Application of Kelvin Probe to Studies of Fusion Reactor Materials under Irradiation

作     者：罗广南 K.Yamaguchi T.Terai M.Yamawaki 

作者机构：Department of Quantum Engineering and Systems Science Graduate School of EngineeringThe University of Tokyo7-3-1 KongoBunkyo-kuTokyo 113-8656Japan Neutron Science Rearch Center Japan Atomic Energy Research Institute2-4 ShirakataTokai-muraIbaraki319-1195Japan 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2005年第7卷第4期

页      面：2982-2984页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

主　　题：fusion reactor materials work function irradiation 

摘      要：Recently, the work function （WF） changes in metallic and ceramic materials to be potentially used in future fusion reactors have been examined by means of Kelvin probe （KP）, under He ion irradiation in high energy （MeV） and / or low energy （500 eV） ranges. The results of polycrystalline Ni samples indicate that the 1 MeV beam only induces decrease in the WF within the experimental fluence range; whereas the irradiation of 500 eV beam results in decrease in the WF firstly, then increase till saturation. A dual layer surface model is employed to explain the observed phenomena, together with computer simulation results by SRIM code. Charges buildup on the surface of lithium ceramics has been found to greatly influence the probe output, which can be explained qualitatively using a model concerning an induction electric field due to external field and free charges on the ceramic surface.