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Dive into the research topics where Syuichi Ishikura is active.

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Featured researches published by Syuichi Ishikura.


Journal of Nuclear Materials | 2003

R & D on mercury target pitting issue

Kenji Kikuchi; Hiroyuki Kogawa; Masatoshi Futakawa; Syuichi Ishikura; Masanori Kaminaga; Ryutaro Hino

Abstract A technical issue in mercury spallation target development is pitting, which appears on the target vessel in conjunction with the pressure wave. Pitting has been found in off-beam line test by split Hopkinson pressure bar (SHPB) test as well as in the on-beam test of mercury target at WNR of LANSCE. In SHPB tests pressure in mercury was reduced from 80 to 40, 20 and 10 MPa. Specimens made of type 316 stainless steel were inspected before and after the impacting test at ×450 magnification. Results show that over 20 MPa pitting was generated. But at the lowest pressure in mercury, the number of pits was very limited and substantial damage was small. Substantial damage by pitting is characterized by holes where mass is removed from the wall. Depression itself may not be a substantial damage as long as it is not accompanied by holes.


Journal of Nuclear Materials | 2003

Bubble dynamics in the thermal shock problem of the liquid metal target

Syuichi Ishikura; Hiroyuki Kogawa; Masatoshi Futakawa; Kenji Kikuchi; Ryutaro Hino; Chuichi Arakawa

The thermal shock stress in a mercury target vessel was analyzed. The target receives the incident proton beam at an energy of 1 MW with a pulse duration of 1 μs. A negative pressure of 61 MPa was generated following the dispersion of the compression field at 52 MPa which was generated by the proton beam injection. It is expected that cavitation may be caused by the negative pressure. In order to evaluate the cavitation behavior and the following material damage mechanism, a simulation study was carried out using the equation of motion based on bubble dynamics for a single bubble, and fundamental parameter analysis was carried out. It is found that a bubble has a volume expansion of more than 1000 times with a change of the pressure at the window of the target vessel. Consequently wave propagation will be affected. Theoretical consideration was given to the wave motion of propagation in a bubbly liquid. The equation of state in a bubbly liquid can be approximated by polynomials. The diameter of a bubble and the bubble volume fraction inherent in mercury can be estimated if the critical pressure, the sound velocity, and resonance frequency are measured by static and dynamic experiments.


Journal of Nuclear Materials | 2005

Pitting damage by pressure waves in a mercury target

Masatoshi Futakawa; Takashi Naoe; C.C. Tsai; Hiroyuki Kogawa; Syuichi Ishikura; Yujiro Ikeda; Hitoshi Soyama; Hidefumi Date


Journal of Nuclear Materials | 2005

Effect of proton beam profile on stress in JSNS target vessel

Hiroyuki Kogawa; Syuichi Ishikura; Hiroshi Sato; Masahide Harada; Shunichi Takatama; Masatoshi Futakawa; Katsuhiro Haga; Ryutaro Hino; Shin-ichiro Meigo; Fujio Maekawa; Yujiro Ikeda


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2006

Evaluation of the 3-GeV proton beam profile at the spallation target of the JSNS

Shin-ichiro Meigo; Fumiaki Noda; Syuichi Ishikura; Masatoshi Futakawa; Shinichi Sakamoto; Yujiro Ikeda


Atomic Energy Society of Japan | 2004

Micro Pit Formation by Mercury-sphere Collision

Syuichi Ishikura; Hiroyuki Kogawa; Masatoshi Futakawa; Masanori Kaminaga; Ryutaro Hino; Masakatsu Saito


Journal De Physique Iv | 2003

Localized-impact damage caused by proton bombarding in mercury target

Masatoshi Futakawa; Hiroyuki Kogawa; Syuichi Ishikura; H. Kyudo; Hitoshi Soyama


publisher | None

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Nuclear Science | 2006

Experimentaland Analytical Results on H2SO4 and SO3 Decomposers for IS Process Pilot Plant

Atsuhiko Terada; Yoshiyuki Imai; Hiroki Noguchi; Hiroyuki Ota; Akihiro Kanagawa; Syuichi Ishikura; Shinji Kubo; Jin Iwatsuki; Kaoru Onuki; Ryutaro Hino


The Proceedings of the Materials and processing conference | 2004

Evaluation on impact damage by mercury micro-jet

Masatoshi Futakawa; Takashi Naoe; Toshiyuki Oi; Hiroyuki Kogawa; Syuichi Ishikura; Yujiro Ikeda

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Hiroyuki Kogawa

Japan Atomic Energy Agency

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Ryutaro Hino

Japan Atomic Energy Agency

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Masanori Kaminaga

Japan Atomic Energy Research Institute

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Yujiro Ikeda

Japan Atomic Energy Agency

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Atsuhiko Terada

Japan Atomic Energy Research Institute

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Kenji Kikuchi

Japan Atomic Energy Research Institute

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Takashi Naoe

Japan Atomic Energy Agency

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