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Synergy of Heavy and Light Impurity Radiation in Breathing Oscillations in Large Helical Device
Author(s) -
Tokar M.Z.,
Yamazaki K.,
Funaba H.,
Nakamura Y.,
Noda N.,
Peterson B.J.,
Sagara A.,
Takeiri Y.
Publication year - 2002
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(200204)42:2/4<413::aid-ctpp413>3.0.co;2-8
Subject(s) - large helical device , plasma , radius , divertor , atomic physics , physics , ionization , amplitude , ion , computational physics , oscillation (cell signaling) , materials science , mechanics , tokamak , optics , nuclear physics , computer security , quantum mechanics , biology , computer science , genetics
The results of transport modeling for “breathing” oscillations found recently in the Large Helical Device (LHD) [1] are presented. In the model elaborated the time evolution of the central plasma temperature and density are determined from the energy and particle balance in the plasma core, the boundary temperature is computed from the edge heat balance and the transport of Fe ions over the minor radius is described in a 1‐D approximation with a self‐consistently computed source due to ionisation of neutrals sputtered at divertor plates. The results of computation substantiate the qualitative explanation proposed earlier [2] and allow to elaborate a physical picture of breathing oscillations consistent with experimental observations. The calculations reproduce well the experimental time evolution of different parameters, their phasing and the variation of the amplitude and period of oscillations with plasma characteristics.