A5060575716- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Photocathodes and Microchannel Plates
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Laser Design and Applications
- Crystallography and Radiation Phenomena
- Pulsed Power Technology Applications
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Plasma Diagnostics and Applications
- Photonic and Optical Devices
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advancements in Photolithography Techniques
- Carbon Nanotubes in Composites
- Magnetic confinement fusion research
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Laser-Matter Interactions and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Radiation Therapy and Dosimetry
Northern Illinois University
2015-2024
Argonne National Laboratory
2006-2024
SLAC National Accelerator Laboratory
2023
ITMO University
2023
Fermi National Accelerator Laboratory
2013-2022
Alex's Lemonade Stand Foundation
2022
RadiaBeam Technologies (United States)
2015-2018
St Petersburg University
2018
Pohang University of Science and Technology
2017
Lawrence Berkeley National Laboratory
2016
The following topics are dealt with: TTF/FLASH in the XFEL context, general layout of facility, accelerator, undulators for SAES and spontaneous emission, photon beamlines scientific instruments, infrastructure auxiliary systems, commissioning operation, project management organization, cost time schedule. (HSI)
We present the first observation of self-amplified spontaneous emission (SASE) in a free-electron laser (FEL) vacuum ultraviolet regime at 109 nm wavelength (11 eV). The observed gain (approximately 3000) and radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width, intensity fluctuations, are all consistent with models for SASE FELs.
Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring bunch charge distribution. A complete characterization linear and nonlinear modes SASE FEL operation was performed. At saturation produces (30-100 fs FWHM) with a peak power GW level full transverse coherence. wavelength tuned range 95-105 nm.
Jefferson Laboratory's kW-level infrared free-electron laser utilizes a superconducting accelerator that recovers about 75% of the electron-beam power. In achieving first lasing, operated "straight ahead" to deliver 38-MeV, 1.1-mA cw current for lasing near 5 &mgr;m. The waste beam was sent directly dump while producing stable operation at up 311 W. Utilizing recirculation loop send electron back linac energy recovery, machine has now recovered average currents mA, and lased with 1720 W output 3.1
A novel method of producing intense short wavelength radiation from relativistic electrons is described. The are periodically bunched at the interest enabling in-phase superradiant emission that far more than unbunched electrons. periodic bunching achieved in steps beginning with an array beamlets emitted a nanoengineered field array. then manipulated and converted to longitudinal density modulation via transverse-to-longitudinal emittance exchange. Periodic shown be possible, partially...
The Integrable Optics Test Accelerator (IOTA) is a storage ring for advanced beam physics research currently being built and commissioned at Fermilab. It will operate with protons electrons using injectors momenta of 70 150 MeV/c, respectively. program includes the study nonlinear focusing integrable optical lattices based on special magnets electron lenses, dynamics space-charge effects their compensation, stochastic cooling, several other experiments. In this article, we present design...
We report on the experimental generation of a train subpicosecond electron bunches. The bunch is accomplished using beam line capable exchanging coordinates between horizontal and longitudinal degrees freedom. An initial consisting set horizontally separated beamlets converted into bunches temporally with tunable duration separation. experiment reported in this Letter unambiguously demonstrates conversion process its versatility.
The ability to generate small transverse emittance is perhaps the main limiting factor for performance of high-gain x-ray free-electron lasers (FELs). Noting that beams from an rf photocathode gun can have energy spread much smaller than required efficient FEL interaction, we present a method produce normalized at or below about $0.1\text{ }\ensuremath{\mu}\mathrm{m}$, which will lead significantly shorter length undulator as well lower electron beam project. manipulation consists producing...
Linear acceleration in free space is a topic that has been studied for over 20 years, and its ability to eventually produce high-quality, high energy multi-particle bunches remained subject of great interest. Arguments can certainly be made such an very doubtful. Nevertheless, we chose develop accurate truly predictive theoretical formalism explore this remote possibility computational experiment. The includes exact treatment Maxwell's equations, relativistic the interaction among multiple...
