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Dive into the research topics where Katsuhisa Yoshida is active.

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Featured researches published by Katsuhisa Yoshida.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1991

Nonlinear dynamics with sextupoles in low-emittance light source storage rings

Ryutaro Nagaoka; Katsuhisa Yoshida; M. Hara

Abstract An analysis is made of the nonlinear particle motions arising from sextupoles in low-emittance light source rings. By employing the single-resonance approximation to the Hamiltonian expanded into harmonics, boundaries of the stable motion brought about by 1st- and 3rd-order resonances are calculated analytically. These are used together with the second-order tune shifts with amplitude as guidelines of the analysis and of the optimization of sextupoles to improve the dynamic aperture. The application is made to two typical lattices of the light source rings, the Chasman-Green and the triple-bend achromat lattice, to pursue the lattice dependence of the nonlinear characteristics. Apart from the cases where the stability is determined by the lowest-order resonances, studies using particle tracking indicate that the motion is very often driven by higher-order resonances for which further considerations are required. Two approaches are discussed in this context. One is to interpret the phenomena as a combined effect of the lowest-order resonances, which is verified numerically by a fictitious tracking. Another is the perturbative method. The theory developed by Poincare and von Zeipel is used to analyze the horizontal dynamics, which is worked up to 4th order in amplitude. Examples that satisfactorily reproduce the phase-space structure are shown, although it is also found that perturbations of many of the sextupoles required for these low-emittance rings are even higher than 4th order.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2005

Slow beam-extraction method using a fast Q-magnet assisted by RF-knockout

Tetsuya Nakanishi; Takuji Furukawa; Katsuhisa Yoshida; K. Noda


Archive | 2011

Circular accelerator, and method for operating circular accelerator

Nobuyuki Haruna; 延是 春名; Katsuhisa Yoshida; 克久 吉田; Masahiro Ikeda; 昌広 池田; Kengo Sugawara; 賢悟 菅原; Hirobumi Tanaka; 博文 田中


Archive | 2009

Particle beam irradiation device

Yuehu Pu; Katsuhisa Yoshida; Yuichi Yamamoto; H. Sakamoto; Taizo Honda; Hisashi Harada; Takaaki Iwata


Archive | 2004

Charged-particle beam accelerator, particle beam radiation therapy system using it, and method of operating particle beam radiation therapy system

Masahiro Ikeda; Tetsuya Nakanishi; Katsuhisa Yoshida; 哲也 中西; 克久 吉田; 昌広 池田


Archive | 2012

Particle beam treatment system and beam position correcting method thereof

Kazushi Hanakawa; Kengo Sugahara; Shuhei Odawara; Hisashi Harada; Masahiro Ikeda; Toshihiro Otani; Taizo Honda; Katsuhisa Yoshida


Archive | 2011

Circular accelerator and its operation method

Nobuyuki Haruna; Katsuhisa Yoshida; Masahiro Ikeda; Kengo Sugahara; Hirofumi Tanaka


Archive | 2012

CHARGED PARTICLE BEAM TRANSPORT SYSTEM AND PARTICLE BEAM THERAPY SYSTEM

Kengo Sugahara; Shuhei Odawara; Katsuhisa Yoshida


Archive | 2012

Charged particle beam transport system and particle beam treatment device

Kengo Sugahara; Shuhei Odawara; Katsuhisa Yoshida


Archive | 2012

Septum magnet and particle beam therapy system

Kengo Sugahara; Katsuhisa Yoshida; Toshihiro Otani; Shinichi Masuno; Fumihiko Kashima

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