Determination of photon efficiencies and hydrocarbon influxes in the detached outer divertor plasma of ASDEX Upgrade
Determination of photon efficiencies and hydrocarbon influxes in the detached outer divertor plasma of ASDEX Upgrade
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DOI：
10.1088/0031-8949/2007/t128/008
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发表时间：
2007-03
期刊：
影响因子：
2.9
通讯作者：
S. Brezinsek;R. Pugno;U. Fantz;A. Manhard;H. W. Müller;A. Kallenbach;P. Mertens
中科院分区：
文献类型：
--
作者：
S. Brezinsek;R. Pugno;U. Fantz;A. Manhard;H. W. Müller;A. Kallenbach;P. Mertens
在ASDEX升级的分离等离子体条件下，进行了光谱信号原位标定的注烃实验，以确定烃的通量和化学侵蚀产额。提出了一种分离L模式外偏滤器的等离子体方案，并提供了冷(Te≃，1-2 eV)和体积复合的重组靶等离子体。在剥离过程中观察到与碳相关的本征光子通量显著减少，尤其是CHGerö和C2 Swan带。通过单个气阀进行了适度的甲烷/乙烯注入，并检测到与碳相关的本征光子通量的增加，这可以归因于注入的分子的数量。实验测得的有效反光子效率略大于附加等离子体的有效反光子效率。然而，在分离条件下观察到的低本征CH和C2光仍然可以归因于烃通量减少约一个数量级。讨论了剥离对化学侵蚀的影响。
Hydrocarbon injection experiments with in situ calibration of spectroscopic signals have been carried out to determine the hydrocarbon flux and the chemical erosion yield under detached plasma conditions in ASDEX Upgrade. A plasma scenario was developed to detach the outer divertor in L-mode and to provide a cold (Te≃1–2 eV) and volume recombining deuterium target plasma. A significant decrease of carbon-related intrinsic photon fluxes, in particular of the CH Gerö and of the C2 Swan band was observed in detachment. Moderate methane/ethene injections were performed through a single gas valve and an increase of carbon-related intrinsic photon fluxes was detected, which can be attributed to the amount of injected molecules. The experimentally determined effective inverse photon efficiencies are slightly larger than the ones deduced in attached plasmas. Nevertheless, the low intrinsic CH and C2 light observed under detached conditions can still be attributed to a reduction of the hydrocarbon flux of about one order of magnitude. The impact of detachment on the chemical erosion is discussed.