Drift kinetic effects and local current drive induced modification of magnetic shear on sawtooth activity in EU DEMO

被引：3

作者：

Zhou, Lina ^{[1
]}

Liu, Yueqiang ^{[2
]}

Siccinio, Mattia ^{[3
,4
]}

Fable, Emiliano ^{[4
]}

Wu, Tingting ^{[5
]}

Duan, Ping ^{[1
]}

Chen, Long ^{[1
]}

机构：

[1] Dalian Maritime Univ, Coll Sci, Dalian 116026, Peoples R China

[2] Gen Atom, POB 85608, San Diego, CA 92186 USA

[3] EUROfus Programme, Management Unit, Boltzmannstr 2, D-85748 Garching, Germany

[4] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[5] Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China

来源：

NUCLEAR FUSION | 2020年 / 60卷 / 12期

基金：

中国国家自然科学基金;

关键词：

local magnetic shear; kinetic effect; sawtooth; internal kink instability; EU DEMO; INTERNAL KINK; STABILIZATION; MODES; TOKAMAK; CONFINEMENT; STABILITY; SAWTEETH;

D O I：

10.1088/1741-4326/abb122

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The sawtooth activity is investigated for an EU DEMO reference plasma, including kinetic effects from both thermal particles and fusion-born alphas. Kinetic effects are studied in conjunction with modification of the magnetic shear near theq= 1 surface (qis the safety factor) due to local current drive. Kinetic stabilization on the internal kink mode is found by both the non-perturbative MHD-kinetic hybrid code MARS-K (Liuet al2008Phys. Plasmas15112503) and the perturbative semi-analytic Porcelli model. The latter predicts full stabilization of the mode, when the local magnetic shears(1)at theq= 1 surface is less than 1 (e.g.s(1)similar to 0.6 as is the case for the target EU DEMO plasma without local current drive). By increasing the local magnetic shear with local current drive up tos(1)similar to 2.8, one of the Porcelli sawtooth crash criteria can be satisfied, by accessing the ion-kinetic regime. Direct MARS-K non-perturbative eigenvalue computations, on the other hand, predict less kinetic stabilization of the internal kink and more robust triggering of the sawtooth crash in EU DEMO. The general trend of the predicted results remains similar though, between the MARS-K model and the Porcelli model.

引用

页数：13

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