Coupled hydrogen moderator optimization with ortho/para hydrogen ratio

Kai, Tetsuya ; Harada, Masahide ; Teshigawara, Makoto ; Watanabe, Noboru; Ikeda, Yujiro

Neutronic performance of a coupled hydrogen moderator was studied as a function of para hydrogen concentration, moderator thickness, height and premoderator thickness. It was found that a thick (120140mm) moderator with 100% para hydrogen was optimal to provide the highest time- and energy- integrated neutron intensity below 15 meV together with the highetst possible pulse-peak intensity. Low-energy neutron distribution on the moderator viewed surface was found to exhibit an intensity-enhanced region at a picture frame part near premoderator. The rather peculiar distribution suggested that the moderator and the viewed surface must be designed so as to take the brighter region near premoderator in use.

Language	:	English
Journal	:	Nuclear Instruments and Methods in Physics Research A
Volume	:	523
Number	:	3
Pages	:	p.398 - 414
Publication Year/Month	:	2004/05
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Paper URL	:	https://doi.org/10.1016/j.nima.2003.11.427
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Keywords	:	J-PARC Coupled Hydrogen Moderator; Para-hydrogen Concentration; Slow-neutron Intensity; Pulse Shape; Spatial Distribution; Premoderator
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Registration No. : A20030119
JAEA Abstracts No. : 320523
Paper Submission No. : 20971

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