A5065757723- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Electromagnetic Simulation and Numerical Methods
- Distributed and Parallel Computing Systems
- Muon and positron interactions and applications
- Crystallography and Radiation Phenomena
- Magneto-Optical Properties and Applications
- Medical Imaging Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Laser Design and Applications
- Photocathodes and Microchannel Plates
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Near-Field Optical Microscopy
- Electromagnetic Launch and Propulsion Technology
Cockcroft Institute
2013-2024
University of Liverpool
2014-2024
Sci-Tech Daresbury
2011-2024
Daresbury Laboratory
1999-2016
Lawrence Berkeley National Laboratory
2000-2006
Science and Technology Facilities Council
2006
Linac Coherent Light Source
2004-2005
Honda (Japan)
2005
Menlo School
2004-2005
Medical University of Lublin
2005
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
We discuss the theory of electromagnetic fields, with an emphasis on aspects relevant to radiofrequency systems in particle accelerators. begin by reviewing Maxwell's equations and their physical significance. show that free space, there are solutions representing propagation fields as waves. introduce potentials, how they can be used simplify calculation presence sources. derive Poynting's theorem, which leads expressions for energy density flux field. properties waves cavities, waveguides...
This report describes the conceptual design of a proposed free electron laser test facility called CLARA that will be major upgrade to existing VELA accelerator at Daresbury Laboratory in UK. able number new schemes have been but require proof principle experiment confirm they perform as predicted. The primary focus on ultra short photon pulse generation which take lasers into whole regime, enabling area science emerge.
For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest achieved single-bunch-mode operation of Accelerator Test Facility, which satisfies requirement x-band collider. The emittances were measured with a laser-wire beam-profile monitor installed damping ring. bunch length and momentum spread beam also recorded under same conditions. rms at intensity 4 pm energy 1.3 GeV, corresponds normalized 1.0x1.0(-8)...
We describe a novel technique, based on image compression and machine learning, for transverse phase space tomography in two degrees of freedom an accelerator beamline. The technique has been used the CLARA test facility at Daresbury Laboratory: results from learning method are compared with those conventional algorithm (algebraic reconstruction) applied to same data. use allows reconstruction 4D distribution beam be carried out much more rapidly than using algorithms also enables reduce...
The Twiss parameters provide a convenient description of beam optics in uncoupled linear lines. For coupled lines, variety approaches are possible for describing the optics; here, we propose an approach and notation that naturally generalizes familiar to case 3 degrees freedom. Our is based on eigensystem analysis matrix second-order moments, or alternatively (in storage ring) single-turn map. lattice functions emerge from this have interpretation conceptually very simple: particular,...
We derive completely integrated formulas for emittance growth times due to intrabeam scattering charged particle beams in the high energy limit, including effect of lattice parameters that vary around accelerator ring. Using lattices prototype damping ring called Accelerator Test Facility at KEK and those two proposed International Linear Collider rings, we compare our results with other calculations.
The compact linear accelerator for research and applications (CLARA) is an ultrabright electron beam test facility being developed at STFC Daresbury Laboratory. ultimate aim of CLARA to advanced free laser (FEL) schemes that can later be implemented on existing future short-wavelength FELs. In addition, a unique provide high-quality novel concepts ideas in wide range disciplines function as technology demonstrator United Kingdom x-ray FEL facility. built three phases; the first phase, or...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
We present a method to measure and reconstruct the full 4D transverse phase space of particle beam. The assumes that it is possible freely independently rotate separate 2D spaces in horizontal vertical directions. Using images beam would be captured on screen, we develop mathematical procedure will distribution. simulate this for hypothetical distribution show reconstruction agrees with actual Finally, demonstrate practical case two-quadrupole setup indeed adjust quadrupole strengths so can...
The anomalous magnetic moment of the muon is one most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from Standard Model expectation by approximately 3.5 standard deviations. goal new experiment, E989, now under construction Fermilab, a fourfold improvement precision. Here, we discuss details future and its current status.
Abstract The effect of multiple small-angle Coulomb scattering, or intrabeam scattering (IBS) is routinely observed in electron storage rings over the typical damping time scale milliseconds. So far, IBS has not been single pass accelerators because charge density orders magnitude higher than would be needed. We show that such now available at high brightness linacs for free-electron lasers (FELs). report measurements beam energy spread FERMI linac presence microbunching instability, which...
We show that the combination of a scanning near field optical microscope and an infra-red free electron laser yields chemical images with sub-cellular spatial resolution have potential to provide diagnostic for oesophageal adenocarcinoma.
Fringe fields in multipole magnets can have a variety of effects on the linear and nonlinear dynamics particles moving along an accelerator beamline. An accurate model must include realistic models magnet fringe fields. for dipoles are well understood be modelled at early stage design such codes as MAD8, MADX or ELEGANT. However, usually it is not until final stages project that possible to quadrupoles higher order multipoles. Even then, existing techniques rely use numerical field map,...
The transverse phase space of a beam in an accelerator can be characterized using well-established methods based on observation changes the profile between screens at different locations along beamline, or single screen for strengths upstream quadrupoles. Studies CLARA FE (the Compact Linear Accelerator Research and Applications Front End, Daresbury Laboratory, UK) show that where has complicated (nonelliptical) distribution space, conventional analysis techniques aimed characterizing terms...
Synchronizing free-electron laser pulses for time-resolved experiments is necessary as an unsynchronized system reduces the effective repetition rate of experiment. Additionally, longitudinal coherence and spectral brightness are limited by electron beam energy spread. In this paper, a variable bunch compressor design compression schemes were developed to: reduce klystron-induced arrival time jitter 85% while preserving peak current transverse emittance to minimize correlated spread...
We present an updated design for a proposed source of ultra-fast synchrotron radiation pulses based on recirculating superconducting linac, in particular the incorporation EUV and soft x-ray production. The project has been named LUX - Linac-based Ultrafast X-ray facility. produces intense with duration 10-100 fs at 10 kHz repetition rate, synchronization 10's fs, optimized study dynamics. photon range covers to hard spectrum by use seeded harmonic generation undulators, specialized...
For synchrotron light sources and for damping rings of linear colliders it is important to be able minimize the vertical emittance correct spurious dispersion. This allows one maximize brightness and/or luminosity. A commonly used tool measure skew error distribution analysis orbit response matrices using codes like LOCO. Using new Matlab version LOCO 18 newly installed power supplies individual quadrupoles at ALS ratio could reduced below 0.1% 1.9 GeV yielding a about 5 pm. At those very...
A single human oesophageal adenocarcinoma cell (OE33) has been imaged using aperture infrared scanning near-field optical microscopy (IR-SNOM) in transmission and reflection also by Fourier-transform (FTIR) microspectroscopy only. This work presents the first images obtained both of same specimen IR-SNOM technique. The results have used to compare two SNOM modes techniques, which complementary capabilities. technique necessitates a very stable source careful choice wavelengths, since it is...