Shape Reconstruction of RF-Driven Divertor Plasma on QUEST

Author

Nakamura, Kentaro ; Fujita, Hideaki ; Liu, X.L. ; Xue, E.B. ; Xia, Feng ; Mitarai, O. ; Kurihara, Keiichirou ; Kawamata, Yuji ; Sueoka, M. ; Hasegawa, Mikio ; Tokunaga, Kyoya ; Zushi, H. ; Hanada, K. ; Fujisawa, A. ; Matsuoka, Koichi ; Idei, Hiroshi ; Nag

Author_Institution

Res. Inst. of Appl. Mech., Kyushu Univ., Fukuoka, Japan

Volume

42

Issue

9

fYear

2014

fDate

Sept. 2014

Firstpage

2309

Lastpage

2312

Abstract

In the present RF-driven plasma with a lot of high-energy electrons, there may be anisotropic plasma pressure, which makes the usual equilibrium analysis difficult, but the Cauchy condition surface method can reconstruct the plasma shape precisely regardless of the anisotropy. In addition, the plasma current effect in the open magnetic surfaces outside of the closed magnetic surfaces is considered in the RF-driven divertor plasma. In the reconstruction process, singular value (SV) decomposition is used and optimal criterion function for generalized cross validation is estimated concerning truncation or reduction of the small-SV components.

Keywords

Tokamak devices; fusion reactor divertors; plasma pressure; plasma toroidal confinement; plasma transport processes; singular value decomposition; Cauchy condition surface method; QUEST; RF-driven divertor plasma; anisotropic plasma pressure; closed magnetic surfaces; equilibrium analysis; high-energy electrons; open magnetic surfaces; optimal criterion function; plasma current effect; shape reconstruction; singular value decomposition; spherical tokamak; Coils; Current density; Perpendicular magnetic anisotropy; Plasmas; Shape; Surface reconstruction; Cauchy condition surface (CCS); QUEST; RF-driven; divertor plasma; generalized cross validation (GCV); singular value decomposition (SVD);

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2014.2341616

Filename

6871382