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论文类型：期刊论文

发表时间：2020-03-01

发表刊物：Vacuum

收录刊物：EI

卷号：173

ISSN号：0042207X

关键字：W nano-fuzz growth; ITER-revelant; ELMs; He/D ion irradiations; W divertor

摘要：The intermittent He/D ion irradiations of polycrystalline W have been performed at the ion energy of 50 eV by changing the time of the single irradiations and the irradiation temperature. All irradiated W specimens have been observed by scanning electron microscopy, and the effect of intermittent He/D ion irradiations on the W fuzz growth has been analyzed. The W fuzz growth over W targets does not show the clear dependence on the intermittent He/D ion irradiations, where the He/D ion fluence of the single irradiations typically varies from 5.0 �� 1024 to 2.5 �� 1025/m2. However, a slight change in the W surface temperature during the single He ion irradiations significantly affects the W fuzz growth rate. Analysis indicates that W fuzz growth is significantly affected by the total He ion fluence varying from 5.0 �� 1024 to 5.0 �� 1025/m2 and the irradiation temperature varying from 1100 to 1450 K. This current study will play a crucial role in understanding the W fuzz growth under the periodic He/D ion irradiations of W divertor in fusion reactors, such as ELMs. ? 2019 Elsevier Ltd