Evaluation of superconducting pickup coils with high Q for 700 MHz NMR

11th European Conference on Applied Superconductivity

Oikawa, Satoshi^1 ; Tanaka, Yuto^1 ; Yamada, Takahiro^1 ; Kanamaru, Akira^2 ; Takahashi, Masato^3 ; Saito, Atsushi^1 ; Ohshima, Shigetoshi^1

Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yamagata, Yonezawa

992-8510, Japan^1

Graduate School of Life Science and Nano Systems, Yokohama City University, Kanagawa 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama

230-0045, Japan^2

RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Kanagawa, Yokohama

230-0045, Japan^3

关键词: Cu thin film;    DyBa2Cu3O7;    High quality factors;    High sensitivity;    High temperature superconductor (HTS);    NMR measurements;    Normal metals;    Pick-up coils;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/4/042028/pdf
DOI  :  10.1088/1742-6596/507/4/042028

来源: IOP

【 摘 要 】

In this study, we propose a helmholtz-type coil using a high-temperature superconductor (HTS) for 700 MHz NMR pickup coils with a high quality factor (Q). We analyzed the coil microwave resonant properties of the helmholtz-type one turn coil made using an HTS (DyBa2Cu3O7-δ: DyBCO coil) and the same type of coil made from normal metal (Cu coil) through electromagnetic simulations. The Q of the DyBCO coil at 77 K and the Cu coil at 77 K were 3295 and 482 in the simulations. The one turn coils were fabricated using 200-μm-thick DyBCO thin film deposited on an r-sapphire substrate and 3m-thick Cu thin film on an r-sapphire substrate. The Q of the DyBCO coil was 2920 at 77 K, and that of the Cu coil was 423 at 77 K. These experimental results indicate that the DyBCO coils are more advantageous than the Cu coils for high-sensitivity NMR measurements.