A5059538792- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Superconducting Materials and Applications
- Advanced X-ray Imaging Techniques
- Photocathodes and Microchannel Plates
- Particle Detector Development and Performance
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Advanced Optical Sensing Technologies
- Laser Material Processing Techniques
- Photonic and Optical Devices
- Radiation Detection and Scintillator Technologies
- Advanced Fiber Laser Technologies
- Plasma Diagnostics and Applications
- Crystallography and Radiation Phenomena
- Non-Destructive Testing Techniques
- Nuclear reactor physics and engineering
- X-ray Spectroscopy and Fluorescence Analysis
- Ocular and Laser Science Research
Japan Synchrotron Radiation Research Institute
2003-2025
National Institutes for Quantum Science and Technology
2025
National Institute of Advanced Industrial Science and Technology
2024
Chiba Institute of Technology
2024
Stanford University
2021
SPring-8
2003-2012
Advanced Science Research Center
1999-2003
Kyoto University Institute for Chemical Research
1995-2002
Japan Atomic Energy Agency
1998-2002
Kyoto University
1995-2002
NanoTerasu, a new 3 GeV synchrotron light source in Japan, began user operation April 2024. It provides high-brilliance soft to tender x-rays and covers wide spectral range from ultraviolet x-rays. Its compact storage ring with circumference of 349 m is based on four-bend achromat lattice provide two straight sections each cell for insertion devices natural horizontal emittance 1.14 nm rad, which small enough users. The NanoTerasu accelerator incorporates several innovative technologies,...
A new method of optical guidance by the implosion phase a fast Z-pinch discharge in gas-filled capillary is proposed. An imploding plasma column has concave electron-density profile radial direction, just before stagnation driven converging current sheet and shock wave. The feasibility high-intensity (>1 x 10(17) W/cm(2)) Ti:sapphire laser pulse use this over distance 2 cm, corresponding to 12.5 times Rayleigh length, been experimentally demonstrated. guiding-channel formation process was...
An explanation is given for the fixed blueshift observed of an intense short pulse laser propagating in a gas chamber filled with helium. The shift found to be independent power and pressure above some critical power. results are explained by formation filaments, which occur due nonlinear polarization effects. qualitative agreement one dimensional particle-in-cell simulation including ionization gas.
NanoTerasu, a new 3 GeV synchrotron light source in Japan, began user operation April 2024. It provides high-brilliance soft to tender X-rays and covers wide spectral range from ultraviolet X-rays. Its compact storage ring with circumference of 349 m is based on four-bend achromat lattice provide two straight sections each cell for insertion devices natural horizontal emittance 1.14 nm rad, which small enough users. The NanoTerasu accelerator incorporates several innovative technologies,...
SPring-8-II is a major upgrade project of SPring-8 that was inaugurated in October 1997 as third-generation synchrotron radiation light source. This aims to achieve three goals simultaneously: achievement excellent source performance, refurbishment aged systems, and significant reduction power consumption for the entire facility. A small emittance 50 pm rad will be achieved by (1) replacing existing double-bend lattice structure with five-bend achromat one, (2) lowering stored beam energy...
Laser sources that feature a controlled pulse shape and long-term stability are required in wide range of scientific fields. We developed maintenance-free 3D-shaped UV-laser system for the photoinjector (RF gun photocathode) an X-ray SASE free electron laser (FEL). The pulse-energy was improved to 0.2%–0.3% (rms, 10 pps, 0.4 TW femtosecond operation) at fundamental wavelength 0.7%–1.4% third-harmonic wavelength. This continuously maintained five months, 24 hours day. Such improvement...
Laser wakefield acceleration (LWA) experiments have been carried out in an underdense plasma driven by a 2 TW, 90 fs laser pulse synchronized with 17 MeV RF linac electron injector at 10 Hz. Around optimum densities for LWA, we observed electrons accelerated to 35 MeV. Wakefield excitation has confirmed measuring the density oscillation frequency domain interferometer. At higher than density, also high energy over 100 up 200
The feasibility of the laser photocathode RF gun, BNL/GUN-IV, as an injector for a plasma accelerator was investigated at subpicosecond S-band twin linac system Nuclear Engineering Research Laboratory, University Tokyo. Electron beam energy 16 MeV, emittance 6/spl pi/ mm mrad, bunch length 240 fs (FWHM), and charge per 350 pC were confirmed 10 Hz. As diagnosis femtosecond electron bunch, quantitative comparison performance streak camera, coherent transition radiation (CTR) Michelson...
The full-energy beam injection system from SACLA to the SPring-8 storage ring has been developed. Low-emittance is required for future upgrade of due its small aperture. electron an X-ray free-electron laser linear accelerator not only satisfies emittance requirement but also it confers a cost benefit compared conventional dedicated injector system. In SPring-8, now delivering photon beams and serving as full-time in parallel.
A small electron storage ring (KSR) in a race track shape with the triple bend doubly achromatic lattice and circumference of 25.7 m is now under construction. Its maximum energy radius curvature bending section 300 MeV 0.835 m, respectively. The critical wavelength radiation from dipoles 17 nm. In order to enable future installation insertion device for much shorter wavelength, two long straight sections, 5.62 length are provided. magnet system consisting dipole, quadrupole sextupole...
The requirements for a BPM system the SPring-8 upgrade are long-term stability, sufficient signal intensity and high accuracy*. design of button-type electrode has been optimized from perspectives 1) mechanical structure, 2) rf characteristics, 3) thermal issue. We have adopted structure without sleeve enclosing button to maximize diameter narrow aperture vacuum chamber. absence an annular slot around in lodging hole eliminates associated beam impedance. To minimize impedance trapped mode...
The construction of a positive ion injector for the linac ALPI, named PIAVE, at Laboratori Nazionali di Legnaro was funded in 1996. beam parameters injector, consisting two superconducting radiofrequency quadrupoles (SRFQ) and eight quarter wave resonators (QWR) an equivalent voltage about 8 MV (U/sup 28+/ beam), are fixed. building is ready, infrastructures transport lines being ordered. RFQs prototyping phase. general status project reported this paper, including cryostat cryogenics,...
An electron linear accelerator has been constructed at Kyoto University, which is an injector for the 300 MeV storage ring. The output beam energy from 100 and designed current mA pulse width of 1 /spl mu/sec. component test underway. extracted gun peak RF power 20 MW successfully fed to accelerating structures 2
The SPring-8 linac has been improved to realize stable top-up injection into the and NewSUBARU storage rings. beam energy instability of 0.02% rms in long term was achieved by following stabilizations: RF amplitude phase stabilization, synchronization timing linac's 2856 MHz RF, installation an compensation system (ECS). Beam feedback controls compensate for residual long-term variation trajectory energy. A deflector installed between a gun prebuncher reduces gun's dark currents, which spoil...
A laser photocathode RF electron gun was installed in the second linac of S-hand twin system Nuclear Engineering Research Laboratory (NERL) University Tokyo August 1997. Since then, behavior new has been tested and characteristic parameters have evaluated. At exit gun, energy is 3.5 MeV, charge per bunch 1∼2 nC, pulse width 10 ps(FWHM), respectively, for 6 MW power supply from a klystron. The accelerated up to 17 MeV horizontal vertical normalized emittances 3 π mm.mrad are achieved. Then,...