A5031870889- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Gyrotron and Vacuum Electronics Research
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Laser Design and Applications
- Muon and positron interactions and applications
- Dark Matter and Cosmic Phenomena
- Building energy efficiency and sustainability
- Laser-Matter Interactions and Applications
- Renewable energy and sustainable power systems
- Atomic and Molecular Physics
- Geophysics and Sensor Technology
- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- Quantum Chromodynamics and Particle Interactions
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- X-ray Spectroscopy and Fluorescence Analysis
High Energy Accelerator Research Organization
2013-2024
GTx (United States)
2012
University of Colorado Boulder
2008
Kharkiv Institute of Physics and Technology
2006
National Science Center
2006
Tokyo Metropolitan University
2003
Durham University
2003
Cornell University
2003
Thomas Jefferson National Accelerator Facility
2003
Brunel University of London
2003
$7.6\ifmmode\times\else\texttimes\fi{}{10}^{6}$ 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 have demonstrated for the first time production of highly polarized short-pulse positrons with a finite energy spread in accordance new scheme that consists two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using circularly laser beam 532 nm scattered off high-quality, 1.28 GeV electron beam, we obtained an intensity 2 x 10(4) e+ /bunch. The magnitude positron polarization has been determined to be 73 +/- 15(stat) 19(syst)% by means newly...
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...
GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes are presented as emission sources for highly polarized electron beams. The cathode achieved a maximum polarization of 92(±6)% with quantum efficiency 0.5%, while the provides higher (0.7%) but lower [77(±5)%]. Criteria achieving high using discussed based on experimental spin-resolved spectra.
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
We have observed a large enhancement of the spin polarization electrons extracted from an AlGaAs-GaAs superlattice illuminated by circularly polarized light. A 71.2 \ifmmode\pm\else\textpm\fi{}1.1(stat)\ifmmode\pm\else\textpm\fi{}6.1(sys)% was obtained with photon wavelength 802 nm at room temperature. also confirmed removal degeneracy between heavy-hole band and light-hole \ensuremath{\Gamma} point laser-wavelength dependence polarization.
For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest achieved single-bunch-mode operation of Accelerator Test Facility, which satisfies requirement x-band collider. The emittances were measured with a laser-wire beam-profile monitor installed damping ring. bunch length and momentum spread beam also recorded under same conditions. rms at intensity 4 pm energy 1.3 GeV, corresponds normalized 1.0x1.0(-8)...
Thomson scattering of high-power laser and electron beams is a good test electrodynamics in the high-field region. We demonstrated production high-intensity X-rays head-on collision CO2 60-MeV at Brookhaven National Laboratory, Accelerator Test Facility. The energy an X-ray photon was limited 6.5 keV linear (lowest order) scattering, but nonlinear (higher process produces higher X-rays. measured angular distribution high-energy confirmed that it agrees with theoretical predictions.
X-ray generation based on laser-electron Compton scattering is one attractive method to achieve a compact laboratory-sized high-brightness x-ray source. We have designed, built, and tested such source; it combines 50 MeV multibunch electron linac with mode-locked 1064 nm laser stored amplified in Fabry–Pérot optical cavity. directly observed trains of pulsed x rays using microchannel plate detector; the resultant yield was found be 1.2×105 Hz good agreement prediction. believe that result...
Electron beams with the lowest, normalized transverse emittance recorded so far were produced and confirmed in single-bunch-mode operation of Accelerator Test Facility at KEK. We established a tuning method damping ring which achieves small vertical dispersion x-y orbit coupling. The was less than 1% horizontal emittance. At zero-intensity limit, 2.8 x 10(-8) rad m beam energy 1.3 GeV. high intensity, strong effects intrabeam scattering observed, had been expected view extremely particle...
Based on the requirements from a conceptual design of polarized positron beam for future linear colliders, we constructed special collision system with short focal length 150 mm laser beams so as to produce $\ensuremath{\gamma}$ rays through inverse Compton scattering. In order achieve efficient laser-electron collisions, created optics very small ${e}^{\ensuremath{-}}$-beam sizes ${\ensuremath{\sigma}}_{{e}_{x0}}=7.6\text{ }\ensuremath{\mu}\mathrm{m}$ and...
We report and discuss high-flux generation of circularly polarized γ-rays by means Compton scattering. The γ-ray beam results from the collision an external-cavity-enhanced infrared laser a low emittance relativistic electron beam. By operating non-planar bow-tie high-finesse optical Fabry-Perot cavity coupled to storage ring, we have recorded flux up (3.5 ± 0.3) × 108 photons per second with mean measured energy 24 MeV. has been sustained for several hours. In particular, were able measure...
As part of the positron source R&D for future e+−e− colliders and Compton based compact light sources, a high finesse non-planar four-mirror Fabry-Perot cavity has recently been installed at ATF (KEK, Tsukuba, Japan) [1]. The first measurements gamma ray flux produced with such using pulsed laser is presented here. We demonstrate production 2.7 ± 0.2 rays per bunch crossing ( ∼ 3 × 106 gammas second) during commissioning.
We have developed a polarimetry of ultrashort pulse gamma rays based on the fact that penetrating in forward direction through magnetized iron carry information helicity original rays. Polarized, short-pulse (1.1+/-0.2)x10(6)/bunch with time duration 31 ps and maximum energy 55.9 MeV were produced via Compton scattering circularly polarized laser beam 532 nm off an electron 1.28 GeV. The first demonstration asymmetry measurements was conducted using longitudinally 15 cm length. It is found...
We have studied the polarization of photoemission from an In 0.15 Ga 0.85 As–GaAs strained-layer superlattice. The 82.7±0.3(stat.)±6.1(syst.)% was observed at laser wavelengths 911 to 916 nm room temperature. quantum efficiency wavelength ∼0.015% in vacuum ∼6×10 -10 Torr with high cathode voltage -4 kV.