Three-dimensional neutral particle transport simulation for analyzing polarization resolved H-alpha spectra in the large helical device

Study of the effect of a closed divertor configuration on neutral particle control in the LHD plasma periphery

“…The measurements of polarization resolved H a spectra and the vertical profiles of the line integrated H a intensity are in good agreement with the calculations by the simulation [5,6]. It predicts that the closed divertor configuration can enhance the density of neutral hydrogen molecules in the inboard side by more than one order of magnitude compared to that in the present open divertor [4].…”

Design and installation of the closed helical divertor in LHD

“…This in-out asymmetry was well reproduced by the three dimensional neutral particle transport simulation using EIRENE code. This code was applied to analysis of the H␣ profiles observed in the LHD vacuum vessel and the calculated results well reproduced the experimental observations [20]. Thus we used this code for the design of CHD.…”

Observation of Filamentary Structures on the Boundary Region of the LHD Stellarator

“…Finally, it must be noticed how the area of www.cpp-journal.org maximum emission near the X point does not correspond with the external region of the ergodic layer, as would be expected (see, e.g. [7], [8]), but it is shifted radially outwards some 15 cm. This can be explained as a result of the aforementioned increase of the ergodic layer width due to finite β.…”