A5084521952- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Photocathodes and Microchannel Plates
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Structural Analysis and Optimization
- X-ray Spectroscopy and Fluorescence Analysis
- Particle physics theoretical and experimental studies
- Bacteriophages and microbial interactions
- Advanced Data Storage Technologies
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Laser-Matter Interactions and Applications
- Muon and positron interactions and applications
- Planetary Science and Exploration
- Plant Virus Research Studies
- Engineering Applied Research
- Ocular and Laser Science Research
- Radio Frequency Integrated Circuit Design
- Radio Astronomy Observations and Technology
Brookhaven National Laboratory
2006-2018
Johns Hopkins University
2011
RIKEN BNL Research Center
2003-2007
Stanford Synchrotron Radiation Lightsource
2006
National Synchrotron Light Source II
2003-2006
Relativistic Heavy Ion Collider
2002
Northrop Grumman (United States)
1989
Mars Space (United Kingdom)
1986
Argonne National Laboratory
1980
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.
Abstract We use the Very Energetic Radiation Imaging telescope Array System (VERITAS) imaging air Cherenkov array to obtain first measured angular diameter of β UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain limb-darkened diameter. The age Ursa Major moving group has been assessed from ages its members, including nuclear member Merak ( UMa), an A1-type subgiant, by comparing effective temperature luminosity constraints model evolution...
In this Letter we report the first experimental characterization of superradiance in a single-pass high-gain free-electron laser (FEL) seeded by 150 femtosecond (FWHM) Ti:sapphire laser. The nonlinear energy gain after an exponential regime was observed. We also measured evolution longitudinal phase space both and superradiant regimes. output FEL pulse duration to be as short 81 fs, roughly 50% reduction compared input seed temporal distribution radiation predicted numerical simulation...
Measurements of the thermal emittance an electron beam produced by photoemission from copper cathode a high power RF cavity are presented. The RMS normalized has been measured as function laser spot size, applied surface field, and polarization at normal incidence. Local field enhancement due to effects is found increase substantially beyond that expected for perfect planar surface.
Commissioning of two large coherent light facilities (XFELs) at SLAC and DESY should begin in 2008 2011, respectively. In this paper we look further into the future, hoping to answer, a very preliminary way, questions. First: What will next generation XFEL like? Believing that superconducting technology offers advantages such as high quality beams with highly populated bunches, possibility energy recovery higher overall efficiency than warm technology, focus study on option. From belief...
The DUVFEL electron linac is designed to produce sub-picosecond, high brightness bunches for driving a short wavelength FEL. Four experiments have been commissioned address the challenge of accurately measuring bunch lengths on this timescale. In frequency domain, 12 period undulator used both off-axis coherent emission and on-axis incoherent single-shot spectra. total infrared power scales inversely with length spectral cutoff an indication length. density spikes in visible spectrum may...
Saturation of a high-gain harmonic-generation free-electron laser (HGHG-FEL) at 266 nm has been accomplished the Brookhaven National Laboratory/Deep Ultra Violet Free Electron Laser Facility (BNL/DUV-FEL) by seeding with an 800 Ti:sapphire laser. We describe diagnostics used to characterize electron beam and FEL output. Analytic simulation calculations HGHG output are presented compared experimental data. also discuss chirped pulse amplification frequency seed energy beam. The third harmonic...
We describe a major paradygm shift in the approach to production of synchrotron radiation This change will considerably improve scientific capabilities light sources. introduce plans for an upgrade National Synchrotron Light Source (NSLS). be based on Photoinjected Energy Recovering Linac (PERL). machine emerges from union two technologies, laser-photocathode RF gun (photoinjector) and superconducting linear accelerators with beam energy recovery (Energy Linac). The bring NSLS users many new...
Beam intensity is a key performance parameter for particle accelerators. Modern high-performance storage rings demand injectors that can deliver large currents per injection cycle, which translates to an increase in machine size and consumed power. Therefore, it justifiable look ways the injector's while minimizing increase. We have investigated number of accumulate charge booster synchrotron applied one them NSLS-II booster. designed scheme transversely stack two bunch trains from injector...
Beam loading in traveling-wave linear accelerating structures leads to unacceptable spread of particle energies across an extended train bunched particles due beam-induced field and dispersion. Methods for modulating the rf power driving linacs are effective at reducing energy spread, but general do not have a clear analytic foundation. We report here methods calculating how modulate drive arbitrarily nonuniform within convective-transport (power-diffusion) model that results no additional...
We use the VERITAS imaging air Cherenkov Telescope (IACT) array to obtain first measured angular diameter of $β$ UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain limb-darkened diameter. The age Ursa Major moving group has been assessed from ages its members, including nuclear member Merak ($β$ UMa), an A1-type subgiant, by comparing effective temperature luminosity constraints model evolution tracks. Previous interferometric angular-diameter...
We present the conceptual design of NSLS-II injection system [1, 2]. The consists a low-energy linac, booster and transport lines. review two different configurations; located in storage ring tunnel housed separate building. briefly discuss main parameters layout components.