A5044496341- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Electrostatic Discharge in Electronics
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Fusion materials and technologies
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Transcranial Magnetic Stimulation Studies
- Nuclear reactor physics and engineering
- Advanced Surface Polishing Techniques
- Graphite, nuclear technology, radiation studies
- Silicon Carbide Semiconductor Technologies
- Laser-Plasma Interactions and Diagnostics
- Advanced DC-DC Converters
- Laser and Thermal Forming Techniques
- Microgrid Control and Optimization
- Metal and Thin Film Mechanics
- Metabolism and Genetic Disorders
- Electric and Hybrid Vehicle Technologies
- Magnetic properties of thin films
- Motor Control and Adaptation
Japan Proton Accelerator Research Complex
2007-2024
Japan Atomic Energy Agency
2009-2023
Honda (United States)
2023
Tokyo University of Science
2012
Hitachi (Japan)
2009
High Energy Accelerator Research Organization
2008-2009
Mitsubishi Electric (Germany)
2008
Advanced Science Research Center
2006-2008
Mitsubishi Group (Japan)
2007
Osaka University
2006
The 3-GeV rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) was commissioned in October 2007, and successfully accomplished 3 GeV acceleration on 31. Six run cycles through February 2008 were dedicated to commissioning RCS, for which initial machine parameter tuning various underlying beam studies completed. Then since May RCS has been delivered downstream facilities their commissioning. In this paper we describe study results following our scenario a...
In the Japan Proton Accelerator Research Complex, purpose of 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at repetition rate 25 Hz high intensities, RCS was elaborately designed. After starting operation, we carefully verified validity its design and made certain improvements establish reliable higher power as possible. Consequently, demonstrated power, namely, MW. We then summarized design, actual performance, MW
Installation of the kicker magnets in extraction section rapid cycling synchrotron J-PARC facility has been completed. They succeeded extracting proton beam accelerated up to 3 GeV first commissioning with beam. The operation parameters system agreed well parameters, which were estimated from magnetic field measurement and current test each power supply. distribution integrated is flat enough meet requirements. based flattop was performed position monitors. Although a ringing structure...
New technical issues are initiated in the ITER toroidal field (TF) coil manufacturing because of scale-up by about 3 times from TF model coil. The major feasibilities high accuracy, automatic winding, precise prediction conductor elongation after heat treatment to insert narrow groove a radial plate, and development insulation system, which can sustain irradiation neutron fluence 1022 n/m and, addition, be impregnated suitable duration. One parts winding machine, bending roller head, was...
The injection bump system of the 3-GeV RCS (Rapid Cycling Synchrotron) in J-PARC (Japan Proton Accelerator Research Complex) consists pulse bending magnets for orbit, which are four horizontal (shift bump), painting (h-paint bump) and two vertical (v-paint bump). shift magnets, connected series order to form a closed orbit. needs power supplies with high speed flexible current pattern. Furthermore, tracking error is required less than 1.0% 1.0 mus current. IGBT (Insulated Gate Bipolar...
The 3 GeV Rapid Cycling Synchrotron (RCS) at Japan Proton Accelerator Research Complex is nearly the operational stage with regard to beam commissioning aspects. Recently, design painting injection study has been commenced aim of high output power extraction. In order observe phase space footprint injection, a method was developed utilizing position monitor (BPM) in so-called single pass mode. turn-by-turn coordinates circulating directly measured using pair BPMs entirely positioned drift...
A new power supply for the injection shift bump magnet at Japan Proton Accelerator Research Complex 3-GeV Rapid Cycling Synchrotron has been designed with energy upgrading of linear accelerator to 400 MeV. The is required output maximum current 32 kA, which 1.6 times present current. Moreover, peak ripple noise should be less than ±0.2% setting in a range from 10 kA insulated gate bipolar transistor chopping system produces continuous due switching, resonates load and excites forced beam...
A magnetic switching system replacing thyratron of the kicker magnet power supply in J-PARC 3 GeV rapid cycling synchrotron (RCS) was studied for stable operation. The core switch is required to have a square B-H loop as an ideal switch. Nano-crystalline alloy (Finemet; FT-1H) selected core. curves at high magnetization rate (dB/dt) were measured. Magnetization dependence field and permeability evaluated based on domain models. We speculate that progress dominated by bar-domain mode range we...
The four shift bump magnets (BUHS01-04) of the 3-GeV RCS in J-PARC, which are located at long straight section, produce a fixed main orbit to merge injection beam into circulating beam. They realized with connected series form accurate closed orbit. However, total integrated magnetic field is not zero because interference between magnet and adjacent quadrupole (Q magnet). In order measure distribution accurately, short search coil were used. Furthermore, imbalance has been improvement by...
Kicker magnets are installed in the extraction section of RCS (Rapid Cycling Synchrotron) J-PARC (Japan Proton Accelerator Research Complex) facility. They extract a 3 GeV proton beam and inject it into downstream transport line at repetition rate 25 Hz. The power supply is mainly composed charging unit, pulse forming network, thyratrons as switching device. maximum voltage 80 kV. kicker magnet distributed (transmission line) twin-C type. circuit parameters designed to have 10 Omega...
