Journal
PLASMA AND FUSION RESEARCH
Volume 14, Issue -, Pages -Publisher
JAPAN SOC PLASMA SCIENCE & NUCLEAR FUSION RESEARCH
DOI: 10.1585/pfr.14.3403123
Keywords
neutron emission anisotropy; non-Maxwellian tail; neutron emission spectrum; neutral beam injection; deuterium plasma; Large Helical Device
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Funding
- JSPS [18J12685]
- NIFS Collaboration Research program [NIFS16KERF032]
- Grants-in-Aid for Scientific Research [18J12685] Funding Source: KAKEN
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We developed an analysis model to predict and describe neutron emission anisotropy caused by anisotropy of energetic deuterons in the large helical device (LHD), by considering energetic-ion distribution functions, the differential cross-section of fusion reactions, and the exact shape of the vacuum vessel of the LHD. Neutron emission anisotropy that can be observed by the neutron activation system is evaluated numerically assuming deuterium-beam-injected deuterium plasmas confined by the LHD using the model. We demonstrate the dependence of neutron emission anisotropy on the beam-injection direction and the electron temperature. Based on this estimation, we propose an experimental scenario to validate the analysis model and easily understand energetic-ion anisotropy caused by the neutral beam injection. (C) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research
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