Numerical study of fast ion behavior in the presence of magnetic islands and toroidal field ripple in the EAST tokamak

doi:10.1088/1674-1056/23/10/105201

Abstract A peculiar first orbit loss type was found apart from the normal ones when we use ORBIT code to simulate fast ion orbits in the EAST tokamak. Fast ion orbits were studied in the presence of toroidal field (TF) ripple and magnetohydrodynamic (MHD) perturbations. We analyzed the properties of the drifted orbits in detail and compared their differences, finding that the combined effects of ripple and magnetic islands are much greater than the effects of either one of them alone. Then we investigated the orbit deviations as a function of pitch angle in different radial positions. The modeling results demonstrate that the loss of trapped particles is mainly caused by the ripple, while MHD perturbation mainly plays an important role in the passing particles. Furthermore we modeled the loss rate using different equilibriums. Results prove that a higher beta can indeed improve the confinement of fast ions, while a little change in the q profile can make the topologies of magnetic islands become quite different and results in quite different total particle losses.

Keywords: fast ion toroidal field ripple magnetic island orbit drift

Received: 05 March 2014
Revised: 16 April 2014
Accepted manuscript online:

PACS:	52.20.Dq	(Particle orbits)
	52.65.-y	(Plasma simulation)
	52.25.Fi	(Transport properties)

Fund: Project supported by the JSPS-NRF-NSFC A3 Foresight Program in the Field of Plasma Physics (NSFC Grant No. 11261140328).

Corresponding Authors: Hu Li-Qun
E-mail: lqhu@ipp.ac.cn

About author: 52.20.Dq; 52.65.-y; 52.25.Fi

Cite this article:

Zhang Wei (张伟), Hu Li-Qun (胡立群), Sun You-Wen (孙有文), Ding Si-Ye (丁斯晔), Zhang Zi-Jun (张子君), Liu Song-Lin (刘松林) Numerical study of fast ion behavior in the presence of magnetic islands and toroidal field ripple in the EAST tokamak 2014 Chin. Phys. B 23 105201


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Numerical study of fast ion behavior in the presence of magnetic islands and toroidal field ripple in the EAST tokamak

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