Core Concepts
A new sightline geometry for the fast-ion D-alpha (FIDA) diagnostic on the Large Helical Device (LHD) has been successfully tested, demonstrating its ability to measure high-energy fast ions produced by negative-ion neutral beam injection.
Stats
The NNBI injection energy was 166 keV with a power of 1.5 MW.
The PNBI injection energy was 56 keV with a power of 3.5 MW.
The plasma had a central electron temperature of 5 keV.
The plasma had a central ion temperature of 1.4 keV.
The volume-averaged electron density was 0.8×10¹⁹ m⁻³.
The plasma current was 5 kA.
The FIDA peak for the high-energy view was observed at 662.2 nm, corresponding to an energy component of 81 keV along the sightline.
The FIDA peak for the low-energy view was observed at 661.8 nm, corresponding to an energy component of 71 keV along the sightline.