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Measurement of Li target thickness in the EVEDA Li Test Loop

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 (IFMIF). The target thickness is required to be maintained within 25 $$pm$$ 1 mm under a vacuum condition of 10$$^{-3}$$ Pa. This paper reports the result of measurements of the Li-target thickness under the IFMIF condition (Li speed of 10 to 20 m/s, vacuum pressure of 10$$^{-3}$$ Pa, Li temperature of 250$$^{circ}$$C) in the EVEDA Li Test Loop. The target thickness was found to be 26.08 mm on average at the speed of 15 m/s at the center of the IFMIF beam footprint. As for temporal fluctuation, average and maximum amplitude at the same measurement position were 0.26 and 1.45 mm, respectively, and more than 99.7% of all amplitudes measured were within the design requirement. Therefore, it was found that the Li target fulfilled the required stability for IFMIF.

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Category:Nuclear Science & Technology

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