A5071562389- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Advancements in Photolithography Techniques
- Plasma Diagnostics and Applications
- Crystallography and Radiation Phenomena
- Electrostatic Discharge in Electronics
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray and CT Imaging
- Hybrid Renewable Energy Systems
- Context-Aware Activity Recognition Systems
- Pulsed Power Technology Applications
- Chromatography in Natural Products
- Hydraulic and Pneumatic Systems
- Quantum and Classical Electrodynamics
- Photocathodes and Microchannel Plates
- Healthcare Regulation
- Natural product bioactivities and synthesis
- Transport Systems and Technology
High Energy Accelerator Research Organization
2017-2024
SLAC National Accelerator Laboratory
2023
Doshisha University
1991-2003
Hitachi (Japan)
1991
Hiroshima University
1979
We have developed a wearable airbag that incorporates fall-detection system uses both acceleration and angular velocity signals to trigger inflation of the airbag. The algorithm was devised using thresholding technique with an accelerometer gyro sensor. Sixteen subjects mimicked falls, their waveforms were monitored. Then, we could detect 300 ms before fall. This signal used as inflate capacity 2.4 L. Although proposed can help prevent fall-related injuries, further development is needed...
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 use of field desorption mass spectrometry is demonstrated not only for molecular weight determination but also detailed structural analysis large, underivatized natural products. Owing to cationization by small alkali salt impurities, saponins carrying one four sugar units gave abundant quasimolecular ions. In addition, the observed sequence-specific fragment ions reflected complete sequence in oligoglycosides. This fragmentation oligosaccharidic moiety products was interpreted analogy...
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.
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...
The beam halo mitigation is a very important challenge for reliable and safe operation of high-energy machine. A systematic study was conducted at the KEK compact energy recovery linac (cERL) since non-negligible loss observed in recirculation loop during common operation. We found that can be avoided by making use collimation system. Beam measurements have demonstrated presence vertical halos multiple locations line (except region near electron gun). Based on these observations, we made...
A compact accelerator design for irradiation purposes is being proposed at KEK. This targets an energy of 10 MeV and a current 50 mA. Current includes 100 kV thermionic DC electron gun with RF grid, 1-cell normal-conducting buncher cavity, Nb$_{3}$Sn superconducting cavities to accelerate the beam final MeV. The goal present dynamics study loss suppression (to ppm level), since it results in thermal load on cavity. Then performance exit should be confirmed. main issue was transport without...
The development of a high-power EUV light source is important to overcome the stochastic effects in future lithography. EUV-FEL one promising candidates. This paper proposes accelerator plan.
Research and development of a high-power EUV light source are very important in lithography to overcome the stochastic effects for higher throughput finer patterning future. We have designed studied free-electron laser (FEL) based on energy-recovery linac (ERL) future lithography. The EUV-FEL has many advantages such as extremely high power without tin debris, narrow spectral bandwidth, upgradability Beyond (BEUV) FEL, polarization controllability high-NA lithography, low consumption...
A compact energy-recovery linac (cERL) has been un-der construction at KEK since 2009 to develop key technologies for the linac. The cERL began operating in 2013 create a high-current beam with low-emittance stable continuous wave (CW) superconducting cavities. Owing development of critical components, such as DC gun, cavities, and design ideal transport optics, we have successfully established approximately 1 mA CW operation small emittance extremely loss. This study presents details our...
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...
Energy-recovery linacs (ERLs) have been emphasised by the recent (2020) update of European Strategy for Particle Physics as one most promising technologies accelerator base future high-energy physics. The current paper has written a document to support and specify details recently published roadmap development energy-recovery linacs. summarises previous achievements on ERLs status field its basic technology items. main possible contributions applications particle nuclear physics well...
A design method is proposed for a planar dielectric waveguide Y branch with low loss caused by radiation. In contrast to the usual methods, in which generation of radiation wave kept as small possible, present positively uses, first time, behavior such wave. The at any local position along taper section intentionally generated, and its power conversion reconversion surface-wave mode are controlled reduce insertion mode. example shows that low-loss should have serpentine-shaped taper, an...
Beam losses due to the Touschek effect, residual gas scattering, intra-beam scattering and field emission from main cavity were studied for KEK compact Energy Recovery Linac (cERL), which is now under commissioning. By studying beam of cERL, we can better understand loss mechanisms, estimate rates, localize potentially dangerous areas line future 3GeV ERL project. The goal achieve a safety lowemittance high-current operation help contribute study We used existing modified ELEGANT routine...
A novel methodology is proposed for designing a planar dielectric-waveguide Y-branch with theoretical zero-loss due to radiation. The taper section designed so as control the intensive power conversion and reconversion between surface-wave mode into desired model at output, while suppressing undesired reflection input end. effectiveness of concept confirmed by comparing numerical results those conventional Y-branches measurement results.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
At the KEK Compact ERL (cERL) designed to operate at high-brilliance and high-current electron beams, maximum averaged current was recorded 6.5 muA for beam energy of 20 MeV on March 2014 should be increased up 10 mA in a step-by-step manner few years. In order increase by reducing loss, we need know mechanism loss. For this purpose investigate halo originated from characteristics imperfections an gun system, using tracking code GPT (General Particle Tracer). The can lost beam-pipe apertures...