Takashi Yamanaka
A5107210725- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Antenna Design and Optimization
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Laser-induced spectroscopy and plasma
- Gyrotron and Vacuum Electronics Research
- High-Energy Particle Collisions Research
- Laser Design and Applications
- Radiation Detection and Scintillator Technologies
- Advanced MIMO Systems Optimization
- Ultrasonics and Acoustic Wave Propagation
- Optical Systems and Laser Technology
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Geophysics and Sensor Technology
- Neutrino Physics Research
- Full-Duplex Wireless Communications
- Rare-earth and actinide compounds
Kyushu University
2018-2024
Open Source Drug Discovery
2021
High Energy Accelerator Research Organization
2020
The Graduate University for Advanced Studies, SOKENDAI
2020
Ibaraki University
2020
Kyoto University
2020
Kyoto University Institute for Chemical Research
2020
The Open University of Japan
2019
The University of Tokyo
1987-2014
University of Electro-Communications
2002
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
At the J-PARC Muon Science Facility (MUSE), MuSEUM collaboration is now performing new precision measurements of ground state hyperfine structure (HFS) both muonium and muonic helium atoms. High-precision ground-state HFS are recognized as one most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe standard model determine fundamental constants positive muon magnetic moment mass. The same technique can also be employed measure HFS, obtain negative mass,...
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...
As a new method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast conventional which draws curve, fits time evolution of Rabi oscillation. By selecting optimized it is shown that precision twice as good with frequency sweep. Furthermore, data under different conditions can be treated in unified manner, allowing more efficient measurements for systems consisting limited number short-lived particles produced by accelerators such muons. We have...
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 modified Thomson parabola ion spectrometer of a wide dynamic range for studies flash ions emitted from laser produced plasmas was developed. The exact velocity distributions different species were obtained separately with sufficient resolution.
High precision measurements of the ground state hyperfine structure (HFS) muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants muon magnetic moment and mass, searches new physics. Muonium most suitable system to test QED because both theoretical experimental values can be precisely determined. Previous were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At J-PARC Muon Science...
This article reports the development of a compact Thomson parabola spectrometer for laser-accelerated ions that can measure angular distribution with high energy resolution and has variable measurable range. The angular-resolved spectra different ion species be measured in single shot, sampling angle selected from outside vacuum region. electric magnetic fields are applied to dispersion by using permanent circuit annulus sector-shaped electrodes wedge configuration. consists magnets, fixed...
A high-intensity pulsed muon beam is becoming available at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this are proposed. An experiment measure magnetic moment anomaly ($g-2$) and electric dipole (EDM) one of these it requires a tracking detector for positrons from decay. Fine segmentation required in tolerate high rate positrons. The time resolution be much better than anomalous spin precession period while buffer depth...
We developed an electron beam size monitor for extremely small sizes. It uses a laser interference fringe scattering target with the beam. Our performance is < 2 nm systematic error 37 and 10% statistical in measurement using 90 bunches 25 - 6000 size. A precise control system active feedback function incorporated to achieve performance. describe overall design, implementations, estimations of monitor.
The SliT ASIC is a readout chip for the silicon strip detector to be used at J-PARC muon $g-2$/EDM experiment. production version of SliT128D was designed and mass finished. A quality assurance test method bare chips developed provide sufficient number performed 5735 were inspected. No defect observed in 84.3%. Accepting few channels with poor time walk performance out 128 per chip, more than 90% yield can achieved, which construct whole detector.
Abstract A strategy for designing a dedicated beam injection and storage scheme the J-PARC Muon g-2/EDM experiment is described. To accomplish three-dimensional into MRI-type compact system, transverse phase spaces (X-Y coupling) pulsed kicker system are key to controlling vertical motion inside volume. Moreover, control through channel of magnet’s yoke crucial. We introduce five-dimensional phase-space correlation in addition strong X-Y coupling stored size level as small one-third that...
YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder X-ray diffraction (XRD), neutron (NPD), nuclear magnetic resonance, magnetization, resistivity, specific heat, muon spin rotation relaxation (muSR), absorption spectroscopy (XAS). Single crystals of were grown, their crystal structure was determined using XRD, NPD...
MuSEUM (Muonium Spectroscopy Experiment Using Microwave) collaboration aims to measure the muonium hyperfine structure (MuHFS,vhfs) with a few ppb (parts per billion). MuHFS spectroscopy is stringent test of bound-state QED. From this measurement, muon-proton magnetic moment ratio (μμ/μP) and muon-electron mass (mμ/me) can also be determined by applying high field. In previous measurement carried out at Los Alamos Meson Physics Facility (LAMPF), main uncertainty was caused lack statistics....
Muonium is one of the best probes for test bound-state QED, owing to absence effect from internal structure nucleons. The recent establishment intense pulsed muon beams at Japan Proton Accelerator Research Complex (J-PARC) paves way improved measurement muonium ground-state hyperfine (MuHFS). MuHFS also determines magnetic moment precisely, which an important input parameter measurements g-2, known 3-sigma discrepancy between experiment and theory. Spectroscopy Experiment Using Microwave...
The size of the characteristic transverse mode a planar microcavity without confinement has been measured by observing near-field pattern Rhodamine6G microlaser. This is first direct observation effective radius proposed one authors [Jpn. J. Appl. Phys. 30 (1991) L901] or, equivalently, correlation length DeMaritni et al. [Phys. Rev. Lett. 65 (1990) 1853].
A new silicon-strip readout chip named "SliT" has been developed for the measurement of muon anomalous magnetic moment and electric dipole (EDM) at Japan Proton Accelerator Research Complex (J-PARC). The SliT is designed in Silterra 180-nm CMOS technology with mixed-signal integrated circuits. An analog circuit incorporates a conventional charge-sensitive amplifier, shaping amplifiers, two distinct discriminators each 128 identical channels. digital part includes storage memories, an event...
Precision beam size monitor, so called Shintake based on laser interferometer is developed. The installation to the interaction point of ATF2 going. resolution estimated practical test and it expected satisfy requirement ATF2. detail monitor at process performance expectation are presented in this article.