In situ measurement and modeling of hydrogen recycling and transport processes – the role of molecules
In situ measurement and modeling of hydrogen recycling and transport processes – the role of molecules
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氢回收和运输过程的原位测量和建模——分子的作用
DOI：
10.1016/s0022-3115(98)00660-6
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发表时间：
1999
影响因子：
3.1
通讯作者：
P. Greenland
中科院分区：
文献类型：
--
作者：
A. Pospieszczyk;P. Mertens;G. Sergienko;A. Huber;V. Philipps;D. Reiter;D. Rusbüldt;B. Schweer;E. Vietzke;P. Greenland
在 TEXTOR-94 中进行的实验试图阐明从面向等离子体的石墨表面释放的氢的性质和来源。通过对不同表面温度和等离子体条件下的原子和分子谱线发射的被动和主动光谱测量密度分布和速度分布。研究发现，直到 1100 K，氢气主要以 H2 形式释放。超过 1100 K 时，H2 通量减少（1370 K 时减少 50%）。与离子束实验相比，没有发现通量密度依赖性。氢原子的光子速率大于分子中两个原子的光子速率。在存在大部分分子的情况下，这可能导致低估巴尔默线测量的总氢流入量。与 EIRENE 代码计算和分子光谱数据的比较表明，分子处于高度振动激发状态，这导致低能原子解离产物。这些分子的起源可能不在等离子体中，而是已经在石墨表面。
In TEXTOR-94 experiments have been performed which try to elucidate the nature and origin of the hydrogen released from plasma facing graphite surfaces. Density profiles and velocity distributions have been measured by means of passive and active spectroscopy on atomic and molecular line emissions for different surface temperatures and plasma conditions. It was found that until 1100 K hydrogen is predominantly released as H2. Above 1100 K a reduction of the H2-flux (50% at 1370 K) was determined. No flux density dependence in comparison to ion beam experiments were found. The photon rates for hydrogen atoms are larger than for the two atoms in the molecules. In the presence of a large fraction of molecules this may lead to an underestimation of the total hydrogen influx from Balmer line measurements. Comparisons with EIRENE-code calculations and molecular spectroscopic data show that the molecules are highly vibrationally excited, which leads to low energetic atomic dissociation products. The origin or these kind of molecules is probably not in the plasma but already at the graphite surface.