Abstract
Abstract
Three compact neutron emission spectrometers (CNESs) based
on the novel inorganic scintillator Cs2LiYCl6:Ce with 99%
7Li-enrichment (CLYC7) were newly installed in different lines
of sight in the Large Helical Device (LHD) to study the anisotropy
of the velocity distribution of the beam ions. Neutron energy
spectra measurements using multi-sightline CNESs were performed
under neutral-beam (NB)-heated deuterium plasma. A significant
Doppler shift of the deuterium-deuterium (D-D) neutron energy
induced by different NB heating and different lines of sight was
observed. The measured peak neutron energies were nearly consistent
with those calculated by the simple two-body kinematics of the D-D
reaction using the tangency radii of CNESs and NBs. These results
demonstrated the capabilities of the CNESs for neutron energy
spectra measurements and the study of fast-ion physics in magnetic
confinement fusion research.