| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2021-07-13 |
| タイトル |
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タイトル |
The large helical device vertical neutron camera operating in the MHz counting rate range |
| 言語 |
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言語 |
eng |
| 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 |
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資源タイプ |
journal article |
| 著者 |
OGAWA, Kunihoro
ISOBE, Mitsutaka
Nishitani, T.
KOBUCHI, Takashi
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| 著者ID |
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内容記述タイプ |
Other |
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内容記述 |
0000-0003-4555-1837 |
| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
In the currently performed neutral beam (NB) -heated deuterium plasma experiments, neutrons are mainly produced by a beam-plasma reaction. Therefore, time-resolved measurement of the neutron emission profile can enhance the understanding of the classical and/or anomalous transport of beam ions. To measure radial neutron emission profiles as a function of time, the vertical neutron camera (VNC) capable of operation with a counting rate in the MHz range was newly installed on the Large Helical Device (LHD). This is the world’s first neutron camera for stellarator/heliotron devices. The VNC consists of a multichannel collimator, eleven fast-neutron detectors, and the digital-signal-processing-based data acquisition system (DAQ). The multichannel collimator having little cross talk was made from hematite-doped heavy concrete, which has a high shielding performance against both neutrons and gamma-rays. A stilbene crystal coupled with a photomultiplier having high-gain-stability in the high-count rate regime was utilized as a fast-neutron scintillation detector because it has a high neutron-gamma discrimination capability at high count rates. The DAQ system equipped with a field programmable logic controller was developed to obtain the waveform acquired with a 1 GHz sampling rate and the shaping parameter of each pulse simultaneously at up to 106 cps (counts per second). Neutron emission profiles were successfully obtained in the first deuterium campaign of LHD in 2017. The neutron emission profile was measured in tangentially co-injected NB-heated plasma with different magnetic axes (Rax). The neutron counts became larger in the inward-shifted configuration, which was consistent with the total neutron rate measured by the neutron flux monitor. The radial peak position of the line-integrated neutron profile which changed according to Rax showed that the VNC worked successfully as designed. The VNC demonstrated the expected performance conducive to extending energetic-particle physics studies in LHD. |
| 書誌情報 |
Review of Scientific Instruments
巻 89,
号 11,
p. 113509,
発行日 2018-11-21
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| 出版者 |
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出版者 |
AIP Publishing |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
00346748 |
| 書誌レコードID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00817730 |
| DOI |
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関連タイプ |
isIdenticalTo |
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識別子タイプ |
DOI |
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関連識別子 |
10.1063/1.5054818 |
| 権利 |
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権利情報 |
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Rev. Sci. Instrum. 89, 113509 (2018) and may be found at https://aip.scitation.org/doi/abs/10.1063/1.5054818. |
| 関連サイト |
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識別子タイプ |
URI |
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関連識別子 |
https://aip.scitation.org/doi/abs/10.1063/1.5054818 |
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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 |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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Review_Scient.Instrum.89_pp113509 (2.8 MB)
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