Present status of Japanese tasks for lithium target facility under IFMIF/EVEDA, 3; Evaluation of liquid-lithium free-surface flow stability

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

A high-speed (15 m/s) liquid lithium (Li) jet is planned to be utilized as the target of two 40 MeV - 125 mA deuteron beams in the International Fusion Materials Irradiation Facility. The target thickness is required to be maintained within 25 1 mm under a vacuum condition of 10 Pa. This paper presents the measurement results of the Li target thickness at the velocity of 10, 15 and 20 m/s under an Ar pressure of 0.12 MPa. The target was found to be rather smooth and approx. 26 mm in thickness on average at the all velocities in the region of interest. As for temporal variation, average wave amplitude was 0.3 mm at the all velocities in the same region. Therefore, it was found that the Li target stability was completely within the requirement on average under an Ar pressure of 0.12 MPa. The next step is to measure the Li target under the IFMIF condition of 10 Pa.