A5000793302- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Particle Detector Development and Performance
- Laser-induced spectroscopy and plasma
- Terahertz technology and applications
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Plasma Diagnostics and Applications
- Photocathodes and Microchannel Plates
- Chalcogenide Semiconductor Thin Films
- Atomic and Molecular Physics
- Electron and X-Ray Spectroscopy Techniques
- Advanced Optical Sensing Technologies
- Electrostatic Discharge in Electronics
- Quantum Dots Synthesis And Properties
- Photonic and Optical Devices
- Pulsed Power Technology Applications
- Distributed and Parallel Computing Systems
- Photonic Crystals and Applications
- Adaptive optics and wavefront sensing
- Laser Material Processing Techniques
- Copper-based nanomaterials and applications
Brookhaven National Laboratory
2012-2024
University of California, Los Angeles
2018-2020
Particle Beam Lasers (United States)
2018
SLAC National Accelerator Laboratory
2016
Euclid Techlabs (United States)
2016
Office of Basic Energy Sciences
2016
Office of Science
2016
Argonne National Laboratory
2016
Tsinghua University
2016
Shanghai Jiao Tong University
2016
A tunable energy-chirp compensator was used to remove a correlated energy chirp from the 60-MeV beam at Brookhaven National Laboratory Accelerator Test Facility. The operates through interaction of wakefield electron bunch with itself and consists planar structure comprised two alumina bars copper-plated backs separated by an adjustable aperture. By changing gap size, completely removed. Calculations show that this device, properly scaled account for charge length, can be residual spread end...
Inverse Compton scattering of laser photons by ultrarelativistic electron beam provides polarized x- to $\ensuremath{\gamma}$-ray pulses due the Doppler blueshifting. Nonlinear electrodynamics in relativistically intense linearly field changes radiation kinetics established during interaction. These are induced figure-8 motion, which introduces an overall redshift spectrum, with concomitant emission higher order harmonics. To experimentally analyze strong physics associated nonlinear...
We have measured an intense THz radiation produced by a sub-picosecond, relativistic electron bunch in dielectric loaded waveguide. For efficient pulse extraction, the waveguide end was cut at angle. appropriate choice of angle cut, such antenna converts TM01 mode excited into free-space fundamental Gauss-Hermite propagating with respect to beam trajectory. Simulations show that more than 95% energy can be extracted using simple approach. More 40 oscillations about 170 ps long 0.48 signal...
Abstract Laser-driven plasma accelerators provide tabletop sources of relativistic electron bunches and femtosecond x-ray pulses, but usually require petawatt-class solid-state-laser pulses wavelength λ L ~ 1 μ m. Longer- lasers can potentially accelerate higher-quality bunches, since they less power to drive larger wakes in dense plasma. Here, we report on a self-injecting accelerator driven by long-wave-infrared laser: chirped-pulse-amplified CO 2 laser ( ≈ 10 m). Through optical...
We present results of an experiment where, using a 200 GW CO2 laser seed, 65 MeV electron beam was decelerated down to 35 in 54 cm long strongly tapered helical magnetic undulator, extracting over 30$\%$ the initial energy coherent radiation. These demonstrate unparalleled electro-optical conversion efficiencies for relativistic undulator field and represent important step development high peak average power radiation sources.
Photonic structures operating in the terahertz (THz) spectral region enable essential characteristics of confinement, modal control, and electric field shielding for very high gradient accelerators based on wakefields dielectrics. We report here an experimental investigation THz wakefield modes a three-dimensional photonic woodpile structure. Selective control exciting or suppressing with nonzero transverse wave vector is demonstrated by using drive beams varying ellipticity. Additionally,...
Temporal pulse tailoring of charged-particle beams is essential to optimize efficiency in collinear wakefield acceleration schemes. In this Letter, we demonstrate a novel phase space manipulation method that employs beam interaction dielectric structure, followed by bunch compression permanent magnet chicane, longitudinally tailor the shape an electron beam. This compact, passive, approach was used generate nearly linearly ramped current profile relativistic experiment carried out at...
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 Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
We report experimental measurements of narrow-band, single-mode excitation, and drive beam energy modulation, in a dielectric wakefield accelerating structure with planar geometry Bragg-reflector boundaries. A short, relativistic electron ($\ensuremath{\sim}1\text{ }\text{ }\mathrm{ps}$) moderate charge ($\ensuremath{\sim}100\text{ }\mathrm{pC}$) is used to the wakefields structure. The fundamental mode reinforced by constructive interference alternating layers at boundary, characterized...
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.
The generation of X-rays and γ-rays based on synchrotron radiation from free electrons, emitted in magnet arrays such as undulators, forms the basis much modern X-ray science. This approach has drawback requiring very high energy, up to multi-GeV-scale, electron beams, obtain required photon energy. Due limit accelerating gradients conventional particle accelerators, reaching energy typically demands use instruments exceeding 100's meters length. Compact, less costly, monochromatic sources...
We present results of an experiment showing the first successful demonstration a cascaded micro-bunching scheme. Two modulator-chicane pre-bunchers arranged in series and high power mid-IR laser seed are used to modulate 52 MeV electron beam into train sharp microbunches phase-locked external drive laser. This configuration allows increase fraction electrons trapped strongly tapered inverse free (IFEL) undulator 96\%, with up 78\% particles accelerated final design energy yielding...
Inverse Compton scattering (ICS) is a unique mechanism for producing fast pulses - picosecond and below of bright X- to gamma-rays. These nominally narrow spectral bandwidth electromagnetic radiation are efficiently produced in the interaction between intense, well-focused electron laser beams. The characteristics such sources affected by many experimental parameters, as laser, angles both electrons photons at collision. field amplitude induces harmonic generation importantly, present work,...
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.
A high-resolution, low-latency beam position monitor (BPM) system has been developed for use in particle accelerators and lines that operate with trains of bunches bunch separations as low several tens nanoseconds, such future linear electron-positron colliders free-electron lasers. The was tested electron beams the extraction line Accelerator Test Facility at High Energy Research Organization (KEK) Japan. It consists three stripline BPMs instrumented analogue signal-processing electronics a...
Disentangling the primary order parameter from secondary parameters in phase transitions is critical to interpretation of transition mechanisms strongly correlated systems and quantum materials. Here we present a study structural pathways superionic Cu2S nanocrystals that exhibit intriguing properties. Utilizing ultrafast electron diffraction techniques sensitive both momentum-space time-domain, distinguish dynamics crystal symmetry breaking lattice expansion this system. We are able follow...
The capability of accelerating electron bunches at high repetition rate is one the key performance criteria for all average power particle accelerator applications. High gradient laser-driven acceleration holds potential greatly reducing size and costs future machines, but typically requires very peak laser powers. On other hand, MHz pulse trains TW-class beams are much beyond state art, so that recycling recirculation a necessary step to bridge gap. In this experiment we demonstrate first...
We present the design of FONT4 intra-train beam-based digital position feedback system prototype. The incorporates a fast analogue beam monitor front-end signal processor, board, and kicker-driver amplifier. latency goal is less than 150 ns. report preliminary results tests at accelerator test facility (ATF) KEK using electron bunches separated by c.