Beams with cross-plane coupling or extreme asymmetries between the two transverse phase spaces are often encountered in particle accelerators. Flat beams large transverse-emittance ratios critical for future linear colliders. Similarly, magnetized significant expected to enhance performance of electron cooling hadron beams. Preparing these requires precise control and characterization four-dimensional space. In this study, we employ generative phase-space reconstruction techniques rapidly...
Abstract A compact collinear wakefield accelerator has been designed for an X-ray free-electron laser capable of operating at a pulse repetition rate in the tens kilohertz. The maximum achievable accelerating gradient determined, with its limitation linked to beam breakup instability. fabrication techniques principal components including generation, couplers excess power extraction and diagnostics, focusing quadrupoles, novel undulator have discussed. Results from various laboratory...
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...
The generation of a flat electron beam directly from photoinjector is an attractive alternative to the damping ring as envisioned for linear colliders. It also has potential applications light sources such ultra-short x-ray pulses or Smith-Purcell free lasers. In this Letter, we report on experimental flat-beam with measured transverse emittance ratio $100\pm 20.2$ bunch charge $\sim 0.5$ nC; smaller normalized root-mean-square 0.4$ $\mu$m and limited by resolution our setup. data, obtained...
Terahertz (THz) radiation occupies a very large portion of the electromagnetic spectrum and has generated much recent interest due to its ability penetrate deep into many organic materials without damage associated with ionizing such as x-rays. One path for generating copious amount tunable narrow-band THz is based on Smith–Purcell free-electron laser (SPFEL) effect. In this paper we propose simple concept compact two-stage SPFEL operating in super-radiant regime capable radiating at...
Collinear high-gradient ${\cal O} (GV/m)$ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, high accelerating fields need complemented with large transformer ratios $>2$, a parameter characterizing efficiency energy transfer between wakefield-exciting "drive" bunch an accelerated...
We report on the experimental generation of relativistic electron bunches with a tunable longitudinal bunch shape. A bunch-shaping (LBS) beam line, consisting transverse mask followed by transverse-to-longitudinal emittance exchange (EEX) is used to tailor shape (or current profile) bunch. The shapes bunch's horizontal profile, and EEX line converts it corresponding profile. Argonne wakefield accelerator rf photoinjector delivers into LBS generate variety shapes. quality limited various...
Collinear wakefield acceleration has been long established as a method capable of generating ultrahigh gradients. Because the success on this front, recently, more efforts have shifted towards developing methods to raise transformer ratio (TR). This figure merit is defined peak field behind drive bunch deceleration inside bunch. TR always less than 2 for temporally symmetric distributions and therefore recent focused asymmetric overcome limitation. In Letter, we report using...
Electron beams from modern high performance accelerators power intense light sources such as free electron lasers and synchrotron sources, well wakefield-based accelerating modules relying on plasmas or dielectric structures. The way the bunches are shaped in space time controls efficacy of how beam radiates interacts with In this review physics behind methods for controlling mesoscopic electron-bunch properties, i.e., phase-space distributions, an accelerator discussed, both a theoretical...
We report on the successful experimental generation of electron bunches with ramped current profiles. The technique relies impressing nonlinear correlations in longitudinal phase space using a superconducing radiofrequency linear accelerator operating at two frequencies and current-enhancing dispersive section. produced $\sim 700$-MeV have peak currents order kilo-Amp\`ere. Data taken for various settings demonstrate versatility method particular its ability to produce profiles that...
We propose a general method for tailoring the current distribution of relativistic electron bunches. The technique relies on recently proposed to exchange longitudinal phase space emittance with one transverse emittances. consists transversely shaping bunch and then converting its profile into via transverse-to-longitudinal phase-space-exchange beam line. show that it is possible tailor follow, in principle, any desired distributions. demonstrate, computer simulations, application generate...