A5062481978- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Advancements in Photolithography Techniques
- Power System Optimization and Stability
- Photocathodes and Microchannel Plates
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Vibration and Dynamic Analysis
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Cardiac Imaging and Diagnostics
- International Science and Diplomacy
- Optical Systems and Laser Technology
- Optimal Power Flow Distribution
Nagoya Institute of Technology
2024
High Energy Accelerator Research Organization
2010-2021
The Graduate University for Advanced Studies, SOKENDAI
2016-2021
European Organization for Nuclear Research
2014-2016
Kyoto University
1987-2011
Foundation for Biomedical Research and Innovation
2011
Mitsubishi Heavy Industries (Germany)
2011
Cornell University
2007
Stanford Synchrotron Radiation Lightsource
1995-2002
Stanford University
1995-2002
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...
ILC (International Linear Collider) is under consideration as the next global project of particle physics. Its Technical Design Report, published in 2013, describes accelerator for center-of-mass energies above 200GeV. The operation at lower has not been studies intensively. This report discusses a 91.2GeV and presents possible parameter set.
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)...
We derive completely integrated formulas for emittance growth times due to intrabeam scattering charged particle beams in the high energy limit, including effect of lattice parameters that vary around accelerator ring. Using lattices prototype damping ring called Accelerator Test Facility at KEK and those two proposed International Linear Collider rings, we compare our results with other calculations.
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.
A calculation method of emittance growth an electron beam due to intrabeam scattering is described. The 3 degrees freedom are equally treated in the rest frame, and couplings between them included a natural way. This formalism suitable for with beam-envelope method.
Research is under way at SLAC to develop accelerator structure for a next generation linear collider. A full-scale prototype $X$-band has been built in which the dipole mode frequencies were detuned suppress long-range transverse wake field by about 2 orders of magnitude. To verify that detuning works as expected, facility, Accelerator Structure Setup, was constructed Linear Collider measure field. This Letter presents results from measurement with this facility.
The International Linear Collider (ILC) damping ring (DR) injection and extraction kickers have a very special role: the bunch spacing 189--480 ns is compressed to 3--9 when injected into DR then decompressed leaving DR. act as bunch-by-bunch beam manipulator compress decompress into/from They require fast rise/fall time (3--9 ns) high repetition rate (6--2 MHz). Among candidate technologies, multiple strip-line kicker system most likely realize specifications for ILC reference design. A...
We derive a simple relation for estimating the relative emittance growth in $x$ and $y$ due to intrabeam scattering (IBS) electron storage rings. show that IBS calculations Accelerator Test Facility (ATF) damping ring, when using formalism of Bjorken-Mtingwa, modified Piwinski (where ${\ensuremath{\eta}}^{2}/\ensuremath{\beta}$ has been replaced by $H$), or high-energy approximate formula all give results agree well. Comparing theory, including effect potential well bunch lengthening, with...
In this paper, the linear and second order optics corrections for KEK Accelerator Test Facility (ATF2) final focus beam line are described. The of ATF2 is designed based on a local chromaticity correction scheme similar to ILC system. Beam measurements in 2012 revealed skew sextupole field errors that were much larger than expected from magnetic measurements. error was critical limitation size at virtual interaction point (IP). Therefore, four magnets installed correct August 2012. By using...
A search for sequential charged leptons decaying into massive neutrinos has been performed at ${E}_{\mathrm{c}.\mathrm{m}.}=56$ GeV the KEK colliding-beam accelerator TRISTAN. We have found no evidence production of heavy an integrated luminosity 5.3 ${\mathrm{pb}}^{\ensuremath{-}1}$. stable was also conducted yielding null results. new mass limit on obtained as a function associated neutrinos.
In linear accelerators, the transverse beam orbit is induced by tilts of accelerating cavities (deviation field direction from designed direction) and offset quadrupole magnets. Estimating emittance growth due to such random errors important for evaluation performance linacs, especially where stable low required, as colliders. Usually, estimations are performed using tracking simulations, including Monte Carlo method, which tends take a long time. Here, much faster simpler method...
We describe in this paper a measurement of vertical emittance the Accelerator Test Facility (ATF) damping ring at KEK with laser wire beam profile monitor. This monitor is based on Compton scattering process electrons light target which produced by injecting cw into Fabry-Perot optical cavity. installed straight section and measured three different conditions. In all cases, ATF was operated 1.28 GeV single bunch mode. When tuned for ultralow emittance,...
A result of the search for top quark in e + - annihilation into hadrons at \(\sqrt{s}=50\) GeV is presented. The experiment has been perforrnxed using VENUS detector TRISTAN. No evidence found production quark. From study event shape multihadron events, upper limit cross section to be 16 pb thcc 95% confidence level.
The Accelerator Test Facility 2 (ATF2) aims to test the novel chromaticity correction scheme which is implemented in final focus systems of future linear colliders such as International Linear Collider (ILC) and Compact (CLIC). ATF2 nominal ultralow ${\ensuremath{\beta}}^{*}$ lattices are designed vertically beam at focal point, or usually referred interaction point (IP), down 37 23 nm, respectively. vertical chromaticities comparable those ILC CLIC, When measured multipole components...
In circular colliders, as well in damping rings and synchrotron radiation light sources, beam halo is one of the critical issues limiting performance potentially causing component damage activation. It imperative to clearly understand mechanisms that lead formation test available theoretical models. Elastic beam-gas scattering can drive particles large oscillation amplitudes be a potential source halo. this paper, numerical estimation Monte Carlo simulations process at ATF KEK are presented....