Study of the effective inverse photon efficiency using optical emission spectroscopy combined with cavity ring-down spectroscopy approach
Study of the effective inverse photon efficiency using optical emission spectroscopy combined with cavity ring-down spectroscopy approach
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利用发射光谱法与腔衰荡光谱法相结合的有效反光子效率研究
DOI：
10.1088/0031-8949/90/9/095602
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发表时间：
2015-08
期刊：
影响因子：
2.9
通讯作者：
Wu XW
中科院分区：
文献类型：
--
作者：
Wu Xingwei;Li Cong;Wang Yong;Wang Zhiwei;Feng Chunlei;Ding Hongbin;Wu XW
在长脉冲高性能场景下，碳基等离子体表面材料在聚变装置中不可避免地会形成碳氢化合物杂质。测定原位化学侵蚀产率的标准程序是利用逆光子效率D/XB。本文利用氩/甲烷级联电弧等离子体模拟器直接测量了CH4通量与cha→X跃迁的光子通量之间的转换因子（有效逆光子效率PE−1）。研究表明，测量的PE−1与计算的D/XB不同。我们比较了用发射光谱（OES）测量的光子通量和用空腔衰荡光谱（CRDS）诊断的CH(X)的电子冲击激发计算的光子通量。电荷交换和解离重组过程是CH(A)产生和去除的主要途径，导致低温下PE−1和D/XB不一致。同时，研究了解离重组过程产生的激发态CH(A)的比例，发现在Te < 1 eV时，随Te的增加，激发态CH(A)的比例从4%增加到13%。我们的工作表明，由于电子冲击激发不是CH(a)产生的唯一通道，因此应该重新解释CH能谱，并且转换因子应该有一个新的定义，而不是D/XB。这些结果对核聚变装置导流器化学侵蚀产率的评价具有一定的指导意义。
The hydrocarbon impurities formation is inevitable due to wall erosion in a long pulse high performance scenario with carbon-based plasma facing materials in fusion devices. The standard procedure to determine the chemical erosion yield in situ is by means of inverse photon efficiency D/XB. In this work, the conversion factor between CH4 flux and photon flux of CH A → X transition (effective inverse photon efficiency PE−1) was measured directly using a cascaded arc plasma simulator with argon/methane. This study shows that the measured PE−1 is different from the calculated D/XB. We compared the photon flux measured by optical emission spectroscopy (OES) and calculated by electron impact excitation of CH(X) which was diagnosed by cavity ring-down spectroscopy (CRDS). It seems that charge exchange and dissociative recombination processes are the main channels of CH(A) production and removal which lead to the inconsistency of PE −1 and D/XB at lower temperature. Meanwhile, the fraction of excited CH(A) produced by dissociative recombination processes was investigated, and we found it increased with Te in the range from 4% to 13% at Te < 1 eV. Our work suggests that the CH spectroscopy should be reinterpreted and the conversion factor should have a new definition instead of D/XB since the electron impact excitation is not the only channel of CH(A) production. These results have an effect on evaluating the yield of chemical erosion in divertor of fusion device.
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影响因子：
3.1
作者：
U. Fantz;S. Meir
通讯作者：
U. Fantz;S. Meir
影响因子：
2.9
作者：
S. Brezinsek;R. Pugno;U. Fantz;A. Manhard;H. W. Müller;A. Kallenbach;P. Mertens
通讯作者：
S. Brezinsek;R. Pugno;U. Fantz;A. Manhard;H. W. Müller;A. Kallenbach;P. Mertens
影响因子：
1.7
作者：
Li Cong;Zhang Jia-liang;Yao Zhi;W. Xingwei;Zhang Chenfei;Ding Hongbin
通讯作者：
Li Cong;Zhang Jia-liang;Yao Zhi;W. Xingwei;Zhang Chenfei;Ding Hongbin
影响因子：
2.2
作者：
Janev, RK;Reiter, D
通讯作者：
Reiter, D
影响因子：
3.3
作者：
J. Westerhout;D. Borodin;S. Brezinsek;N. Lopes Cardozo;J. Rapp;D. Schram;G. van Rooij
通讯作者：
J. Westerhout;D. Borodin;S. Brezinsek;N. Lopes Cardozo;J. Rapp;D. Schram;G. van Rooij