New High-Confinement Regime with Fast Ions in the Core of Fusion Plasmas

被引：45
|
作者：
Di Siena, A. [1 ]
Bilato, R. [2 ]
Goerler, T. [2 ]
Navarro, A. Banon [2 ]
Poli, E. [2 ]
Bobkov, V [2 ]
Jarema, D. [2 ]
Fable, E. [2 ]
Angioni, C. [2 ]
Kazakov, Ye O. [3 ]
Ochoukov, R. [2 ]
Schneider, P. [2 ]
Weiland, M. [2 ]
Jenko, F. [2 ]
机构：
[1] Univ Texas Austin, 201 E 24th St, Austin, TX 78712 USA
[2] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
[3] TEC Partner, Lab Plasma Phys, LPP ERM KMS, B-1000 Brussels, Belgium
来源：
PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 02期
关键词：
INTERNAL TRANSPORT BARRIER; MAGNETIC SHEAR; ASDEX UPGRADE; TURBULENCE; ELECTRON; SUPPRESSION; DISCHARGES; OPERATION;
D O I：
10.1103/PhysRevLett.127.025002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The key result of the present work is the theoretical prediction and observation of the formation of a new type of transport barrier in fusion plasmas, called F-ATB (fast ion-induced anomalous transport barrier). As demonstrated through state-of-the-art global electrostatic and electromagnetic simulations, the F-ATB is characterized by a full suppression of the turbulent transport-caused by strongly sheared, axisymmetric E x B flows-and an increase of the neoclassical counterpart, albeit keeping the overall fluxes at significantly reduced levels. The trigger mechanism is shown to be a mainly electrostatic resonant interaction between suprathermal particles, generated via ion-cyclotron-resonance heating, and plasma microturbulcncc. These findings are obtained by realistic simulations of the ASDEX Upgrade discharge No. 36637-properly designed to maximized the beneficial role of the wave-particle resonance interaction-which exhibits the expected properties of improved confinement produced by energetic particles.
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页数：6
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