Plasma and Fusion Research

Volume 14, 3403151 (2019)

Regular Articles


Consideration of the Influence of Coil Misalignment on the Chinese First Quasi-Axisymmetric Stellarator Magnetic Configuration
Akihiro SHIMIZU1), Haifeng LIU2), Shigeyoshi KINOSHITA1), Mitsutaka ISOBE1,3), Shoichi OKAMURA1), Kunihiro OGAWA1,3), Motoki NAKATA1,3), Shinsuke SATAKE1,3), Chihiro SUZUKI1), Guozhen XIONG2), Yuhong XU2), Hai LIU2), Xin ZHANG2), Jie HUANG2), Xianqu WANG2), Changjian TANG4), Dapeng YIN5), Yi WAN5) and CFQS Team1,2,3,5)
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.


Keywords

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

DOI: 10.1585/pfr.14.3403151


References

  • [1] M. Osakabe, Y. Takeiri, T. Morisaki et al., Fusion Sci. Technol. 72, 199 (2017).
  • [2] T. Klinger, A. Alonso, S. Bozhenkov et al., Plasma Phys. Control. Fusion 59, 014018 (2017).
  • [3] A.H. Boozer, Phys. Fluids 23, 904 (1980).
  • [4] A.H. Boozer, Phys. Fluids 24, 1999 (1981).
  • [5] H. Liu et al., Plasma Fusion Res. 13, 3405067 (2018).
  • [6] A. Shimizu et al., Plasma Fusion Res. 13, 3403123 (2018).
  • [7] M. Isobe et al., Plasma Fusion Res. 14, 3402074 (2019).
  • [8] V. Bykov, F. Schauer, K. Egorov, A. Tereshchenko et al., Fusion Eng. Des. 84, 215 (2009).
  • [9] M. Drevlak, Fusion Technol. 33, 106 (1998).
  • [10] S.P. Hirshman and J.C. Whitson, Phys. Fluids 26, 3553 (1983).
  • [11] V.V. Nemov, S.V. Kasilov et al., Phys. Plasmas 6, 4622 (1999).