Measurements of the fast ion slowing-down times in the HL-2A tokamak and comparison to classical theory
Measurements of the fast ion slowing-down times in the HL-2A tokamak and comparison to classical theory
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DOI：
10.1063/1.4768425
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发表时间：
2012-11
影响因子：
2.2
通讯作者：
Y. P. Zhang;M. Isobe;Yi Liu;G. Yuan;Jinwei Yang;X. Song;X. Song;J. Cao;G. Lei;H. L. Wei
中科院分区：
文献类型：
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作者：
Y. P. Zhang;M. Isobe;Yi Liu;G. Yuan;Jinwei Yang;X. Song;X. Song;J. Cao;G. Lei;H. L. Wei
磁约束聚变等离子体中的快离子物理是一个非常重要的问题，因为这些粒子将在未来的燃烧等离子体中发挥重要作用。事实上，它们将作为主要的热源，并将维持自燃的条件。为了测量磁流体静止等离子体中快离子的慢化时间，在环六旗2A装置（HL-2A）上，将脉冲宽度约为5 ms的氘中性束脉冲切向共注入氘等离子体[L. W. Yan，Nucl. Fusion 51，094016（2011）]。用~（235）U裂变室测量了中性束终止后束-等离子体反应产生的2.45MeV D-D聚变中子的衰变率。实验结果与经典慢化模型预测的结果进行了比较。这些结果表明，快离子被很好地限制在一个峰值的轮廓，离子被经典地减慢，而没有显著的。
Physics related to fast ions in magnetically confined fusion plasmas is a very important issue, since these particles will play an important role in future burning plasmas. Indeed, they will act as primary heating source and will sustain the self-ignited condition. To measure the fast ion slowing-down times in a magnetohydrodynamic-quiescent plasmas in different scenarios, very short pulses of a deuterium neutral beam, so-called “blip,” with duration of about 5 ms were tangentially co-injected into a deuterium plasmas at the HuanLiuqi-2A (commonly referred to as HL-2A) tokamak [L. W. Yan, Nucl. Fusion 51, 094016 (2011)]. The decay rate of 2.45 MeV D-D fusion neutrons produced by beam-plasma reactions following neutral beam termination was measured by means of a 235U fission chamber. Experimental results were compared with those predicted by a classical slowing-down model. These results show that the fast ions are well confined with a peaked profile and the ions are slowed down classically without signific...