Progress of activities in the IFMIF/EVEDA lithium test loop, 2; Thickness measurement of Li target

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

A high-speed (15 m/s) liquid lithium (Li) jet is 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 presentation reports the measurement and analysis 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 measurement result showed that the thickness was approx. 26.0 mm 1.5 mm at the all velocities in the region of interest. Therefore, it was found that the Li target stability under an Ar atmosphere exceeded slightly more than the design requirement. By modeling static pressure gradient, the target thickness was analyzed based on the theory of fluid mechanics. The result showed good agreement with the measurement result, which means the static pressure gradient is a dominant factor for determination of the target thickness.