Study of acceleration, confinement and sawtooth induced redistribution of fast resonant protons during ICRH in TFTR
Study of acceleration, confinement and sawtooth induced redistribution of fast resonant protons during ICRH in TFTR
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TFTR ICRH 期间快共振质子的加速、约束和锯齿诱导再分布研究
DOI：
10.1088/0029-5515/39/9/305
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发表时间：
1999
期刊：
影响因子：
3.3
通讯作者：
A. Roquemore
中科院分区：
文献类型：
--
作者：
A. Krasilnikov;S. Medley;N. Gorelenkov;R. Budny;D. Darrow;A. Roquemore
俄罗斯联邦开发的天然金刚石探测器首次用于TFTR氘等离子体中H+少数离子体回旋共振加热实验期间的快速电荷交换H0原子光谱法和通量演变测量。本文研究了在静止等离子体中以及在中心和离轴离子回旋共振加热（ICRH）过程中，受高频振荡影响的H+离子的行为。NDD测量的H+离子能谱产生的ICRF波的H+少数离子加速的效率和H+离子约束在不同的ICRH功率和共振层位置的数据。的NDD测量的氢电荷交换原子通量的演变进行了比较与逃逸带电粒子探测器测量的快速质子损失，以证明快速H+离子重新分布从等离子体核心远远超出了q = 1的表面。由于随机涟漪扩散，重新分布足够远离快速离子离开等离子体的等离子体中心。与非深陷快离子相比，Alfven本征模（AE）活动对深陷快离子的空间和能量分布没有显著影响。
A natural diamond detector (NDD), developed in the Russian Federation, has been used for the first time for fast charge exchange H0 atom spectrometry and flux evolution measurements during H+ minority ICRH experiments in deuterium plasmas in TFTR. The behaviour of deeply trapped RF driven H+ ions was studied in quiescent plasmas and under the influence of sawtooth oscillations during central and off-axis ICRH. H+ ion energy spectra measured by the NDD yielded data on the efficiency of H+ minority ion acceleration by ICRF waves and the H+ ion confinement at different ICRH powers and resonance layer positions. The evolution of the hydrogen charge exchange atom flux measured by the NDD was compared with fast proton losses measured by escaping charged particle detectors to demonstrate that fast H+ ions are redistributed from the plasma core to well beyond the q = 1 surface. The redistribution is sufficiently far from the plasma centre for fast ions to leave the plasma due to stochastic ripple diffusion. In contrast with non-deeply-trapped fast ions, Alfven eigenmode (AE) activity does not significantly affect the spatial and energy distributions of deeply trapped fast ions.