Acoustic measurement of a cavitating liquid lithium target for intense neutron source

Kondo, Hiroo*; Kanemura, Takuji*; Furukawa, Tomohiro  ; Hirakawa, Yasushi ; Wakai, Eiichi  ; Ochiai, Kentaro*

A liquid-Li free-surface stream flowing at 15 m/s under a high vacuum of 1E-3 Pa is to serve as a beam target (Li target) for the planned International Fusion Materials Irradiation Facility (IFMIF) or other intense fusion neutron sources. This study focuses on cavitation-like acoustic noise which was detected in a conduit downstream from the Li target. This noise was measured by using acoustic-emission (AE) sensors that were installed at several locations of the conduit via acoustic wave guides, and the continuous wavelet transform (CWT) were performed to characterize the acoustic noise.