阿尔文本征模活动期间快离子分布的异常展平。
Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity.
作者信息
Heidbrink W W, Gorelenkov N N, Luo Y, Van Zeeland M A, White R B, Austin M E, Burrell K H, Kramer G J, Makowski M A, McKee G R, Nazikian R
机构信息
University of California, Irvine, California 92697, USA.
出版信息
Phys Rev Lett. 2007 Dec 14;99(24):245002. doi: 10.1103/PhysRevLett.99.245002. Epub 2007 Dec 12.
Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the DIII-D tokamak. The first application of fast-ion D_{alpha} (FIDA) spectroscopy to Alfvén-eigenmode physics shows that the central fast-ion profile is anomalously flat in the inner half of the discharge. Neutron and equilibrium measurements corroborate the FIDA data. The current density driven by fast ions is also strongly modified. Calculations based on the measured mode amplitudes do not explain the observed fast-ion transport.
向具有负中心剪切的等离子体中注入中性束，在DIII-D托卡马克中产生了丰富的环向性诱导和反向剪切阿尔文本征模谱。快离子Dα（FIDA）光谱学在阿尔文本征模物理中的首次应用表明，在放电的内半部，中心快离子分布异常平坦。中子和平衡测量证实了FIDA数据。快离子驱动的电流密度也有很大改变。基于测量的模幅进行的计算无法解释观测到的快离子输运现象。
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