A5053051063- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Photocathodes and Microchannel Plates
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Electron and X-Ray Spectroscopy Techniques
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- Semiconductor materials and devices
- Spectroscopy and Laser Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Distributed and Parallel Computing Systems
- Nuclear Physics and Applications
- Advanced Fiber Laser Technologies
- Physics of Superconductivity and Magnetism
- Advanced Surface Polishing Techniques
- High-Energy Particle Collisions Research
Stony Brook University
2014-2024
Brookhaven National Laboratory
2013-2023
Brookhaven College
1993-2019
Cornell University
2018
Tech-X Corporation (United States)
2007-2017
European Organization for Nuclear Research
2017
Lawrence Berkeley National Laboratory
2017
RIKEN BNL Research Center
1999-2016
Accelerator Test Facility
1998-2016
Advanced Energy Systems (United States)
2008-2010
The physics programme and the design are described of a new collider for particle nuclear physics, Large Hadron Electron Collider (LHeC), in which newly built electron beam 60 GeV, up to possibly 140 energy collides with intense hadron beams LHC. Compared HERA, kinematic range covered is extended by factor twenty negative four-momentum squared, $Q^2$, inverse Bjorken $x$, while luminosity $10^{33}$ cm$^{-2}$s$^{-1}$ LHeC projected exceed integrated HERA two orders magnitude. devoted an...
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...
The Large Hadron electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) energy and intensity frontier particle physics. Exploiting recovery technology, it collides a novel, intense beam with proton or ion from High Luminosity--Large (HL-LHC). accelerator interaction region are for concurrent electron-proton proton-proton operation. This report represents an update Conceptual Design Report (CDR) LHeC, published in 2012. It comprises new results on parton...
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...
We report the measurement of very short, high-brightness bunches electrons produced in a photocathode rf gun with no magnetic compression. The electron beam bunch length and charge distribution along were measured by passing energy chirped through momentum selection slit while varying phase linac. compression as function electric field at cathode investigated. shortest is 370\ifmmode\pm\else\textpm\fi{}100 fs (at 95% charge) 2.5\ifmmode\times\else\texttimes\fi{}${10}^{8}$ (170 A peak...
Nonlinear harmonic radiation was observed using the VISA self-amplified, spontaneous emission (SASE) free-electron laser (FEL) at saturation. The gain lengths, spectra, and energies of three lowest SASE FEL modes were experimentally characterized. measured nonlinear lengths center spectral wavelengths decrease with number, n, which is consistent theory. Both second third harmonics are about 1% fundamental energy. These experimental results demonstrate for first time feasibility to produce...
A free relativistic electron in an electromagnetic field is a pure case of light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with beams produced from particle accelerators. The process single photon absorption and reemission electron, so-called linear Thomson scattering, results radiation that Doppler shifted into x-ray gamma-ray regions. At elevated intensity, nonlinear effects should come play when transverse motion...
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,...
An unstable magnetron RF source for driving an accelerator cavity at high power is stabilized using ferroelectric fast reactive tuning. The output converted to a selected reference frequency with negligible insertion loss. conversion achieved by modulating the magnetron's frequency, such that modulation converts exact frequency. method also allows simultaneous amplitude and phase control.
A fast and highly efficient frequency modulation at a high power level is described. The system incorporates ferroelectric phase shifters magic-T or circulator. magnetron may be considered as potential application. output converted to selected reference with negligible insertion loss. method also allows simultaneous amplitude control.
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...
The beam matrix of a picosecond long slice an electron bunch was measured. A short is selected out energy chirped by slit in dispersive region. emittance measured using the quadrupole scan technique. We observe process compensation repeating measurement for various values compensating solenoid and several slices.
Free-electron lasers and energy recovery linacs represent a new generation of ultra-high brightness electron accelerator based x-ray sources. Photocathodes are critical performance-limiting component these systems. Here, we describe the development photocathodes on potassium-cesium-antimonide that satisfy many key requirements future light sources, such as robustness, high quantum efficiency when excited with visible light, low transverse emittance.
Alkali-antimonide photocathodes were grown on Si(100) and studied by means of XPS UHV-AFM to validate the growth procedure morphology this material. The elements evaporated sequentially at elevated substrate temperatures (first Sb, second K, third Cs). generated intermediate K-Sb compound itself is a photocathode composition K2.4Sb close favored K3Sb stoichiometry. After cesium deposition, surface layer enriched. determined rms roughness 25 nm results in domination emittance photoinjector...
Alkali antimonides have a long history as visible-light-sensitive photocathodes. This work focuses on the process of fabrication bi-alkali photocathodes, K2CsSb. In-situ synchrotron x-ray diffraction and photoresponse measurements were used to monitor phase evolution during sequential photocathode growth mode Si(100) substrates. The amorphous-to-crystalline transition for initial antimony layer was observed at film thickness 40 Å . crystalline structure dissolved upon potassium deposition,...
Cooling of beams gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and opens possibility this technique higher energies than possible electrostatic acceleration beams. The challenges include generation suitable for cooling, delivery required quality to cooling sections without degradation beam angular divergence energy spread,...