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Characteristics of Edge Magnetic Field Structure in LHD Heliotron
Author(s) -
Morisaki T.,
Sakakibara S.,
Watanabe K.Y.,
Yamada H.,
Masuzaki S.,
Ohyabu N.,
Komori A.,
Yamazaki K.,
Motojima O.
Publication year - 2000
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/1521-3986(200006)40:3/4<266::aid-ctpp266>3.0.co;2-m
Subject(s) - divertor , large helical device , physics , magnetic field , beta (programming language) , enhanced data rates for gsm evolution , resonant magnetic perturbations , computational physics , atomic physics , plasma , toroid , nuclear physics , tokamak , telecommunications , quantum mechanics , computer science , programming language
Results of numerical analyses of edge and divertor magnetic field structure are presented for the Large Helical Device (LHD). For the analyses, a field line tracing code has been developed to include the finite beta effect and cross‐field particle diffusion, simulating the anomalous transport. Precise analyses of the helical divertor under finite beta conditions were performed for the first time. It is found that, in the magnetic axis shift operation from 3.6 m to 3.9 m, striking points of divertor legs shift more than 250 mm on target plates. Meanwhile very small shift less than 15 mm can be seen with increased beta up to ∼2%, in spite of the large magnetic axis shift more than 300 mm. Although the shift of striking point is small under finite beta conditions, distortion in the fine structure of a divertor leg is taken place, which may affect the edge particle transport during high beta discharges.