A5061952553- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Radiotherapy Techniques
- Crystallography and Radiation Phenomena
- Advanced Power Generation Technologies
- Photocathodes and Microchannel Plates
- Atomic and Subatomic Physics Research
- High Temperature Alloys and Creep
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- VLSI and FPGA Design Techniques
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Geophysics and Sensor Technology
- Superconducting Materials and Applications
- VLSI and Analog Circuit Testing
- Heat transfer and supercritical fluids
- Intermetallics and Advanced Alloy Properties
- Advanced X-ray and CT Imaging
- Photonic and Optical Devices
- Advanced Electron Microscopy Techniques and Applications
High Energy Accelerator Research Organization
2013-2025
SLAC National Accelerator Laboratory
2023
The Graduate University for Advanced Studies, SOKENDAI
2020
Kiryu University
2017-2019
Gunma University
2017-2019
National Institute for Materials Science
2009-2010
Material (Belgium)
2010
National Institutes for Quantum Science and Technology
2006-2008
Keio University
2006-2007
Toshiba (Japan)
1997-2007
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 high-current, long-pulsed beam operation without loss was demonstrated at the Superconducting rf Test Facility (STF) of High Energy Accelerator Research Organization. The primary purpose STF to validate superconducting radio-frequency (rf) acceleration technology for International Linear Collider (ILC) using accelerator components in line with ILC design. Thus, most critical objective perform operations a pulse length (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
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...
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)...
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...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
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...
At the laser undulator compact x-ray source at KEK, our group has designed and built a new rf gun with larger mode separation of 8.6 MHz higher $Q$ value than earlier guns. This paper presents details on design fabrication, low-power measurements, tuning procedures followed in fabrication cavity. We also give detailed account experiments performed this present measurement results. have successfully generated 100 bunches per train 50 nC charge 41 MeV 300 160 5 MeV, low peak-to-peak energy...
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...
A laser-wire transverse electron beam size measurement system has been constructed and operated at the Accelerator Test Facility (ATF) extraction line KEK. The construction of is described in detail along with environment ATF related to laser wire. special set optics was developed generate an approximately $1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ vertical focus location. results our operation are presented, where a minimum rms $4.8\ifmmode\pm\else\textpm\fi{}0.3\text{ measured, smaller...
The development of EDA tools for analog IC design which increase designers' productivity is an urgent need. Conventional require recalculating every time required specification changes. In this paper, a prediction method element values OP Amp the specifications using deep learning proposed. proposed can learn relation between performances and target circuit. Simulation results indicate that has succeeded in predicting 7 satisfies 13 with accuracy 93% average.
The mid-infrared range is an important spectrum where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) promising candidate for high-power light source with wavelength tunability investigate the nonlinear of materials. Although self-amplification spontaneous emission (SASE) scheme not usually adopted in range, it may have advantages such as layout simplicity, possibility producing single pulse, and scalability short-wavelength...