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Consideration of the Influence of Coil Misalignment on the Chinese First Quasi-Axisymmetric Stellarator Magnetic Configuration

Akihiro SHIMIZU¹⁾, Haifeng LIU²⁾, Shigeyoshi KINOSHITA¹⁾, Mitsutaka ISOBE^1,3), Shoichi OKAMURA¹⁾, Kunihiro OGAWA^1,3), Motoki NAKATA^1,3), Shinsuke SATAKE^1,3), Chihiro SUZUKI¹⁾, Guozhen XIONG²⁾, Yuhong XU²⁾, Hai LIU²⁾, Xin ZHANG²⁾, Jie HUANG²⁾, Xianqu WANG²⁾, Changjian TANG⁴⁾, Dapeng YIN⁵⁾, Yi WAN⁵⁾ and CFQS Team^1,2,3,5)

1)

National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan

2)

Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China

3)

SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan

4)

School of Physical Science and Technology, Sichuan University, Chengdu 610041, China

5)

Hefei Keye Electro Physical Equipment Manufacturing Co., Ltd, Hefei 230000, China

(Received 10 January 2019 / Accepted 20 May 2019 / Published 25 September 2019)

Abstract

The effects of misalignment of modular coils on various physical properties in the Chinese first quasi-axisymmetric Stellarator (CFQS) are discussed in this study. To estimate the effects quantitatively, simple assumptions are made regarding the structure of coil displacement. We consider the following three cases: displacement in radial direction (Case A), displacement in the vertical direction (Case B), and displacement by tilting (Case C). In all cases, we assume that the displacement structure has a stellarator symmetry. These assumptions are employed to calculate the change in the magnetic surfaces, rotational transform profile, magnetic well depth profile, and the effective helical ripple. Calculation results show that if the magnitude of displacement is less than 10 mm, the effects on these physical properties are small, and the good neoclassical transport property is retained.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

quasi-axisymmetric stellarator, the Chinese first quasi-axisymmetric stellarator (CFQS), modular coil, misalignment, effective helical ripple

DOI: 10.1585/pfr.14.3403151

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