A5049300273- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Gyrotron and Vacuum Electronics Research
- Nuclear Physics and Applications
- Neutrino Physics Research
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Magnetic confinement fusion research
- Electrostatic Discharge in Electronics
- Radiation Detection and Scintillator Technologies
- Semiconductor Quantum Structures and Devices
- Organic and Molecular Conductors Research
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Antenna Design and Analysis
- Magnetic Field Sensors Techniques
- Magneto-Optical Properties and Applications
- Superconductivity in MgB2 and Alloys
Ibaraki University
2018-2023
Osaka University
2018
Stony Brook University
1998
State University of New York
1998
Institute for Molecular Science
1995
Muons have been accelerated by using a radio-frequency accelerator for the first time. Negative muonium atoms (${\mathrm{Mu}}^{\ensuremath{-}}$), which are bound states of positive muons (${\ensuremath{\mu}}^{+}$) and two electrons, generated from ${\ensuremath{\mu}}^{+}$'s through electron capture process in an aluminum degrader. The ${\mathrm{Mu}}^{\ensuremath{-}}$'s initially electrostatically injected into quadrupole linac (RFQ). In RFQ, to 89 keV. identified momentum measurement time...
We conducted a high-power test of prototype cavity 324-MHz interdigital H-mode drift tube linac (IH-DTL) for the precise measurement muon anomalous magnetic moment ($g\ensuremath{-}2$) and electric dipole (EDM). This (short IH) was developed to verify fabrication methodology IH-DTL with monolithic structure. The electromagnetic field distribution measured compared finite element method simulation results, accuracy confirmed satisfy requirements. After 40 h conditioning, short IH stably...
Abstract A disk and washer (DAW) coupled cavity linac (CCL) was developed for a mediumvelocity part in muon to measure anomalous magentic moment search electric dipole moment. Muons were accelerated from v / c = β 0.3 0.7 at an operational frequency of 1.3 GHz. In this paper, the design, beam dynamics cold-model measurements are presented.
The cross section for thermal neutron capture by radioactive ${}^{44}\mathrm{Ti}$ was measured to be ${\ensuremath{\sigma}}_{\ensuremath{\gamma}}=1.1\ifmmode\pm\else\textpm\fi{}0.2$ b. This result shown in agreement with a direct calculation. Possible implications of the ${}^{44}\mathrm{Ti}(n,\ensuremath{\gamma})$ reaction nucleosynthesis are discussed.
A new DC muon beamline MuSIC was set up at the Research Centre for Nuclear Physics (RCNP), Osaka University. The provides an intense low-energy beam with distinc- tive devices of superconducting solenoid magnets. commissioning and a feasibility study $\mu$SR (Muon spin rotation, relaxation resonance) are in progress. In commissioning, ∼10$^5$ count/(sec·1$\mu$A-proton) negative muons ∼10$^6$ positive were measured TOF setup experimental port using 60 MeV/$c$ beam. non-destructive elemental...
Abstract Negative muonium atom ( μ + e – , Mu ) has unique features stimulating potential interesting for several scientific fields. Since its discovery in late 1980’s vacuum, it been discussed that the production efficiency would be improved using a low-work function material. C12A7 was well-known insulator as constituent of alumina cement, but recently confirmed to exhibit electric conductivity by electron doping. The electride relatively (2.9 eV). In this paper, negative measurement with...
Abstract The disk-loaded structures (DLS) in the muon LINAC are under development for J-PARC g–2/EDM experiment. Four DLSs with an accelerating gradient of 20 MV/m take charge acceleration from 40 MeV to 212 MeV, which corresponds 70% 94% speed light. quasi-constant type TM01-2π/3 mode gradually varying disk spacing was designed and it confirmed that cumulative phase slip due mismatch between velocity can be suppressed less than 2 degrees at frequency 2592 MHz. In addition, optimum...
We have measured the muon beam profile after acceleration using a radio frequency quadrupole linac (RFQ). Positive muons are injected to an aluminum degrader and negative muoniums (Mu−) generated. The generated Mu−'s extracted by electrostatic lens accelerated 89 keV RFQ. transported monitor (BPM) through magnet pair bending magnet. BPM consists of micro-channel plate, phosphor screen, CCD camera. in vertical direction is consistent with simulation. This measurement one milestones for...
A destructive monitor to measure the longitudinal bunch width of a low-energy and low-intensity muon beam was developed. This bunch-width (BWM) employed microchannel plates detect single with high time resolution. In addition, constant-fraction discriminators were adopted suppress time-walk effect. The resolution measured be 65 ps in rms using picosecond-pulsed laser. satisfied requirements linac J-PARC E34 experiment. We negative-muonium ions...
The muon anomalous magnetic moment (g−2) measurement at the Fermilab National Accelerator Laboratory (FNAL-E989) is consistent with a previous experiment Brookhaven (BNL-E821), and these results show deviation of 4.2 standard deviations from prediction Standard Model. This may suggest existence unknown particles, completely different approach experiments needed for further verification. J-PARC experiment's objective to measure g-2 electric dipole (EDM) high precision using new method...
A muon LINAC is under study for a precise measurement of g -2/EDM in J-PARC.We conducted an experiment with acceleration using RFQ (radio frequency quadrupole) on October and December 2017.The surface beam was injected to metal degrader generate slow Mu -.The -was composed the bound state µ + two electrons.The -'s were accelerated 89 keV electrostatic accelerator RFQ.Prior RF acceleration, we test run diagnostic line consisting quadrupole magnets bending magnet.The ultraviolet light...