Progress of activities in the IFMIF/EVEDA lithium test loop, 2-2; Thickness measurement 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 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. At present, measurements of the Li target thickness at the velocities of up to 20 m/s under an Ar pressure of 10 Pa 0.12 MPa have been finished. The target was found to be approx. 26 mm in thickness on average at the velocity of 15 m/s under a pressure of 0.12 MPa in the region of interest. As for temporal variation, average wave amplitude was 0.3 mm under the same condition 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 analysis of measurement results under the IFMIF condition of 10 Pa are ongoing, and they seem almost identical to the result of 0.12 MPa.