Premium
Characteristics of local helical coil system for dynamic ergodic divertor
Author(s) -
Kikuchi Yusuke,
Kojima Hiroki,
Taniyama Tomonori,
Toyoda Mitsuhiro,
Uesugi Yoshihiko,
Takamura Shuichi
Publication year - 2002
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.1142
Subject(s) - divertor , electromagnetic coil , tokamak , magnetic field , nuclear magnetic resonance , physics , mechanics , materials science , plasma , nuclear physics , quantum mechanics
Heat and particle flux control is one of the most important and difficult problems in steady‐state fusion devices. The Dynamic Ergodic Divertor (DED) is an advanced concept in which a rotational perturbed magnetic field is applied to make the tokamak edge magnetic structure stochastic so that it may decrease the heat and particle flux onto the local target in the conventional divertor. This rotational perturbed field is created by two sets of local helical coils (LHC) with a phase difference of 90° in the supplied ac currents. In DED experiments, it is important to study the perturbed magnetic field structure generated by these coil currents. In this paper, a new coil configuration is considered, which has an additional series of return windings so as to improve the mode quality of the rotating helical field (RHF). We obtain the mode structure of RHF using a new Fourier analysis. From this result, we confirm that the parasitic mode of RHF and the coil self‐inductance are decreased by the new coil configuration. © 2002 Scripta Technica, Electr Eng Jpn, 139(1): 16–23, 2002; DOI 10.1002/eej.1142