A5080324950- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Laser-Matter Interactions and Applications
- Radiation Therapy and Dosimetry
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Advancements in Photolithography Techniques
- Advanced Surface Polishing Techniques
- Electric Motor Design and Analysis
- Nuclear Physics and Applications
- Non-Destructive Testing Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic Field Sensors Techniques
- Microwave Engineering and Waveguides
- Welding Techniques and Residual Stresses
- Vacuum and Plasma Arcs
- Electromagnetic Launch and Propulsion Technology
Brookhaven National Laboratory
2014-2024
Thomas Jefferson National Accelerator Facility
2021
Accelerator Test Facility
2016
European Organization for Nuclear Research
2015
RIKEN BNL Research Center
1999-2011
University of California, Los Angeles
2003
National Synchrotron Light Source II
2002-2003
Supercon (United States)
2002
Lawrence Berkeley National Laboratory
2002
Stanford Synchrotron Radiation Lightsource
2002
A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded to produce amplified, longitudinally coherent, Fourier transform-limited output at harmonic of the seed laser. carbon dioxide wavelength 10.6 micrometers produced saturated, amplified second-harmonic wavelength, 5.3 micrometers. The experiment verifies theoretical foundation for technique and prepares way application this in vacuum ultraviolet region spectrum, with ultimate goal extending...
We report the first experimental results on a high-gain harmonic-generation (HGHG) free-electron laser (FEL) operating in ultraviolet. An 800 nm seed from Ti:sapphire has been used to produce saturated amplified radiation at 266 third harmonic. The confirm predictions for HGHG FEL operation: stable central wavelength, narrow bandwidth, and small pulse-energy fluctuation.
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
$7.6\ifmmode\times\else\texttimes\fi{}{10}^{6}$ x-ray photons per 3.5 ps pulse are detected within a 1.8--2.3 \AA{} spectral window during proof-of-principle laser synchrotron source experiment. A 600 MW ${\mathrm{CO}}_{2}$ interacted in head-on collision with 60 MeV, 140 A, electron beam. Both beams were focused to $\ensuremath{\sigma}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}32\ensuremath{\mu}\mathrm{m}$ spot. Our next plan is demonstrate ${10}^{10}$ using of...
Continuous-wave photoinjectors operating at high accelerating gradients promise to revolutionize many areas of science and applications. They can establish the basis for a new generation monochromatic x-ray free electron lasers, high-brightness hadron beams, or microchip production. In this Letter we report on record-performing superconducting rf gun with ${\mathrm{CsK}}_{2}\mathrm{Sb}$ photocathode. The is generating charge bunches (up $10\text{ }\text{ }\mathrm{nC}/\text{bunch}$) low...
Abstract High brightness, high charge electron beams are critical for a number of advanced accelerator applications. The initial emittance the beam, which is determined by mean transverse energy (MTE) and laser spot size, one most important parameters determining beam quality. bialkali photocathodes illuminated visible have advantages quantum efficiency (QE) low MTE. Furthermore, Superconducting Radio Frequency (SRF) guns can operate in continuous wave (CW) mode at accelerating gradients,...
Superlattice GaAs photocathodes are vital for producing polarized electron beams the Electron-Ion Collider (EIC) at Brookhaven National Laboratory. The pre-injector EIC requires a 7 nC bunch with least 85% spin polarization from GaAs-based superlattice cathode. doping density of very surface layer cathode needs to be optimized extract high charge beam high-voltage DC gun. axis emitted is longitudinal, and it will rotated transverse direction using two Wien filters, each rotating by 45...
Staging of two laser-driven, relativistic electron accelerators has been demonstrated for the first time in a proof-of-principle experiment, whereby distinct and serial laser acted on an beam coherently cumulative manner. Output from ${\mathrm{CO}}_{2}$ was split into beams to drive inverse free lasers (IFEL) separated by 2.3 m. The IFEL served bunch electrons $\ensuremath{\sim}3\mathrm{fs}$ microbunches, which were rephased with wave second IFEL. This represents crucial step towards...
We report on an experimental investigation characterizing the output of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) at saturation. A seed CO2 wavelength 10.6 microm was used to generate amplified FEL 5.3 microm. Measurement frequency spectrum, pulse duration, and correlation length verified that light is longitudinally coherent. Investigation electron energy distribution harmonic energies provides evidence for saturated HGHG operation.
An electron beam microbunched on the optical wavelength scale of $\ensuremath{\approx}2.5\ensuremath{\mu}\mathrm{m}$ by an inverse free laser accelerator was observed. The optimum bunching achieved for a 1% energy modulation 32 MeV with 0.5 GW ${\mathrm{CO}}_{2}$ power. microbunching process investigated measuring coherent transition radiation produced modulated beam. A quadratic dependence signal charge observed shortest is less than $2.5\ensuremath{\mu}\mathrm{m}$. debunching...
Laser-driven electron accelerators (laser linacs) offer the potential for enabling much more economical and compact devices. However, development of practical efficient laser linacs requires accelerating a large ensemble electrons together ("trapping") while keeping their energy spread small. This has never been realized before any acceleration system. We present here first demonstration high-trapping efficiency narrow via acceleration. Trapping efficiencies up to 80% spreads down 0.36% (1...
We proposed a novel design for compact superconducting crab cavity with double quarter wave (DQWCC) shape. After fabrication and surface treatments, this niobium proof-of-principle was tested cryogenically in vertical cryostat. The is extremely yet has low frequency of 400 MHz, an essential property service the Large Hadron Collider luminosity upgrade. cavity's electromagnetic properties are well suited demanding task. demonstrated deflecting voltage 4.6 MV above required 3.34 future High...
VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within single-pass 4-m undulator. The experiment was performed the Accelerator Test Facility BNL, using high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding total of 2 x 10(8) saturation. FEL performance, including spectral, angular, and statistical properties radiation, characterized...
The high intensity polarized electron source is a critical component for future nuclear physics facilities. electron-ion collider requires gun with higher voltage and bunch charge compared to any existing source. At Brookhaven National Laboratory, we have built an inverted direct current (HVDC) photoemission large cathode size. We report on the performance of GaAs photocathodes in gradient up 16 nC charge. measurements were performed at stable operating gap 300 kV—demonstrating outstanding...
The polarized electron source is a critical component in accelerator facilities such as the electron–ion collider, which requires gun with higher voltage and bunch charge than existing sources. One challenge we faced was surface limit of distributed Bragg reflector GaAs/GaAsP superlattice (DBR-SL-GaAs) photocathode. We suppressed this effect by optimizing doping heat cleaning procedures. achieved up to 11.6 nC beam. In report, discuss performance tests DBR-SL-GaAs photocathode high direct...
Strain localization in the presence of a stress gradient is phenomenon common to many systems described by continuum mechanics. Variations this complex lead interesting nonlinear effects materials/engineering science as well other fields. Here, synchrotron based energy dispersive x-ray diffraction (EDXRD) technique used for high spatial resolution profiling both compression and tension induced strain important problems. Specifically, shot peened materials plastic zones adjoining faces...