A5058900601- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Advanced X-ray Imaging Techniques
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft and Cryogenic Technologies
- Nuclear reactor physics and engineering
- Dark Matter and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Crystallography and molecular interactions
- Mechanical stress and fatigue analysis
- Advanced Electron Microscopy Techniques and Applications
- Photonic and Optical Devices
- Engineering Applied Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
High Energy Accelerator Research Organization
1992-2024
The Graduate University for Advanced Studies, SOKENDAI
2020-2021
The University of Tokyo
2012-2015
Brookhaven National Laboratory
2012
Laboratoire Leprince-Ringuet
2011
Centre National de la Recherche Scientifique
2011
École Polytechnique
2011
Abstract In recent years, there has been an increasing demand for high-intensity beams in the field of electron beam irradiation. This includes mass production nuclear medicine examinations using 99 Mo and high-efficiency through material modification via Although superconducting cavities can achieve high-current acceleration, a compact accelerator is desirable general-purpose irradiation beams. this paper, we designed practical 10 MeV, 50 mA irradiator new Nb 3 Sn cavity.
A neutron beamline for the study of fundamental physics has been constructed at spallation source Japan Proton Accelerator Research Complex (J-PARC). In-flight measurement lifetime and development transport optics ultracold neutrons are in progress. The present status these experiments is reported.
The mid-infrared range is an important spectrum where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) promising candidate for high-power light source with wavelength tunability investigate the nonlinear of materials. Although self-amplification spontaneous emission (SASE) scheme not usually adopted in range, it may have advantages such as layout simplicity, possibility producing single pulse, and scalability short-wavelength...
A disturbance observer (DOB)-based control approach was verified using the low-level radio-frequency systems of superconducting (SC) cavities operated in a continuous wave (CW) mode compact energy recovery linac (cERL) at KEK. This compensates for both predictable and unpredictable disturbances radio frequency (rf) system such as beam loading, Lorentz force detuning, microphonics. paper generalizes DOB method pulsed SC rf cERL The results show that pulse-to-pulse stabilities are improved...
Abstract The High Energy Accelerator Research Organization (KEK) has two light sources: Photon Factory (PF, 2.5 GeV) and Advanced Ring (PF-AR, 6.5 GeV). In 2017, the operation of a new beam transport line (BT) PF-AR was started, simultaneous top-up injection for both PF realized. These days, there have been strong demands reduction operating cost accelerators, its importance is greater in with higher ring-energy GeV. 2019, 5 GeV started PF-AR. However, BT (ARBT) designed energy GeV, then no...
Abstract Infrared (IR) SASE-FEL emission was successfully generated for macro pulses of about 1 μs with the maximum repetition rate 5 Hz at cERL. In future, high-power FEL operation will be planned to increase electron bunches drastically energy recovery. Therefore, dump line redesigned and reconstructed momentum acceptance improve magnet system avoiding serious beam loss in high power operation. Furthermore, first beam-transport study performed by transporting directly from injector through...
PF-AR was constructed as an accumulator ring for TRISTAN, and in the KEKB era it has been revitalized a 6.5 GeV synchrotron radiation source. The injection energy 3 beam accelerated to prior user run. original transport line (BT) from LINAC shared its upstream part with BT of High Energy Ring (HER). injection-mode change HER or vice versa needs about 10 minutes magnet cycling procedure part. In SuperKEKB, upgrade KEKB, lifetime is minutes. mode-switch operation is, therefore, not allowed...
We are developing a new type of electron microscope (EM), which utilizes the RF acceleration to exceed energy limit DC used in conventional EMs.This enables us make more compact high-voltage EMs, examine thicker specimens, and possibly obtain better spatial temporal resolutions.However, will increase dispersion, ∆E/E, because its sinusoidal field.Thus, we have designed specially shaped cavity second harmonic field, TM 020 , is superposed on first accelerating 010 .To demonstrate our...
Superconducting accelerating cavities used in high-energy accelerators can generate high electric fields of several 10 MV/m by supplying radio frequency waves (RF) with frequencies matched resonant the cavities. Generally, input RFs are fixed, and that fluctuated Lorentz force detuning Microphonics corrected feedbacks cavity tuners RF power. Now, we aim to develop tracking type control system where is not fixed consistently modulated match varying cavity. In KEK (Tsukuba, Japan), developing...