CST – Computer Simulation Technology

Electromagnetic Evaluation of HTS RF Coils for Nuclear Magnetic Resonance
T. Yamada, A. Saito, S. Oikawa, K. Koshita, M. Takahashi, H. Maeda, S. Ohshima
IEEE Transactions on Applied Superconductivity
Volume: 25 Issue: 3
NMR RF coil, quality factor, high temperature superconductors, two frequency, in-phase mode, out-phase mode
We propose a Helmholtz-type probe coil that uses a high-temperature superconductor (HTS) for use as 700-MHz NMR RF coils with a high unloaded quality factor (Qu). We analyzed the microwave resonant properties of a one-turn coil set face-to-face. The coils were made of a YBa2Cu3O7-d (YBCO) film deposited on an r-plane sapphire substrate. The film thickness was 300 nm. The resonant frequency was found to split into an in-phase (lower frequency) and out-phase (higher frequency) modes. We focused on the self-resonant frequency of the one-turn coil. We simulated the horizontal magnetic field caused by the RF coil. Although the coil could generate a sufficiently large transverse magnetic field in the in-phase mode, such a large field could not be generated in the out-phase mode. Therefore, we decided to use the in-phase mode. We also measured and simulated Qu to confirm that it was large enough for use in the 700-MHz NMR system.

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