Study on dynamics of W melt-layer splashing generated by a transient heat load simulator with a plasma gun in an external magnetic field

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420854
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: University of Hyogo
• Principal Investigator: Fukumoto Naoyuki 兵庫県立大学, 工学研究科, 准教授 (90275305)
• Co-Investigator(Renkei-kenkyūsha): MIYAZAWA Junichi 核融合科学研究所, 教授 (50300728) ; MASUZAKI Suguru 核融合科学研究所, 教授 (80280593) ; TOKITANI Masayuki 核融合科学研究所, 助教 (30455208)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: タングステン溶融層 / 磁化同軸プラズマガン / プラズマ照射 / プラズマ対向材 / パルス熱負荷

Outline of Final Research Achievements

A magnetized coaxial plasma gun was employed as a powerful transient heat load simulator for material damage tests required in ITER. The high pulsed heat flux can damage pure tungsten samples (W) leading to surface evaporation, cracking, melting, boiling and droplet splashing. The dynamics of W droplet motion was investigated under the externally applied magnetic field by using a high-speed camera. It is found that the magnetic field could decrease the droplet speed and suppress the droplet splashing as the field increases. The suppression efficiency might depend on the direction of the parallel magnetic field. The 2D surface temperature measurement also confirmed that the surface temperature reached up to 3700 K immediately after the plasma exposure.

Free Research Field

プラズマ理工学，特に核融合分野における磁化同軸プラズマガンの開発および応用