A5068274315- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Pulsed Power Technology Applications
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Ion-surface interactions and analysis
- Electromagnetic Compatibility and Measurements
- Photonic and Optical Devices
- Material Properties and Applications
- Fusion materials and technologies
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Quantum chaos and dynamical systems
- Semiconductor Quantum Structures and Devices
- Induction Heating and Inverter Technology
- Cold Atom Physics and Bose-Einstein Condensates
- X-ray Spectroscopy and Fluorescence Analysis
- Ga2O3 and related materials
- Silicon Carbide Semiconductor Technologies
- HVDC Systems and Fault Protection
High Energy Accelerator Research Organization
2002-2021
National Institutes for Quantum Science and Technology
2020
SPring-8
2010-2016
Japan Synchrotron Radiation Research Institute
2015
Kyushu University
2000
We report an experimental demonstration of the induction synchrotron, concept which has been proposed as a future accelerator for second generation neutrino factory or hadron collider. The synchrotron supports superbunch and permits more charge to be accelerated while observing constraints transverse space-charge limit. By using newly developed acceleration system instead radio-wave devices, single proton bunch injected from 500 MeV booster ring captured by barrier bucket created step...
A novel concept of a high luminosity hadron collider is proposed. This would be typical application an induction synchrotron being newly developed. Extremely long bunches, referred to as superbunches, are generated by multibunch stacking method employing barrier buckets at the injection into and accelerated with step voltage induced in gaps. Superbunches intersect each other, yielding more than 10(35) cm(-2) sec(-1). combination vertical crossing horizontal must employed order avoid any...
A single rf bunch in the KEK proton synchrotron was accelerated with an induction acceleration method from injection energy of 500 MeV to 5 GeV.
A medium-energy synchrotron capable of accelerating all-ion species is proposed. The accelerator employs a strong focusing lattice for ion-beam guiding and induction acceleration longitudinal capture, which driven by switching power supply. All ions, including cluster ions in their possible arbitrary charge state, are accelerated single accelerator. Since the supply employing solid-state elements energized trigger signal, generated from bunch monitor signal produced circulating ion bunch,...
A quasiadiabatic nonfocusing transition-energy crossing is proposed for suppressing any nonadiabatic and undesired features in a longitudinally separated function-type accelerator, which particles are confined by an radio-frequency voltage with adiabatic reduction of the amplitude accelerated step voltage. This new method has been examined, both theoretically experimentally.
A new particle acceleration method using pulsed induction cells was introduced in the super-bunch project at <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">KEK</b> . Unlike conventional RF acceleration, this separates functions of and confinement. As a result, is capable accelerating very long bunch beam or wide mass range particles. However, it necessary to give fast pulsed- excitation magnetic material induce an electric field accelerate...
A novel technique using single-slit x-ray Fresnel diffraction has been developed to resolve $\ensuremath{\mu}\mathrm{m}$-order electron beam sizes at the insertion devices (IDs) of photon lines. The new is promising for diagnostics next-generation light sources, where a tuning ultralow emittance essentially important ensure absence degradation brilliance and transverse coherence radiation lines due distortion lattice functions. validity method was experimentally studied SPring-8, achievable...
Proof-of-principle experiments on the induction synchrotron concept are scheduled using KEK 12-GeV proton synchrotron, in which rf bunches and a superbunch will be accelerated with long step voltage generated accelerating gaps. An unavoidable droop gives an additional focusing or defocusing force longitudinal direction. It largely deforms barrier bucket confining superbunch, leading to nonuniform particle distribution. The effects serious transition energy. Longitudinal emittance blowup...
The eight-chain RF system and radio frequency quadrupole (RFQ) linac were successfully integrated at the facility of Linear IFMIF Prototype Accelerator (LIPAc). We achieved an unprecedented high current deuteron beam up to 55 mA in pulse operation ($300~\mu \text{s}$ , 1 Hz). keys success (1) understanding reflected power from RFQ system, (2) tuning each chain individually, (3) intensive conditioning for holding stable RFQ, (4) optimizing loading compensation control. Interestingly,...
The Hybrid Ring with a superconducting-linac injector as highly flexible synchrotron radiation source to enable new experimental techniques and enhance many existing ones is proposed. It designed be operated the coexistence of storage (SR) bunches characterized by performance ring, single-pass (SP) superconducting linac. Unique experiments can performed simultaneous use SR SP beams, in addition research various utilizing versatile beam field ultrafast dynamics ultrashort pulse beam....
A proof of principle experiment an Induction Synchrotron is scheduled in 2003 at the KEK 12GeV-PS. Proton bunches are accelerated with a 10kV rectangular shaped induction voltage. An accelerating system consists four cavities capable individually generating 2.5kV output Each cavity driven by solid-state power modulator, which operated revolution frequency 600-800 kHz. The modulator circuit MOS-FETs as switching element. Uniformity voltage waveform crucial for stable acceleration. Ringing...
A scenario for the first POP experiment and crucial issues of accelerator operation with induction acceleration are discussed.
This paper discusses two issues relating to using 3 small gap insertion devices in series at BL43LXU of SPring-8 make a uniquely powerful source the 15-26 keV region x-ray spectrum. The discussed are (1) damage covers downstream IDs by radiation from upstream and (2) proper steering electron beam get best photon properties. After tests several configurations, including one where an ID was run without impedance-reducing cover, issue solved installing distributed absorber most ID. were mostly...
The emittance growth and halo formation for a mismatched beam of one-dimensional Gaussian distribution in uniform focusing channel were examined by means macroparticle simulation. results analyzed isolated nonlinear resonance theory. second-harmonic driven beam-core oscillation was both numerically analytically shown to assume key role forming halo. An analytic estimation the location explored, proved correspond outer edge islands. Nonlinear fields an actual particle have been significantly...
The validation of the Linear IFMIF Prototype Accelerator (LIPAc) is being conducted in Rokkasho Fusion Institute QST, Aomori, Japan. beam commissioning novel LIPAc RFQ has been progressing significantly, and acceleration world highest current deuteron 125 mA to 5 MeV (1 ms, 1 Hz pulsed beam) was achieved for 1st time July 2019. This study devoted evaluating amount loss during high phase by measuring neutron produced interaction with accelerator components so as verify design. foil activation...
Halo formation under a nonequilibrium state for two-dimensional Gaussian beam in FODO lattice, which is an array of magnets where F focusing, D defocusing, and O the drift space between magnets, was examined terms transition time-varying nonlinear resonances. Nonlinear resonant-interactions individual particles intrinsic beam-core oscillations result halo. The location halo analytically tractable using canonical equations derived from isolated resonance Hamiltonian.
A feasibility of focusing-free transition crossing (FFTC) in the RHIC is discussed. The FFTC a hybrid system combining rf for confinement and an induction accelerating acceleration makes bunch length kept sufficiently enough long to suppress e-cloud production or other undesired features, through energy.