A5058332854- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Particle Detector Development and Performance
- Photocathodes and Microchannel Plates
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear physics research studies
- Advancements in Photolithography Techniques
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Solid State Laser Technologies
- Photonic and Optical Devices
- Electron and X-Ray Spectroscopy Techniques
- Optical Systems and Laser Technology
- Plasma Diagnostics and Applications
- X-ray Diffraction in Crystallography
- Advanced Optical Sensing Technologies
High Energy Accelerator Research Organization
2015-2024
SLAC National Accelerator Laboratory
2023
Tohoku University
2013-2023
RIKEN Nishina Center
2023
The Graduate University for Advanced Studies, SOKENDAI
2015-2021
Nagoya University
2009-2019
Institute of Nuclear Physics, Polish Academy of Sciences
2019
National Institutes for Quantum Science and Technology
2019
Nagoya University Hospital
2014
Semiconductor Energy Laboratory (Japan)
2014
In this paper, percent vegetation cover is estimated from indices using simulated Advanced Very High Resolution Radiometer (AVHRR) data derived in situ spectral reflectance data. Spectral measurements were conducted on grasslands Mongolia and Japan. Vegetation such as the normalized difference, soil-adjusted, modified soil-adjusted transformed (NDVI, SAVI, MSAVI TSAVI) calculated of various covers. Percent was pixel values red, green blue bands digitized colour photographs. Relationships...
Two-component adlayers consisting of zinc(II) phthalocyanine (ZnPc) and a metalloporphyrin, such as octaethylporphyrin (ZnOEP) or tetraphenylporphyrin (ZnTPP), were prepared by immersing either an Au(111) Au(100) substrate in benzene solution containing those molecules. The bimolecular thus investigated 0.1 M HClO4 cyclic voltammetry (CV) electrochemical scanning tunneling microscopy (EC-STM). A supramolecularly organized "chessboard" structure was formed for the ZnPc ZnOEP array on Au(111),...
We present a precision analysis of the $^{136}$Xe two-neutrino $\beta\beta$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with KamLAND-Zen experiment. An improved formalism for rate allows us to measure ratio leading and subleading $2\nu\beta\beta$ nuclear matrix elements (NMEs), $\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$. Theoretical predictions from shell model majority quasiparticle random-phase approximation (QRPA) calculations are consistent experimental limit....
We successfully performed electron scattering off unstable nuclei which were produced online from the photofission of uranium. The target Cs137 ions trapped with a new target-forming technique that makes high-density stationary small number by confining them in an storage ring. After developments generation and transportation systems beam stacking method to increase ion intensity up approximately 2×107 per pulse beam, average luminosity 0.9×1026 cm−2 s−1 was achieved for Cs137. obtained...
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...
Narrow-bandwidth photon beams in the x-ray and γ-ray energy ranges are expected to be applied various fields. An recovery linac (ERL)-based laser Compton scattering (LCS) source employing a enhancement cavity can produce high-flux narrow-bandwidth beam. We conducted first experiment of an ERL-based LCS combination with cavity. obtained photons 6.95±0.01 keV by colliding electron beam 20 MeV 1064 nm wavelength. The flux at interaction point was evaluated (2.6±0.1)×107 photons/s average...
Abstract The development of a high-power EUV light source is very important in lithography to overcome the stochastic effects for higher throughput and numerical aperture (NA) future. We have designed studied free-electron laser (FEL) based on energy-recovery linac (ERL) future lithography. show that EUV-FEL has many advantages, such as extremely high power without tin debris, upgradability Beyond (BEUV) FEL, polarization controllability high-NA lithography, low electricity consumption,...
The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV first time. No clear resonance-like behavior is observed in excitation function Wγd=2.38–2.61 GeV, where d⁎(2380) dibaryon resonance COSY expected to appear. consistent with existing theoretical calculation this reaction. upper limit of section found be 0.034μb Wγd=2.37 (90% confidence level) γd→π0π0d
Controllable enhancement of excitonic spontaneous emission is demonstrated with the tuning wavelength by electric fields applied to GaAs single quantum wells located inside half-wavelength microcavities at low temperature, ∼50 K. Radiation patterns from microcavities, containing are found be well controlled fields.
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 realized an ultimately advanced imaging system that comprises a hemi-spherically curved, back-illuminated CMOS image sensor (BIS) and integrated lens which doubles the sensitivity at edge of circle increases center by factor 1.4 with one-fifth lower dark current (J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> ) than planar BIS. Because field curvature aberration (A xmlns:xlink="http://www.w3.org/1999/xlink">fc</sub> was overcome in...
Coherent double neutral-pion photoproduction on the deuteron, $\gamma{d}${$\to$}$\pi^0\pi^0{d}$, has been experimentally studied at incident photon energies ranging from 0.75 to 1.15 GeV. The total cross section as a function of $\gamma{d}$ center-of-mass energy shows resonance-like behavior, which peaks approximately 2.47 and 2.63 measured angular distribution deuteron emission is rather flat, cannot be reproduced by kinematics quasi-free $\pi^0\pi^0$ production with coalescence. In $\pi^0d...
The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. scintillator enclosed inside a balloon made thin, transparent, low-radioactivity film that we call Inner Balloon (IB). IB, apart from guaranteeing containment, also allows to minimize background cosmogenic muon-spallation products and $^{8}$B solar neutrinos. Indeed these events could contribute total counts in region interest around Q-value...
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...
We have developed a high-resolution cavity-beam position monitor (BPM) to be used at the focal point of ATF2, which is test beam line that now being built demonstrate stable orbit control $\ensuremath{\sim}\mathrm{\text{nanometer}}$ resolution. The design cavity structure was optimized for Accelerator Test Facility (ATF) in various ways. For example, has rectangular shape order isolate two dipole modes orthogonal directions, and relatively thin gap less sensitive trajectory inclination. A...
The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
We demonstrated the generation of a 500-keV electron beam from high dc voltage photoemission gun for an energy recovery linac light source [N. Nishimori et al., Appl. Phys. Lett. 102, 234103 (2013)]. This demonstration was achieved by addressing two discharge problems that lead to vacuum breakdown in gun. One is field emission generated central stem electrode. employed segmented insulator protect ceramic surface emission. The other microdischarge at anode electrode or chamber, which...
It is well known that a negative electron affinity GaAs photocathode shows moderate temporal response when excited by laser pulse of wavelength close to its band gap energy. We show here the can be estimated using diffusion model describes internal transport conduction electrons. Using transverse deflection cavity system, we measured profile bunch generated DC gun illuminated ps pulsed laser. A systematic set measurements cathodes with various active layer thicknesses and boundary conditions...
We present the response time measurements of a Cs2Te photocathode illuminated with two 100 fs duration, variable separation laser pulses at 266 nm wavelength. The was confirmed in dispersive region downstream 12-cell standing wave S-band acceleration structure using well-known RF zero-crossing technique. At same it also measured by changing mechanical path-length difference between micro-bunches. Both methods agree that is order 250 and thereby possible to generate control THz sequence...