A5035402769- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Magnetic Properties of Alloys
- X-ray Spectroscopy and Fluorescence Analysis
- Gyrotron and Vacuum Electronics Research
- Advanced Surface Polishing Techniques
- Laser Design and Applications
- Particle Detector Development and Performance
- Geomagnetism and Paleomagnetism Studies
- Laser-induced spectroscopy and plasma
- Magnetic properties of thin films
- Enzyme Structure and Function
- Atomic and Subatomic Physics Research
- Magnetic Properties and Applications
- Ranque-Hilsch vortex tube
- Metallurgical Processes and Thermodynamics
- Atomic and Molecular Physics
- Advanced Optical Sensing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Pulsed Power Technology Applications
- Muon and positron interactions and applications
Synchrotron soleil
2011-2024
Brookhaven National Laboratory
2013-2018
Abstract Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning from the infrared to X-ray domains. The recent development of short-wavelength seeded free-electron now allows for unprecedented levels control on longitudinal coherence, opening new scientific avenues such as ultra-fast dynamics complex systems and nonlinear optics. Although those devices rely state-of-the-art large-scale accelerators, advancements laser-plasma which harness...
Abstract With gigaelectron-volts per centimetre energy gains and femtosecond electron beams, laser wakefield acceleration (LWFA) is a promising candidate for applications, such as ultrafast diffraction, multistaged colliders radiation sources (betatron, compton, undulator, free laser). However, some of these the beam performance, example, spread, divergence shot-to-shot fluctuations, need drastic improvement. Here, we show that, using dedicated transport line, can mitigate initial...
High gradient quadrupoles are necessary for different applications such as laser plasma acceleration, colliders, and diffraction limited light sources. Permanent magnet provide a higher field strength compactness than conventional electro-magnets. An original design of permanent based quadrupole (so-called "QUAPEVA"), composed Halbach ring placed in the center with bore radius 6 mm surrounded by four cylinders capable providing 210 T/m, is presented. The QUAPEVAs, including magnetic...
Short period, high field undulators are used to produce hard x-rays on synchrotron radiation based storage ring facilities of intermediate energy and enable short wavelength free electron laser. Cryogenic permanent magnet take benefit from improved magnetic properties ${\mathrm{RE}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ (Rare Earth magnets) at low temperatures for achieving coercivity. Using ${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ instead ${\mathrm{Nd}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$,...
The laser plasma accelerator has shown a great promise where it uses wakefields achieving gradients as high GeV/cm. With such properties, one would be able to build much more compact accelerators, compared the conventional RF ones, that could used for wide range of fundamental research and applied applications. However, electron beam properties are quite different, in particular, divergence, leading significant growth emittance along transport line. It is, thus, essential mitigate via strong...
Laser Plasma Acceleration (LPA) is capable of producing a GeV beam within cm accelerating distance, but with rather high initial divergence and large energy spread. COXINEL aims to demonstrate compact Free Electron using such source, where specific transport line adequate elements used, as tunable gradient quadrupoles for handling the divergence. An innovative permanent magnet based quadrupole (QUAPEVA) made two superimposed generating 200 T/m presented. The first consists magnets shaped...
Abstract Undulator based synchrotron light sources and Free Electron Lasers (FELs) are valuable modern probes of matter with high temporal spatial resolution. Laser Plasma Accelerators (LPAs), delivering GeV electron beams in few centimeters, good candidates for future compact sources. However the barriers set by large energy spread, divergence shot-to-shot fluctuations require a specific transport line, to shape beam phase space achieving ultrashort undulator radiation suitable users even...
For an in‐vacuum undulator operated at small gaps the permanent magnet material needs to be highly resistant possible electron beam exposure. At room temperature, one generally uses Sm2Co17 or high coercivity NdFeB magnets expense of a limited field performance. In cryogenic (CPMU), temperature around 150 K, any grade reveals large enough radiation resistant. particular, very remanence can used build undulators with enhanced and X‐ray brilliance photon energy provided that pre‐baking above...
Short period high field undulators are of interest for X-ray brilliance enhancement in synchrotron radiation applications and compact Free Electron Lasers. Cryogenic in-vacuum [1] one the possible solutions. At SOLEIL, PrFeB magnets were directly chosen, even if still under development at that time. Indeed, they enable to avoid spin transition reorientation phenomenon which occurs with NdFeB [2] can be cooled down 77 K. The first selected grade CR53 from Hitachi presents a remanence 1.35 T...
The National Synchrotron Light Source-II (NSLS-II) project is now in the final stage of construction. Linac, Booster synchrotron, and Storage Ring magnets girder assemblies have been installed. first damping wiggler has delivered its field characteristics are carefully measured. A Three Pole Wiggler (3PW) Apple-II type elliptically polarizing undulators (EPUs) fabricated by vendors. Two 3.0m long in-vacuum (IVUs) one 1.5m IVU almost complete waiting for factory acceptance tests. One...
The NSLS-II storage ring completed commissioning in 2014 and all project-beamline IDs have also been commissioned. As of February 2015, six beamlines are about to finish commissioning. By the end is expected store 300 mA with top-up injection capability 500 a second superconducting RF cavity installed following year. design principle employ low-field BMs simultaneously install high-field wigglers non-dispersive straights reduce horizontal emittance. more installed, smaller electron beam...
We propose an approach to the optimization of segmented in-vacuum undulators, in which different segments along undulator may have gaps and periods. This enables close matching between vertical "envelope" electron beam motion a storage ring straight section (carefully satisfying associated "stay clear" constraint) and, at same time, precise tuning all fundamental photon energy. Placing together with periods introduce small kicks trajectories segment junctions, can be easily compensated,...
Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free laser future colliders. Nevertheless, LPA divergence energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, particular with pointing fluctuations, sets real challenge control dispersion along beam transport. We examine here how magnetic defects first quadrupoles, particular,...
Abstract Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning from the infrared to X-ray domains. The recent development of short-wavelength seeded free-electron now allows for unprecedented levels control on longitudinal coherence[1], opening new scientific avenues as ultra-fast dynamics complex systems and nonlinear optics. While those devices rely state-of-the-art large-scale accelerators, advancements laser-plasma which harness giga-volt-per-centimeter...
In-vacuum undulators (IVU) [1–7] are used extensively at light source facilities, in particular medium-energy storage rings, where these devices the main sources of high-brightness hard X-ra...
Laser plasma acceleration (LPA) enables the generation of an up to several GeV electron beam with a short bunch length and high peak current within centimeter scale. In view undulator type light source applications, manipulation has be applied. We report here on detailed transport for LPA COXINEL test line, that consists strong permanent quadrupoles handle divergence, magnetic chicane reduce energy spread second set adjusting focusing inside undulator. After describing measured...
Segmented Adaptive Gap in-vacuum Undulator (SAGU), in which different segments have gaps and periods, promises a considerable spectral performance gain over conventional undulator with uniform gap period. According to calculations, this can be comparable the achievable superior technology (e.g. room-temperature hybrid SAGU would perform as cryo-cooled period). However, for reaching high performance, magnetic design has include compensation of kicks experienced by electron beam at segment...