Neutron transmission CB-KID imager using samples placed at room temperature

Ishida, Takekazu*; Vu, TheDang*   ; Shishido, Hiroaki*; Aizawa, Kazuya  ; Oku, Takayuki   ; Oikawa, Kenichi   ; Harada, Masahide   ; Kojima, Kenji M*; Miyajima, Shigeyuki*; Koyama, Tomio*; Soyama, Kazuhiko  ; Hidaka, Mutsuo*; Suzuki, Soh Y*; Tanaka, Manobu M*; Machida, Masahiko  ; Kawamata, Shuichi*

We built a new cryostat to apply a current-biased kinetic inductance detector (CB-KID) for conducting neutron transmission imaging of room temperature samples under pulsed neutrons. A Wood's metal alloy of melting temperature 75.2C was placed at room temperature to inspect the measurement system at J-PARC. Since one of the four phases of Wood's metal is a fine Cd-rich needle phase (width 25 m and length 5 mm), it is suitable for observing fine mosaic structure selectively by neutron imaging. The spatial resolution of the CB-KID imager was estimated as 10 m by using a Gd Siemens-star pattern. The CB-KID system is useful to conduct transmission imaging for various materials rather easily at room temperature.