Sherwood 2015

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The ballooning theory with weak up-down asymmetric mode structure and its numerical verification*

Author: T. Xie
Requested Type: Poster Only
Submitted: 2015-01-20 00:42:23

Co-authors: Y.Z. Zhang, H. Qin

Contact Info:
University of Science and Technology of China
No. 96, JinZhai Road
Hefei, Anhui   230026

Abstract Text:
In this paper reported is the new approach to the ballooning theory which results in the mode structure with weak up-down asymmetry, using the two dimensional (2D) ballooning transform [Y. Z. Zhang and S. M. Mahajan, Phys. Lett. A 157, 133 (1991)]. It is shown that this type of structure may have even higher growth rate than those with fully horizontal ballooning one. Use is made of the fluid model of ion temperature gradient (ITG) mode to illustrate the salient features of the theory. The 2D analytical solutions of ITG mode obtained in ballooning representation is then converted into the real physical space to provide the boundary condition for the 2D mathematical local eigenmode problem, indicating good numerical-analytical agreements not only in the eigenvalue, but also in mode structure, implying reliable instruments for quasi-linear computation. The relationship of the approach to existing ones of ballooning theory is also discussed.

* Supported by the Fundamental Research Funds for the Central Universities.
Submitted to Nucl. Fusion (2015).


March 16-18, 2015
The Courant Institute, New York University