講演情報
[18a-M_107-2]Effect of surface treatment on the nano-Tendril Bundle (NTB) formation
〇(PC)Fabien Sanchez1, Shin Kajita2, Hirohiko Tanaka3, Ryoji Mano4, Shoma Hirata4, Hayashi Koki4, Ryo Yasuhara1,5, Quan Shi2, Noriyasu Ohno4, Hiyori Uehara1,5 (1.National Institute for Fusion Science, Toki 509-5292, Japan, 2.Graduate School of Frontier Sciences, University of Tokyo, Kashiwa 277-8561, Japan, 3.Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8603, Aichi, Japan, 4.Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan, 5.The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki, Gifu 509-5202, Japan)
キーワード：
Helium plasma irradiation、Nano-tendril bundles (NTB)、Nanopatterning
In fusion reactors, helium (He) ions will bombard tungsten (W) divertor components. Injecting impurity gases like Neon (Ne) will reduce the heat loads on the divertor, but leads to nanostructures known as nano-tendril bundles (NTB). However, these structures can degrade the plasma divertor properties and increase arcing. Yet, the NTB formation mechanisms remain unclear.
This study, for the first time, exposes W substrates to He plasma containing Ne at various fluences to investigate NTB growth, focusing on the early-stage mechanisms that lead to final NTB formation. Prior to irradiation, W substrates were vacuum annealed, roughened using abrasive papers, or not subject to pre-treatment. Surface topography before and after irradiation was characterized using scanning electron microscopy (SEM) and confocal laser microscopy. New findings and the effect of treated surfaces on these structures will be presented, along with proposed formation mechanisms.
This study, for the first time, exposes W substrates to He plasma containing Ne at various fluences to investigate NTB growth, focusing on the early-stage mechanisms that lead to final NTB formation. Prior to irradiation, W substrates were vacuum annealed, roughened using abrasive papers, or not subject to pre-treatment. Surface topography before and after irradiation was characterized using scanning electron microscopy (SEM) and confocal laser microscopy. New findings and the effect of treated surfaces on these structures will be presented, along with proposed formation mechanisms.