Experimental Studies on Spatial Resolution of a Delay-Line Current-Biased Kinetic-Inductance Detector

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

doi:10.1016/j.nima.2025.170425

arXiv · 2504.12361

Experimental Studies on Spatial Resolution of a Delay-Line Current-Biased Kinetic-Inductance Detector

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

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Abstract

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 used a commercial standard Gd Siemens-star pattern as a conventional method to estimate the spatial resolution, and a lab-made 10B-dot array intended to examine detailed profiles on a distribution of spatial resolutions. We found that discrepancy in propagation velocities in the detector affected the uniformity of the spatial resolutions in neutron imaging. We analyzed the ellipsoidal line profiles along the circumferences of several different test circles in the Siemens-star image to find a distribution of spatial resolutions. Note that we succeeded in 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.

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The Dang Vu, Hiroaki Shishido, Kazuya Aizawa, Takayuki Oku, Kenichi Oikawa, Masahide Harada, Kenji M. Kojima, Shigeyuki Miyajima, Kazuhiko Soyama, Tomio Koyama, Mutsuo Hidaka, Soh Y. Suzuki, Manobu M. Tanaka, Masahiko Machida, Shuichi Kawamata, Takekazu Ishida. 2025-04-16. Experimental Studies on Spatial Resolution of a Delay-Line Current-Biased Kinetic-Inductance Detector. https://doi.org/10.1016/j.nima.2025.170425

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