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Journal Articles

Cavitation damage prediction for spallation target vessels by assessment of acoustic vibration

Futakawa, Masatoshi; Kogawa, Hiroyuki; Hasegawa, Shoichi; Ikeda, Yujiro; Riemer, B.*; Wendel, M.*; Haines, J.*; Bauer, G.*; Naoe, Takashi; Okita, Kohei*; et al.

Journal of Nuclear Materials, 377(1), p.182 - 188, 2008/06

 Times Cited Count:28 Percentile:86.69(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Numerical study on pressure wave propagation in a mercury loop

Kogawa, Hiroyuki; Hasegawa, Shoichi; Futakawa, Masatoshi; Riemer, B.*; Wendel, M.*; Haines, J.*

Journal of Nuclear Materials, 377(1), p.195 - 200, 2008/06

 Times Cited Count:2 Percentile:18.18(Materials Science, Multidisciplinary)

In beam test was carried out at the LANSCE-WNR to investigate pressure wave mitigation in mercury targets for the MW-class spallation neutron sources under international collaboration between SNS and JSNS. A mercury loop with micro bubble generator was used for the target. The loop target consists of the rectangular pipe which was made of stainless steel. The total length of the loop is about 2 m. Strain sensors were set on many points of loop to measure the strain on the pipe wall caused by the pressure wave. The maximum strain at 350 mm apart from the proton bombarded point appeared after 5.5 ms after the proton bombardment. The wave propagation velocity was slower than the stress wave and the pressure wave propagation velocities and became 65 m/s in the IBBTL. Numerical analysis result shows that the maximum strain at 350 mm apart from the proton bombarded point appeared at 5.5 ms after proton bombardment as well as the experimental due to interaction between liquid and solid.

Journal Articles

Pressure-induced site-selective disordering of Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$; A New insight into phase-change optical recording

Kolobov, A.*; Haines, J.*; Pradel, A.*; Ribes, M.*; Fons, P.*; Tominaga, Junji*; Katayama, Yoshinori; Hammounda, T.*; Uruga, Tomoya*

Physical Review Letters, 97(3), p.035701_1 - 035701_4, 2006/07

 Times Cited Count:89 Percentile:92.46(Physics, Multidisciplinary)

We demonstrate that Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ (GST), the material of choice in phase-change optical recording (such as DVD-RAM) can be rendered amorphous by the application of hydrostatic pressure. It is argued that this structural change is due to a very strong second-nearest neighbor Te-Te interaction that determines the long-range order in the metastable cubic phase of GST and also to the presence of vacancies. This newly discovered phenomenon suggests that pressure is an important factor for the formation of the amorphous phase which opens new insight into the mechanism of phase-change optical recording.

Journal Articles

Current status of the AGS spallation target experiment

Nakashima, Hiroshi; Takada, Hiroshi; Kasugai, Yoshimi; Meigo, Shinichiro; Maekawa, Fujio; Kai, Tetsuya; Konno, Chikara; Ikeda, Yujiro; Oyama, Yukio; Watanabe, Noboru; et al.

Proceedings of 6th Meeting of the Task Force on Shielding Aspects of Accelerators, Targets and Irradiation Facilities (SATIF-6), (OECD/NEA No.3828), p.27 - 36, 2004/00

no abstracts in English

Journal Articles

Research activities on neutronics under ASTE collaboration at AGS/BNL

Nakashima, Hiroshi; Takada, Hiroshi; Kasugai, Yoshimi; Meigo, Shinichiro; Maekawa, Fujio; Kai, Tetsuya; Konno, Chikara; Ikeda, Yujiro; Oyama, Yukio; Watanabe, Noboru; et al.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1155 - 1160, 2002/08

no abstracts in English

Oral presentation

Present status on high power spallation targets in the world

Futakawa, Masatoshi; Wanner, M.*; Haines, J.*

no journal, , 

Present status of high power spallation targets is introduced: SINQ facility at Paul Scherrer Institute, SNS facility at Oak Ridge National Laboratory, JSNS/J-PARC.

Oral presentation

Neutron diffraction study of the damage mechanisms in ITER superconducting cables

Stoica, A. D.*; Yang, L.*; Wang, X.-L.*; Stoica, M.*; An, K.*; Skorpenske, H.*; Conaster, R.*; Rey, C.*; Reiersen, W.*; Daniel, H.*; et al.

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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