Speaker
Haifeng Liu
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.1039.pdf
Configuration Characteristics of Tokamak-like
Stellarator, Chinese First Quasi-axisymmetric Stellarator
Haifeng Liu1,4, Akihiro Shimizu2, Mitsutaka Isobe2,3, Shoichi Okamura2, Shin Nishimura2, and
Chihiro Suzuki2
Yuhong Xu1, Changjian Tang1,4, Hai Liu1, Xin Zhang1, Bing Liu1, Jie Huang1, Huarong Du1,
Xianqu Wang1, Dapeng Yin5, Yi Wan5and CFQS team1,2
1
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University,
Chengdu 610031, China
2
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
3
SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan
4
Physics Department, Sichuan University, Chengdu 610041, China
5
Hefei Keye Electro Physical Equipment Manufacturing Co., Ltd, Hefei, 230000, China
As an internationally collaborative project, the Chinese First Quasi-axisymmetric Stellarator
(CFQS) will be fabricated and operated by Southwest Jiaotong University in China and
National Institute for Fusion Science in Japan. The CFQS is a tokamak-like stellarator with
low-aspect ratio. Via scan of the magnetic configurations with various aspect ratios, major
radius and numbers of modular coils, the plasma boundary and modular-coil system for CFQS
have been designed and optimized. The candidate parameters of CFQS are as follows: the
major radius is 1.0 m, the toroidal magnetic field strength is 1.0 T, the toroidal periodic number
is 2 and the aspect ratio is 4.0. The 16 modular coil system has been optimized and designed
via minimizing the normal component of magnetic field on the target plasma boundary surface
generated from the modular coils, as well as adjusting the main Fourier components of
magnetic field strength produced by the modular-coil system to the original ones derived from
the target configuration. With these optimized modular coils, VMEC free boundary calculation
is conducted to check the beta limit of MHD equilibrium. Mercier stability, ballooning stability
and neoclassical transport are calculated to evaluate the property of CFQS configuration. The
MHD equilibrium of configuration is almost stable up to beta = 1%. The neoclassical transport
in the CFQS is less than that in the W7-X in 1/n regime.
