A5069814199- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Laser Design and Applications
- Photocathodes and Microchannel Plates
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Muon and positron interactions and applications
- Advanced Surface Polishing Techniques
- Photonic and Optical Devices
- Terahertz technology and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
- Laser-Plasma Interactions and Diagnostics
- Particle physics theoretical and experimental studies
- Laser-induced spectroscopy and plasma
- Spectroscopy and Laser Applications
- Advancements in Photolithography Techniques
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Distributed and Parallel Computing Systems
- Chalcogenide Semiconductor Thin Films
Thomas Jefferson National Accelerator Facility
2003-2024
Oak Ridge National Laboratory
2023
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2023
Universidad de Guanajuato
2023
Autonomous University of Sinaloa
2023
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
This review paper describes the energy-upgraded Continuous Electron Beam Accelerator Facility (CEBAF) accelerator. superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing 88 cavities that have operated cw at an average accelerating gradient of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>20</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>MV</a:mi><a:mo>/</a:mo><a:mi...
This contribution describes the latest milestones of a multiyear program to build and operate compact $\ensuremath{-}300\text{ }\text{ }\mathrm{kV}$ dc high voltage photogun with inverted insulator geometry alkali-antimonide photocathodes. Photocathode thermal emittance measurements quantum efficiency charge lifetime at average current up 4.5 mA are presented, as well an innovative implementation ion generation tracking simulations explain benefits biased anode repel beam line ions from...
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;...
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.
Recent work at Jefferson Lab has demonstrated the viability of same-cell energy recovery as a basis for high average power free-electron laser (FEL). We are now extending this technique to lase powers in excess 10 kW infrared. This upgrade will also produce over 1 UV and generate brightness Thomson back-scattered X-rays. The increase be achieved by increasing electron beam factor four, current FEL design efficiency two. Utilization near-concentric optical cavity is enabled use very low loss...
We present experiments and simulations showing the behavior of a free-electron laser (FEL) with both positive negative linear tapers along wiggler. show power desynchronism curve widths, efficiency, exhaust electron energy spread, wavelength dependence as function taper for 3- 6-microm optical wavelengths resonators 10% 2% loss/pass. Simulations experiments, using multimode analysis, are seen to be in general agreement experimental results, carried out at IR Demo FEL Thomas Jefferson...
In 2012 Jefferson Laboratory's energy recovery linac (ERL) driven Free Electron Laser successful completed a transmission test in which high current CW beam (4.3 mA at 100 MeV) was transported through 2 mm aperture for 7 hours with losses as low 3 ppm. The purpose of the run to mimic an internal gas target DarkLight* - experiment designed search dark matter particle. ERL not again until late 2015 brief re-commissioning preparation next phase DarkLight. intervening years, FEL rebranded Low...
A Free Electron Laser (FEL) called the IR Demo is operational as a user facility at Thomas Jefferson National Accelerator Facility in Newport News, Virginia, USA. It utilizes 48 MeV superconducting accelerator that not only accelerates beam but also recovers about 80% of electron–beam power remains after FEL interaction. Utilizing this recirculation loop machine has recovered cw average currents up to 5 mA, and lased above 2 kW output 3.1 microns. capable 1 6 micron range can produce ∼0.7 ps...