Numerical investigation of alpha particle confinement under the perturbation of neoclassical tearing modes and toroidal field ripple in CFETR

Hao, Baolong; White, Roscoe; Gao, Xiang; Li, Guoqiang; Chen, Wei; Wang, Xiaojing; Wu, Bin; Wu, Muquan; Zhu, Xiang; Lin, Xiaodong; Jie, Yinxian; Zang, Qing; Li, Jiangang; Wan, Yuanxi

doi:10.1088/1741-4326/abe4e8

Title: Numerical investigation of alpha particle confinement under the perturbation of neoclassical tearing modes and toroidal field ripple in CFETR

Journal Article · Mon Mar 22 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abe4e8· OSTI ID:1815372

^[1]; White, Roscoe ^[2];

^[3]; Li, Guoqiang ^[4];

^[5];

^[4]; Wu, Bin ^[4]; Wu, Muquan ^[1];

^[1]; Lin, Xiaodong ^[1]; Jie, Yinxian ^[1]; Zang, Qing ^[1]; Li, Jiangang ^[1]; Wan, Yuanxi ^[1]

Shenzhen Univ. (China)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Shenzhen Univ. (China); Chinese Academy of Sciences (CAS), Hefei (China). Institute of Plasma Physics
Chinese Academy of Sciences (CAS), Hefei (China). Institute of Plasma Physics
Southwestern Institute of Physics, Chengdu (China)

The confinement of alpha particles in burning plasma is a key issue in fusion reactor design, including particle interaction with instabilities. Here, we include two topics: the effect of neoclassical tearing modes (NTMs) and toroidal field ripple on alpha particle loss, and the assessment of particle redistribution under an NTM with a reduced model. We consider Chinese fusion engineering test reactor parameters, the alpha particle distribution given by TRANSP/NUBEAM and the NTM perturbation function given by the initial value code TM1. We show that the synergistic effect of the NTM and ripple is negligible; the particle loss fraction does not change with increasing NTM amplitude. Only passing particles are affected by the mode particle resonance, producing profile flattening but no increased loss because only trapped particles are influenced by ripple. To study alpha particle profile flattening, the work adopts an innovative method of phase vector rotation to determine regions of good and broken Kolmogorov–Arnold–Moser surfaces and equilibrates the particle density according to local stochasticity.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC)

Contributing Organization:: CFETR Physics Team

Grant/Contract Number:: AC02-09CH11466; 11905142; 11875290

OSTI ID:: 1815372

Journal Information:: Nuclear Fusion, Vol. 61, Issue 4; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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