Thermal-hydraulic analyses of poisoned cold moderator vessel, 1; Study on Poison Plate Layout

Sato, Hiroshi; Aso, Tomokazu; Kogawa, Hiroyuki; Teshigawara, Makoto; Hino, Ryutaro

JAERI-Tech 2004-018, 23 Pages, 2004/03

JAERI-Tech-2004-018.pdf:2.42MB

The Japan Atomic Energy Research Institute is constructing a mega-watt class spallation neutron source in cooperation with the High Energy Accelerator Research Organization. A cold moderator using liquid hydrogen is one of the key components in the system, which directly affects the neutronic performance both in intensity and pulse time structure. Since a hydrogen temperature rise in the moderator vessel affects the neutronic performance, it is necessary to suppress the recirculation and stagnant regions which would cause hot spots. A cold moderator with a poison plate (poisoned decoupled moderator) has a high possibility to generate the stagnant region on and near the poison plate. Thermal-hydraulic analyses were carried out with proposed inner structure of the poisoned cold moderator. The stagnant and recirculation regions could be reduced by making a gap between the poison plate end and the vessel bottom surface, and the local temperature rise also could be kept under the required design value.

Development of cold moderator vessel for the spallation neutron source; Flow field measurements and thermal hydraulic analyses in cold moderator vessel

Aso, Tomokazu; Kaminaga, Masanori; Terada, Atsuhiko*; Hino, Ryutaro

Nihon Genshiryoku Gakkai-Shi, 43(11), p.1149 - 1158, 2001/11

https://doi.org/10.3327/jaesj.43.1149

no abstracts in English

Analytical study of narrow channel flow for a spallation target system design

Islam, M. S.*; Terada, Atsuhiko*; Kinoshita, Hidetaka; Hino, Ryutaro; Monde, Masanori*

JAERI-Tech 2001-044, 49 Pages, 2001/07

JAERI-Tech-2001-044.pdf:2.49MB

no abstracts in English

Hydraulic experiments and analyses of a cold moderator

Aso, Tomokazu; Kaminaga, Masanori; Terada, Atsuhiko*; Hino, Ryutaro

Kashika Joho Gakkai-Shi, 20(Suppl.2), p.175 - 178, 2000/10

no abstracts in English

Structural study of the cold moderator

Aso, Tomokazu; Kaminaga, Masanori; Terada, Atsuhiko*; Ishikura, Shuichi*; Hino, Ryutaro

JAERI-Tech 2000-011, p.23 - 0, 2000/02

JAERI-Tech-2000-011.pdf:1.79MB

no abstracts in English

Study on flow characteristics in cold source moderator, 1; Flow pattern measurement and hydraulic analysis

Aso, Tomokazu; Kaminaga, Masanori; Terada, Atsuhiko; Hino, Ryutaro

JAERI-Tech 99-014, 113 Pages, 1999/03

JAERI-Tech-99-014.pdf:6.26MB

no abstracts in English

Hydraulic experiments and analyses for development of the cold moderator

Aso, Tomokazu; Kaminaga, Masanori; Terada, Atsuhiko*; Hino, Ryutaro

Kashika Joho Gakkai-Shi, 19(Suppl.2), p.127 - 130, 1999/00

no abstracts in English

Proton beam control technology for high-intensity pulsed neutron production

Meigo, Shinichiro; Oi, Motoki; Fujimori, Hiroshi*; Sakamoto, Shinichi*

no journal, , 

Since the damage of the neutron target depends on the beam current density, the beam current density on the target is required to be minimized for the stable operation. Using linear optics, the current density can be reduced by expanding the beamwidth, forbidden by the increase of heat at the vicinities. Because the beam shape cannot be changed from Gaussian by linear optics, a new technique changing the beam shape was required. The beam can be shaped flatly by nonlinear optics using an octupole magnet having a cubic magnetic field. It was known that the beam loss arose by the nonlinear optics. Therefore, a detailed technique is required. Solving the transport calculation exactly, we found that the beam shape can be specified by only two parameters and the optimum parameter to achieve both the flat distribution and the minimized beam loss. From this result, we succeeded in reducing the current density on the target by about 30% compared to the previous case without significant beam loss.