Theoretical study of the Alfven eigenmode stability in CFETR steady state discharges

Varela J.; Huang J.; Spong D. A.Chen J.Chan VGarcia L.Wingen A.Ghai Y.Zou Y.

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Theoretical study of the Alfven eigenmode stability in CFETR steady state discharges

机译：Theoretical study of the Alfven eigenmode stability in CFETR steady state discharges

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The aim of this study is to analyze the stability of Alfven eigenmodes (AE) in the China Fusion Engineering Test Reactor (CFETR) plasma for steady state operations. The analysis is done using the gyro-fluid code FAR3d including the effect of the acoustic modes, EP finite Larmor radius damping effects and multiple energetic particle populations. Two high poloidal beta scenarios are studied with respect to the location of the internal transport barrier (ITB) at r/a approximate to 0.45 (case A) and r/a approximate to 0.6 (case B). Both operation scenarios show a narrow TAE gap between the inner-middle plasma region and a wide EAE gap all along the plasma radius. The AE stability of CFETR plasmas improves if the ITB is located inwards, case A, showing AEs with lower growth rates with respect to the case B. The AEs growth rate is smaller in the case A because the modes are located in the inner-middle plasma region where the stabilizing effect of the magnetic shear is stronger with respect to the case B. Multiple EP populations effects (NBI driven EP + alpha articles) are negligible for the case A, although the simulations for the case B show a stabilizing effect of the NBI EP on the n = 1 BAE caused by alpha particles during the thermalization process. If the FLR damping effects are included in the simulations, the growth rate of the EAE/NAE decreases up to 70%, particularly for n > 3 toroidal families. Low n AEs (n < 6) show the largest growth rates. On the other hand, high n modes (n = 6 to 15) are triggered in the frequency range of the NAE, strongly damped by the FLR effects.

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来源
《Nuclear fusion》 |2022年第3期|共12页
作者
Varela J.; Huang J.; Spong D. A.Chen J.Chan VGarcia L.Wingen A.Ghai Y.Zou Y.;
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作者单位

Univ Carlos III Madrid;

Chinese Acad Sci;

Oak Ridge Natl LabUniv Sci & Technol ChinaSouthwestern Inst Phys;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类原子核物理学、高能物理学;
关键词
CFETR; AE; stability; steady state; gyro-fluid; FAR3d; MHD INSTABILITIES;

Theoretical study of the Alfven eigenmode stability in CFETR steady state discharges

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