| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2021-12-16 |
| タイトル |
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|
タイトル |
Neutron and gamma-ray transport calculations in support of the design of the radiation shielding for the TOFED neutron spectrometer at LHD |
| 言語 |
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|
言語 |
eng |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Time-of-flight technique |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Neutron spectrometer |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
TOFED |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
LHD |
| キーワード |
|
|
主題Scheme |
Other |
| 資源タイプ |
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|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 著者 |
Sangaroon, Siriyaporn
OGAWA, Kunihoro
ISOBE, Mitsutaka
KOBAYASHI, Makoto I.
Conroy, S.
Zhang, Y.
FAN, T.S.
OSAKABE, Masaki
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The neutron emission spectrometer (NES) has been commissioned at the Large Helical Device (LHD) with a new Time-Of-Flight-Enhanced-Diagnostics (TOFED). The aim of the TOFED is to measure the neutron energy spectrum to study the fast-ions behavior such as high-energy ions created by ion cyclotron resonance heating, beam ions, and D-D fusion born 1 MeV tritons in LHD. The instrument is assembled of the first detector S1 and the second detector S2. In 2019, TOFED was installed at Z = 13.5 m below midplane without the radiation shielding and was initially commissioned. Due to neutrons streaming through a considerable number of holes in the LHD torus hall, the ambient background radiation at the TOFED was higher than expected, which causes the large number of coincidental events on the detectors. The obtained time difference between S1 and S2 provides the strong suggestion of TOFED relocation and of TOFED shielding development. In 2020, TOFED was relocated to the basement at Z = 18.5 m below midplane. In this work, a dedicated radiation shielding design is investigated using the Monte Carlo N-Particle code (MCNP6). The shielding design fulfills the design criteria on the radiation moderation capability and engineering constraints. Due to the design criteria, borated polyethylene with thickness of 20 cm is being considered as a neutron shielding and lead with thickness of 5 cm is being considered as a gamma-ray shielding. The shielding is suggested to be a rectangular polyhedron shaped roof. With the designed shielding, neutron flux is reduced by approximately two orders of magnitude at S1 and by approximately more than two orders of magnitude at S2 while prompt gamma-ray fluence is reduced by approximately two orders of magnitude. Here, the detailed design of radiations shielding for the TOFED at LHD is presented. The appropriate radiation shielding from this work will be installed at TOFED. |
| 書誌情報 |
Fusion Engineering and Design
巻 166,
p. 112296,
発行日 2021-05-30
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| 出版者 |
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出版者 |
ELSEVIER |
| ISSN |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0920-3796 |
| 書誌レコードID |
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|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA10691446 |
| DOI |
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|
関連タイプ |
isVersionOf |
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|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1016/j.fusengdes.2021.112296 |
| 権利 |
|
|
権利情報 |
© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 |
| 権利 |
|
|
権利情報 |
(c) 2021 Elsevier B.V. All rights reserved. |
| 情報源 |
|
|
|
関連名称 |
S. Sangaroon, K. Ogawa, M. Isobe, M.I. Kobayashi, S. Conroy, Y. Zhang, T.S. Fan, M. Osakabe, Neutron and gamma-ray transport calculations in support of the design of the radiation shielding for the TOFED neutron spectrometer at LHD, Fusion Engineering and Design, Volume 166, 2021, 112296. |
| 関連サイト |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1016/j.fusengdes.2021.112296 |
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|
関連名称 |
Publisher version |
| 著者版フラグ |
|
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出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| NAIS |
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Fusion_Eng.Design166_pp112296 (2.7 MB)
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