A5102751065- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Plasma Diagnostics and Applications
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Gyrotron and Vacuum Electronics Research
- Advanced Data Storage Technologies
- Graphene research and applications
- Atomic and Molecular Physics
- Hydrogels: synthesis, properties, applications
- Supramolecular Self-Assembly in Materials
- Medical Imaging Techniques and Applications
Nagoya University
2018-2023
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...
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...
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 1,000 transverse emittance beam (reaccelerated...
The Level-1 trigger system (TRG) in the Belle II experiment is designed to summarize real-time sub-detectors information by using FPGA chips for central data acquisition (DAQ) system, and it includes several sub-trigger systems triggering various types of physics events interest. main focus this report CDCTRG: track with Central Drift Chamber (CDC) detector, which responsible trajectory reconstruction charged particles algorithms: Track-Segment Finder, 2D, 3D, Neuro-3D, short tracking....
We report a measurement of the $e^+e^-\to \pi^+\pi^-\pi^0$ cross section in energy range from 0.62$~$GeV to$~$3.5 GeV using an initial-state radiation technique. use $e^+e^-$ data sample corresponding to 191$~$fb$^{-1}$ integrated luminosity, collected at centre-of-mass or near $\Upsilon(4S)$ resonance with Belle II detector SuperKEKB collider. The uncertainty $\omega$ and $\phi$ resonances is 2.2%. leading order hadronic vacuum polarisation contribution muon anomalous magnetic moment this...
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...