The injection system of the 3-GeV RCS (Rapid Cycling Synchrotron) in J-PARC (Japan Proton Accelerator Research Complex) consists four main orbit bump magnets (shift bump) to merge beam with circulating beam. In order control sufficient accuracy, shift need a wide uniform magnetic field. field design and structural analysis have been performed using three-dimensional electromagnetic mechanical codes. realized less than 0.35% inhomogeneity over wider area, which is 400 mm width 240 height....
Extraction kicker magnets in the RCS of J-PARC project are now under construction. They pulse with high charging voltage 60 kV, which installed vacuum chambers. mainly consist aluminum alloy for electrode plates and ferrites magnetic cores. Some structures magnet were improved to suppress discharge, we thoroughly reduced rate outgassing from components. The surface was finished by pit-free electropolishing. Aluminum cores baked before construction magnet. each until water, is main component,...
3 GeV RCS (rapid cycling synchrotron) at J-PARC (Japan Proton Accelerator Research Complex) comprises with several magnets of different kinds. These include seven septum for the beam injection and extraction ring. Design requirements these often conflicts efforts to minimize leakage magnetic field. Silicon steel sheets set outside shield fields so as keep proper orbits in ring most cases. At junction areas extraction, sufficient spacing is not available installing thick shields. Vacuum...
Several researches on fuel cell hybrid electric vehicle (FCHEV) have been conducted in order to reduce greenhouse effect gas. One of the powertrain consists cell, rechargeable energy storage device, boost chopper and bidirectional chopper. The smaller size power converter is expected. Thus, interleaved configuration has advantage size. This paper shows driving characteristics an connected a double layer capacitor (EDLC). It required that controlled by control method which considers state...
The 3-GeV rapid cycling synchrotron (RCS) of Japan Proton Accelerator Research Complex (J-PARC) simultaneously delivers high intensity beam to the Material and Life Science Experimental Facility (MLF) as well main ring (MR) at a repetition rate 25 Hz. RCS is designed for power 1 MW. has meet not only need upgrade but also specific requirement each downstream facility. One issues, especially operation, maintain two different transverse sizes extracted MLF MR; namely, wider in order reduce...
Kicker magnets in the J-PARC (Japan Proton Accelerator Research Complex) RCS (Rapid Cycling Synchrotron) are being constructed at JAERI Atomic Energy Institute) as extraction pulse magnet. They kick accelerated 3 GeV proton beam to following line a repetition rate of 25 Hz. The kicker magnet is distributed-parameter type order obtain fast rise time magnetic field. It also designed with large aperture accept maximum power 1 MW. Therefore, impedance mismatch and fringe fields have distorting...
The large-bore magnets in the injection system of a high-intensity proton synchrotron are placed close to each other as compared their bore sizes. In such cases, magnetic cores interfere with fringe fields adjacent magnets. Moreover, incoming beam passes through several kinds time-varying along line and nonlinear field region ring quadrupole magnet. behavior under these conditions is analyzed by using Runge-Kutta method. Although interference does not result emittance growth, it produces...
The simulation model for a new power supply of the injection bump system magnets [1]-[4] 3-GeV RCS (Rapid Cycling Synchrotron) in J-PARC (Japan Proton Accelerator Complex) [5], [6] has been constructed. requires reduction ripple noise current which will resonate with load and excites forced beam oscillation at 96 kHz stage. In order to incorporate impedance model, impedances feeder line magnet ceramic vacuum chamber [7] inside were measured. RF shield is formed on surface along direction....
The 3-GeV rapid-cycling synchrotron at the Japan Proton Accelerator Research Complex has achieved high-power beam operation equivalent to 1 MW. As a next step, study of an upgrade is in progress mitigate dose exposure maintenance workers high residual environment and realize further intensity power. Regarding plan's provisions for radiation protection, new injection scheme been proposed make space available shielding. total length two shift bump magnets four reduced this purpose, while other...
Each pulsed power supply of the bending magnets 3-GeV Rapid Cycling Synchrotron injection area at Japan Proton Accelerator Research Complex has been designed and manufactured for painting in transverse plane. The magnet currents both shift bump steering have a shape trapezoidal waveform, flat-top part which is used beam injection. horizontal vertical change orbit by using decaying waveform current dynamically. system with pulse forming network switching capacitor produces lower ripples due...
The present four-terminal kicker at the rapid cycling synchrotron (RCS) Japan Proton Accelerator Research Complex has power-saving benefit that it allows beam extraction by doubling excitation currents with two shorted ends. In this configuration, terminals of are connected to pulse-forming line while other terminated in a short circuit. On hand, instabilities excited RCS impedances, which result from short-circuit termination kicker. paper, we describe scheme reduce impedance using diodes...