Basic design of shield blocks for a spallation neutron source under the high-intensity proton accelerator project

Yoshida, Katsuhiko*; Maekawa, Fujio; Takada, Hiroshi

JAERI-Tech 2003-019, 52 Pages, 2003/03

JAERI-Tech-2003-019.pdf:2.89MB

Under the JAERI-KEK High-Intensity Proton Accelerator Project (J-PARC), a spallation neutron source driven by a 3 GeV-1MW proton beam is planed to be constructed as a main part of the Materials and Life Science Facility. Overall dimensions of a biological shield of the neutron source had been determined by evaluation of shielding performance by Monte Carlo calculations. This report describes results of design studies on an optimum dividing scheme in terms of cost and treatment and mechanical strength of shield blocks for the biological shield. As for mechanical strength, it was studied whether the shield blocks would be stable, fall down or move to a horizontal direction in case of an earthquake of seismic intensity of 5.5 (250 Gal) as an abnormal load. For ceiling shielding blocks being supported by both ends of the long blocks, maximum bending moment and an amount of maximum deflection of their center were evaluated.

Beamlet-beamlet interaction in a multi-aperture negative ion source

Fujiwara, Yukio; Hanada, Masaya; Okumura, Yoshikazu; Watanabe, Kazuhiro; Kawai, Kenichi*

Review of Scientific Instruments, 71(8), p.3059 - 3064, 2000/08

https://doi.org/10.1063/1.1305515

no abstracts in English

Beamlet interaction in multi-aperture negative ion source

Fujiwara, Yukio; Hanada, Masaya; Kawai, Kenichi*; *; Miyamoto, Kenji; Okumura, Yoshikazu; Watanabe, Kazuhiro

JAERI-Research 99-013, 32 Pages, 1999/02

JAERI-Research-99-013.pdf:1.51MB

no abstracts in English