Experimental studies on spatial resolution of a delay-line current-biased kinetic inductance detector

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

A current-biased kinetic inductance detector (CB-KID) is a novel superconducting detector to construct a neutron transmission imaging system. The characteristics of a superconducting neutron detector have been systematically studied to improve spatial resolution of our CB-KID neutron detector. In this study, we investigated the distribution of spatial resolutions under different operating conditions and examined the homogeneity of spatial resolutions in the detector in detail. We found that controlling the detector temperature precisely enough to realize stable propagation velocities of the signals in the detector to achieve the best spatial resolution with a delay-line CB-KID technique.