Plasma and Fusion Research

Volume 14, 3405097 (2019)

Regular Articles

Engineering Design of the Chinese First Quasi-Axisymmetric Stellarator (CFQS)
Shigeyoshi KINOSHITA1), Akihiro SHIMIZU1), Shoichi OKAMURA1), Mitsutaka ISOBE1,2), Guozhen XIONG3), Haifeng LIU3), Yuhong XU3) and The CQFS Team1,2,3,4)
National Institute for Fusion Science (NIFS), Toki 509-5292, Japan
The Graduate University for Advanced Studies (SOKENDAI), Toki 509-5292, Japan
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University (SWJTU), Chengdu 610031, China
Hefei Keye Electro Physical Equipment Manufacturing Co., Ltd, Hefei 230000, China
(Received 8 January 2019 / Accepted 24 March 2019 / Published 3 June 2019)


The Chinese First Quasi-Axisymmetric Stellarator (CFQS) is being constructed as an international joint project between the National Institute for Fusion Science in Japan and Southwest Jiaotong University in China. It is being designed as a low-aspect-ratio quasi-axisymmetric stellarator with a modular coil system in a CHS-qa configuration. The physics design is almost finished, and we are now proceeding with the engineering design. Its physical properties are as follows: toroidal periodic number m = 2, aspect ratio Ap = 4, magnetic field strength Bt = 1 T, major radius R0 = 1 m, and typical rotational transform iota-bar = 0.4 in the all-radial region. We are currently evaluating the design's technical feasibility and manufacturability using a 3D CAD system, together with structural and electromagnetic analysis software. This paper reports on the CFQS's feasibility from an engineering design viewpoint. We are currently targeting 16 normal conducting modular coils, divided into four types, and a total current of 5MAT. Each coil has a rectangular cross section of 132×69 mm2, and is composed of 72 hollow copper conductors with water-cooling holes. These conductors carry currents of 4.3 kA, with a current density of 74 A/mm2.


CFQS, quasi-axisymmetric configuration, engineering, normal conducting coil, stellarator

DOI: 10.1585/pfr.14.3405097


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