通过可控的高能离子密度斜坡实现DIII-D装置中阿尔文本征模的稳定以及理论与模拟的验证

Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations.

作者信息

Tang S X, Carter T A, Crocker N A, Heidbrink W W, Lestz J B, Pinsker R I, Thome K E, Van Zeeland M A, Belova E V

机构信息

University of California, Los Angeles, Los Angeles, California 90095, USA.

University of California, Irvine, Irvine, California 92697, USA.

出版信息

Phys Rev Lett. 2021 Apr 16;126(15):155001. doi: 10.1103/PhysRevLett.126.155001.

DOI:10.1103/PhysRevLett.126.155001

PMID:33929259

Abstract

Fast-ion driven Alfvén waves with frequency close to the ion cyclotron frequency (f=0.58f_{ci}) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion research plasma. The scaling of wave amplitude with injection rate is consistent with theory for single mode collisional saturation near marginal stability. The wave is identified as a shear-polarized global Alfvén eigenmode excited by Doppler-shifted cyclotron resonance with fast ions with sub-Alfvénic energetic ions, a first in fusion research plasmas.

摘要

在聚变研究等离子体中，首次通过控制高能离子密度斜坡，使由中性束中的高能离子激发的、频率接近离子回旋频率（f = 0.58f_ci）的快离子驱动阿尔文波得以稳定。波幅随注入率的标度与接近边际稳定性时单模碰撞饱和的理论一致。该波被识别为一种剪切极化的全局阿尔文本征模，由具有亚阿尔文速度的高能离子与快离子的多普勒频移回旋共振激发，这在聚变研究等离子体中尚属首次。