A5032852964- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Photocathodes and Microchannel Plates
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Advanced Surface Polishing Techniques
- Adaptive optics and wavefront sensing
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Electron and X-Ray Spectroscopy Techniques
- Spectroscopy and Laser Applications
- Advancements in Photolithography Techniques
- Nuclear Physics and Applications
- Laser Material Processing Techniques
- Orbital Angular Momentum in Optics
- Magneto-Optical Properties and Applications
- Particle physics theoretical and experimental studies
- Solid State Laser Technologies
- Magnetic confinement fusion research
Thomas Jefferson National Accelerator Facility
2014-2024
Argonne National Laboratory
2023-2024
Brookhaven National Laboratory
2021
Fermi National Accelerator Laboratory
2008-2019
Northern Illinois University
2019
Air Vehicle Integrated Design (United States)
2007-2010
Stanford University
1980-2005
Duke University
1989-2005
K Lab (United States)
2002
Continuous Electron Beam Accelerator Facility
1993-1996
Using automated laser-Doppler methods we have identified four distinct sequences of instabilities leading to turbulent convection at low Prandtl number (2·5–5·0), in fluid layers small horizontal extent. Contour maps the structure time-averaged velocity field, conjunction with high-resolution power spectral analysis, demonstrate that several mean flows are stable over a wide range Rayleigh R, and sequence time-dependent depends on flow. A routes non-periodic motion been by varying...
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
We have measured the full spectrum of third-order optical susceptibiltiy, ${\ensuremath{\chi}}^{(3)}$(\ensuremath{\omega}), in polyacetylene using an infrared free-electron laser. The magnitude ${\ensuremath{\chi}}^{(3)}$(\ensuremath{\omega}) reaches \ensuremath{\sim}${10}^{\mathrm{\ensuremath{-}}8}$ esu at 0.6 eV, largest value electronic inside gap a semiconductor. There are two peaks and 0.89 eV that assigned to three- two-photon resonance enhancements, respectively, implying states...
It has long been known that gain exists at the odd harmonics of a free-electron laser. Using dispersive intracavity element to alter cavity lengths for fundamental and harmonic lasing, we have demonstrated lasing between 1.4 1.8 \ensuremath{\mu}m using Stanford Mark III infrared Gain third was seen agree with theory within experimental limits. The wavelength not quite equal one due saturation bandwidth effects. Power output somewhat smaller than expected. This may losses in optical transport system.
The width of the picosecond optical pulses produced in Stanford University 3-\ensuremath{\mu}m free-electron laser has been measured by using autocorrelation techniques. pulse was as a function cavity length detuning and compared with linewidth. are nearly transform limited somewhat shorter than expected at large values detuning.
We describe a procedure for the simulation of free-electron-laser (FEL) oscillators. The uses combination MEDUSA code FEL interaction and OPC to model resonator. simulations are compared with recent observations oscillator at Thomas Jefferson National Accelerator Facility in substantial agreement experiment.
The Jefferson Lab (JLab) 10 kW IR Upgrade FEL DC GaAs photocathode gun is presently the highest average current electron source operational in U.S., delivering a record 9.1 mA CW, 350 kV beam with 122 pC/bunch at 75 MHz rep rate. Pulsed operation has also been demonstrated 8 per pulse (110 pC/bunch) 16 ms-long pulses 2 Hz Routinely delivers 5 CW and 135 for operations. direct evolution of used previous JLab 1 Demo FEL. Improvements vacuum conditions, incorporation two UHV motion mechanisms...
Operation of the JLab IR Upgrade FEL at CW powers in excess 10 kW requires sustained production high electron beam by driver ERL. This turn demands attention to numerous issues and effects, including: cathode lifetime; control beamline RF system vacuum during current operation; longitudinal space charge; transverse matching irregular/large volume phase distributions; halo management; management remnant dispersive effects; resistive wall, wake-field, heating chambers; break up instability;...
The development of superconducting radio frequency (SRF) accelerator technology for CEBAF's nuclear physics program set the stage its application to a number other efforts. We describe below major advance in Free Electron Laser (FEL) Technology based on SRF linacs. Jefferson Lab efforts achieved three orders magnitude increase power delivered by FELs and firmly established viability energy recovering linac technology. details engineering challenges addressed accomplish this effort then...
We give a short overview of the DarkLight detector concept which is designed to search for heavy photon A' with mass in range 10 MeV/c^2 < m(A') 90 and decays lepton pairs. describe intended operating environment, Jefferson Laboratory free electon laser, way extend DarkLight's reach using --> invisible decays.
High-power, relativistic electron beams from energy-recovering linacs have great potential to realize new experimental paradigms for pioneering innovation in fundamental and applied research. A major design consideration this generation of capabilities is the understanding halo associated with these bright, intense beams. In Letter, we report on measurements performed using 100 MeV, 430 kW cw beam linac at Jefferson Laboratory's Free Electron Laser facility as it traversed a set small...
We have produced and measured for the first time second harmonic oscillation in infrared region by a free electron laser. Although such lasing is ideally forbidden, since gain of plane wave zero on axis an beam perfectly aligned with wiggler, transverse mode antisymmetry allows sufficient this experiment to occur. lased at pulse rates up 74.85 MHz could produce over 4.5 W average 40 kW peak IR power nm FWHM bandwidth 2925 nm. In agreement predictions, source preferentially TEM01 mode.
DC high voltage photoemission electron guns with GaAs photocathodes have been used to produce polarized beams for nuclear physics experiments about 3 decades great success. In the late 1990s, Jefferson Lab adopted this gun technology a free laser (FEL), but assist bunch charge operation, considerably higher bias is required compared photoguns at Continuous Electron Beam Accelerator Facility. The FEL has conditioned above 400 kV several times, albeit encountering non‐trivial challenges...