The spectral profile of the line emitted from the divertor region of JT-60U
The spectral profile of the line emitted from the divertor region of JT-60U
复制标题
JT-60U 偏滤器区域发射的谱线的光谱轮廓
DOI：
10.1088/0741-3335/40/6/017
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发表时间：
1998
影响因子：
2.2
通讯作者：
N. Hosogane
中科院分区：
文献类型：
--
作者：
H. Kubo;H. Takenaga;T. Sugie;S. Higashijima;S. Suzuki;A. Sakasai;N. Hosogane
为了了解氘原子的再循环和发射过程，用高分辨谱仪观测了JT-60 U偏滤器区发射线的谱线轮廓，并用三维中性粒子输运程序进行了模拟分析。该配置文件已被解释为由窄和宽的组件;窄的组件归因于解离产生的原子的解离激发和电子碰撞激发，和宽的组件归因于反射和电荷交换产生的原子的电子碰撞激发。在低密度等离子体中，模拟的线轮廓与观察到的相当一致，尽管偏滤器瓦片反射的原子的分量被高估了约2倍。氘分子和分子离子的离解激发对谱线强度起重要作用。对于反射和电荷交换产生的高能氘原子，由于快原子容易从偏滤器等离子体中逃逸，因此线强度与氘原子通量的比值减小。在低密度情况下窄分量的宽度对应于1.3eV的氘原子的温度，并且在高密度情况下窄分量的宽度对应于2.2eV的温度。
In order to understand the recycling and emission processes of deuterium atoms, spectral profiles of the line emitted from the divertor region of JT-60U have been observed with a high-resolution spectrometer and analysed by simulation with a three-dimensional neutral particle transport code. The profile has been explained as composed of narrow and broad components; the narrow component is attributed to dissociative excitation and electron collisional excitation of the atoms produced by dissociation, and the broad component is attributed to electron collisional excitation of the atoms produced by reflection and charge exchange. In low-density plasmas, the simulated line profile agrees reasonably well with that observed, although the component attributed to the atoms reflected at the divertor tiles is overestimated by a factor of about two. Dissociative excitation from deuterium molecules and molecular ions plays an important role for the line intensity. The ratio of the line intensity to the deuterium atom flux for high-energy deuterium atoms, which are produced by the reflection and charge exchange, is reduced, because the fast atoms readily escape from the divertor plasma. The width of the narrow component in a low-density case corresponds to a temperature of deuterium atoms of 1.3 eV, and that in a high-density case corresponds to a temperature of 2.2 eV.