Observation of energetic ion anisotropy using neutron diagnostics in the Large Helical Device

作者：K. Ogawa, M. Isobe, Siriyaporn Sangaroon, Longyong Liao, Guoqiang Zhong, R. Seki, H. Nuga, M. Osakabe · 发表于：Nuclear Fusion · 年份：2024 · DOI：10.1088/1741-4326/ad4909 · 被引用次数：7 · 研究领域：Magnetic confinement fusion research、Nuclear Physics and Applications、Plasma Diagnostics and Applications

Abstract Energetic ion anisotropy was observed by tangential sightline compact neutron energy spectrometers (CNESs) in tangential neutral beam heated deuterium plasmas in Large Helical Device. Significant upper and lower energy shifts in D–D neutron energy from 2.45 MeV were measured according to the beam ion injection directions and CNES sightline using a conventional liquid scintillation detector with the unfolding technique and a novel Cs 2 LiYCl 6 :Ce with a 7 Li-enrichment (CLYC7) scintillation detector without unfolding. The observed neutron energy spectrum was compared with that predicted by a numerical simulation based on orbit following models. Numerical simulation revealed that the Doppler shift in D–D neutron energy results from energetic ion anisotropy.