A5037093760- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- Electrostatic Discharge in Electronics
- Radio Frequency Integrated Circuit Design
- Pulsed Power Technology Applications
- Advanced Chemical Physics Studies
- Microtubule and mitosis dynamics
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Optical Wireless Communication Technologies
- Mathematics, Computing, and Information Processing
- Electromagnetic Launch and Propulsion Technology
- Plasma Diagnostics and Applications
- Advanced Measurement and Metrology Techniques
- Semiconductor Lasers and Optical Devices
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Atmospheric Ozone and Climate
- Electromagnetic Simulation and Numerical Methods
- VLSI and Analog Circuit Testing
High Energy Accelerator Research Organization
1995-2018
Mitsubishi Heavy Industries (Germany)
2006
NTT (Japan)
2004
Steacie Institute for Molecular Sciences
1995
We have developed normal-conducting accelerating single-cell cavities with a complete higher-order-mode (HOM) heavily damped structure, into which we feed 508.9-MHz continuous wave. During high-gradient test of the second production version cavity, performed breakdown study based on direct in situ observation inner surfaces cavity. This paper presents our experimental findings obtained from this observation.
A 432-MHz, 3-MeV radio-frequency quadrupole (RFQ) linac was developed for the Japanese Hadron Project (JHP). This four vane-type RFQ stabilized against dipolemode mixing with newly devised 1-mode stabilizing loops (PISLs). In order to inject a low-emittance Hbeam into RFQ, designed pre-injector composed volume production Hion source (VPIS) and low-energy beam transport (LEBT) has been developed. of 16 mA 90% normalized emittance 0.411 mm·mrad produced by VPIS operated without cesium injected...
KEK B-Factory (KEKB) was terminated in 2010 after achieving the world record luminosity of 2.11 × 1034 cm−2s−1. This paper describes design features, performance, and operation results KEKB RF systems, which include a lot original technologies methods to store an electron/positron beam over 1 A stably. To cope with instabilities caused by large currents, two new types normal superconducting (SC) cavities stored energy were developed successfully operated. For colliding scheme called crab...
The construction of the initial part J-PARC linac has been started at KEK for beam tests before moving to JAERI Tokai campus, where facility is finally be constructed. RFQ and MEBT (Medium Energy Beam Transport) have already installed KEK, test performed successfully. In this paper, experimental results are presented together with simulation a 3D PIC (Particle-In-Cell) code.
Input couplers for radio-frequency accelerating cavities with heavy beam loading undergo many multipactoring zones due to the wide range of input powers. Furthermore, regular coaxial lines have more than rectangular waveguides because uniformity electromagnetic field. Grooving conductor surfaces is expected be a promising method suppressing under any conditions loading. In this paper, we present designing practical fine grooves on suppress multipactoring, based zone maps, and demonstrate...
In our previous study on a normal-conducting 508.9-MHz continuous-wave accelerating cavity, it was discovered that most breakdown events were accompanied by the explosion of stable bright spot one two end plates cavity (Breakdown Type I) or spot-type not originating from II); both these explosions can be understood as triggers. present study, light emitters spots in Breakdown I and dynamics II investigated using hyperspectral high-speed cameras, respectively, during high-power test.
The required alignment accuracy in the J-PARC linac is 0.1mm transverse direction. In DTL/SDTL section, fine was carried out by using an optical telescope along with cavity installation. displacement of DTL unit tank connection monitored a laser tracker to obtain tolerable between tanks. heights cavities and magnets were compensated form local settlement tunnel.
An Alvaretz-type DTL, to accelerate the H- ion beam from 3 50 MeV, is being constructed as injector for JAERI/KEK Joint Project. The following components of DTL have been developed: (1) a cylindrical tank, made by copper electroforming; (2) rf contactors; (3) pulse-excited quadrupole magnet with hollow coil (4) switching-regulator-type pulsed-power supply magnet. High-power tests conducted using short-model tank. Moreover breakdown experiment electrodes has carried out in order study...
J-PARC linear accelerator components are now being installed in the tunnel, whose total length is more than 400 m including beam transport line to 3GeV synchrotron. A precise alignment of essential for high quality acceleration. In this paper, planned schemes installation linac and watching long term motion building described. Markings placed on floor, which act as a reference initial at installation. For straight alignment, wire position sensor offset with respect center by target holder....
We demonstrate an eight-channel WDM modulator module by packaging a monolithic multichannel chip with 25-GHz spacing AWG, SOA and EAM-array. Successful operation under 2.5-Gb/s signals is achieved.
Quadrupole electromagnets have been developed with a hollow coil produced using an improved periodic reverse electroforming. These will be installed in each of the drift tubes DTL (324 MHz) as part JAERI/KEK Joint Project at high-intensity proton accelerator facility. Measurements magnets' properties were found to consistent computer-calculated estimated. The details design, fabrication process, and measurement results for quadrupole magnet are described.