Flux dependence of carbon chemical erosion by deuterium ions
Flux dependence of carbon chemical erosion by deuterium ions
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DOI：
10.1088/0029-5515/44/11/l01
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发表时间：
2004-11
期刊：
影响因子：
3.3
通讯作者：
J. Roth;R. Preuss;W. Bohmeyer;S. Brezinsek;A. Cambe;E. Casarotto;R. Doerner;E. Gauthier;G. Federici;S. Higashijima;J. Hogan;A. Kallenbach;A. Kirschner;H. Kubo;J. Layet;T. Nakano;V. Philipps;A. Pospieszczyk;R. Pugno;R. Ruggieri;B. Schweer;G. Sergienko;M. Stamp
中科院分区：
文献类型：
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作者：
J. Roth;R. Preuss;W. Bohmeyer;S. Brezinsek;A. Cambe;E. Casarotto;R. Doerner;E. Gauthier;G. Federici;S. Higashijima;J. Hogan;A. Kallenbach;A. Kirschner;H. Kubo;J. Layet;T. Nakano;V. Philipps;A. Pospieszczyk;R. Pugno;R. Ruggieri;B. Schweer;G. Sergienko;M. Stamp
在离子束实验中，详细地研究了氢等离子体作用下碳的化学侵蚀，得到了侵蚀产额与离子能量和表面温度的函数关系。然而，ITER偏滤器中的条件不能通过离子束实验来模拟，特别是就离子通量而言。因此，通过欧盟等离子体-壁相互作用特别工作组和国际托卡马克物理活动进行了一项联合尝试，涉及七个不同的聚变装置和等离子体模拟器，以澄清通量相关性。对于每个数据点，局部等离子体条件被归一化为30 eV的冲击能量，小心地选择接近最大产额或室温的表面温度的数据，并在现场执行诊断的校准。通过这个过程，以前的大散射显著减少，显示出随着离子通量Φ的增加，产额下降的明显趋势。在将误差归因于每个数据点之后，使用贝叶斯概率分析进行了拟合，在高离子通量下产生了Φ−为0.54时的侵蚀产额的下降。
The chemical erosion of carbon in interaction with a hydrogen plasma has been studied in detail in ion beam experiments, and erosion yield values are available as a function of ion energy and surface temperature. However, the conditions in the ITER divertor cannot be simulated by ion beam experiments, especially as far as ion flux is concerned. Therefore, a joint attempt was made through the EU Task Force on plasma–wall interaction and the international tokamak physics activity involving seven different fusion devices and plasma simulators to clarify the flux dependence. For each data point the local plasma conditions were normalized to an impact energy of 30 eV, care was taken to select data for a surface temperature close to the maximum yield or room temperature and the calibration of the diagnostic was performed in situ. Through this procedure the previous large scatter was significantly reduced, revealing a clear trend for a decreasing yield with increasing ion flux, Φ. After the attribution of an error to each data point a fit using Bayesian probability analysis was performed, yielding a decrease in the erosion yield with Φ−0.54 at high ion fluxes.