Activities summary on lithium target system and test facilities in IFMIF/EVEDA project, 2; Flow stability of Li target

Kanemura, Takuji; Kondo, Hiroo; Furukawa, Tomohiro  ; Hirakawa, Yasushi ; Hoashi, Eiji*; Yoshihashi, Sachiko*; Horiike, Hiroshi*; Wakai, Eiichi  

A high-speed (15 m/s) liquid lithium jet is planned to serve as the target of two 40 MeV - 125 mA deuteron two-beams in the International Fusion Materials Irradiation Facility (IFMIF). The target thickness is required to be maintained within 25 1 mm under a vacuum condition of 10 Pa. In this study, we report the result of measurements of the Li target thickness under the IFMIF condition (Li speed of 15 m/s, vacuum pressure of 10 Pa, Li temperature of 250 C) in the EVEDA Li Test Loop. The target was found to be adequately smooth on average inside the corresponding IFMIF beam footprint. The measurement result of temporal fluctuations showed they were dominated by small waves with amplitude of less than 1 mm, and that the average amplitude at the center of beam footprint was 0.26 mm. Therefore, it was found that the Li target fulfilled the required stability for IFMIF.