Key effects on the confinement improvement of the ASDEX Upgrade hybrid scenario

被引：14
|
作者：
Jian, Xiang [1 ,2 ]
Chan, Vincent S. [3 ,4 ]
Chen, Jiale [5 ]
Bock, Alexander [6 ]
Zohm, Hartmut [6 ]
Fable, Emiliano [6 ]
Reisner, Maximilian [6 ]
Guo, Wenfeng [5 ]
Zhuang, Ge [3 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China
[2] Univ Calif San Diego, Ctr Energy Res, La Jolla, CA 92093 USA
[3] Univ Sci & Technol China, Sch Phys Sci, Hefei 230026, Anhui, Peoples R China
[4] Gen Atom, POB 85608, San Diego, CA 92186 USA
[5] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
[6] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
来源：
NUCLEAR FUSION | 2019年 / 59卷 / 10期
基金：
国家重点研发计划;
关键词：
hybrid scenario; transport modeling; TGLF; AUG; RECONSTRUCTION; TRANSPORT;
D O I：
10.1088/1741-4326/ab3b44
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：
Transport analysis of a fully non-inductive high performance ASDEX Upgrade (AUG) hybrid mode discharge (Bock 2017 Nucl. Fusion 57 126041) is performed using a gyro-fluid transport code and a gyro-kinetic stability code. It is shown that the confluence of several mechanisms is essential for the improvement in core confinement. In addition to rotation shear, low magnetic shear, which is a common characteristic near the magnetic axis of a hybrid scenario, is found to be favorable for both electromagnetic and alpha stabilization. Together they facilitate the conditions for fast ions to establish a strong local internal transport barrier by providing additional dilution effect and enhancement of alpha stabilization. This study provides a complete picture and demonstrates that a quasilinear turbulent model is capable of quantitatively matching the experimental temperature profiles across the entire core of a hybrid mode discharge.
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页数：8
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