implies an apparatus which can efficiently convert UV hard, co-linear photons....
This paper describes the design and construction of a Cherenkov detector conceived with regard to high energy Compton polarimeters for International Linear Collider, where beam diagnostic systems unprecedented precision must complement interaction region detectors pursue an ambitious physics programme. Besides prototype detector, detailed simulation studies are presented. Results first testbeam campaign main objective validating in terms light distribution inside channels channel response...
The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates halo provide acceptable background in detector and has a provision state-of-the art instrumentation order reach ILC's physics goals. This paper describes design details status of baseline configuration considered reference also lists alternatives.
We describe initial steps in the development of technology for a THz-driven accelerator that will drive compact attosecond X-ray light source. structures represent promising emerging acceleration sub-femtosecond electron bunches. The millimeter scale driving field offers favorable compromise between conventional accelerators which are proven and reliable but large costly, other advanced like plasma-based or laser-driven devices where microscopic make device control difficult limit charge...
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. show that wakefields' growth amplitude increase with increasing seed as well charge using maximum radius of distribution measured on screen downstream from externally injecting electrons measuring their final energy. Measurements agree trends predicted theory numerical simulations validate our understanding development self-modulation. Experiments...
Abstract In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE about 5%. agreement achieved in population scans two selected plasma densities and scan longitudinal density gradient. reached only case wide enough simulation box (several...
We report preliminary results of beam tests the FONT3 Linear Collider intra-train position feedback system prototype at Accelerator Test Facility KEK. The incorporates a novel monitor (BPM) processor with latency below 5 nanoseconds, and kicker driver amplifier similar low latency. 56 nanosecond-long bunchtrain in ATF extraction line was used to test BPM processor. achieved will allow demonstration on timescales relevant even for CLIC design.
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
We study experimentally the effect of linear plasma density gradients on self-modulation a 400\,GeV proton bunch. Results show that positive/negative gradient in/decreases number micro-bunches and relative charge per micro-bunch observed after 10\,m plasma. The measured modulation frequency also in/decreases. With largest positive we observe two frequencies in power spectrum. are consistent with changes wakefields' phase velocity due to adding slow during growth predicted by theory.
Some non linear, second order QED processes in the presence of intense plane electromagnetic waves are investigated. Analytic expressions with general kinematics derived for Compton scattering and $e^+e^-$ pair production a circularly polarised external field. The differential cross sections were investigated numerically photon energies up to 50 MeV, field intensity parameter $\nu^2$ value 2, all angles. variation full respect was also established. led resonances sections. These by...