1. [1] A. Foussat et al., IEEE Trans. Appl. Supercond. 26, no. 4, June, 4203605 (2016).
2. [2] N. Koizumi et al., IEEE Trans. Appl. Supercond. 26, no. 4, June, 4203004 (2016).
3. [3] N. Koizumi, H. Kajitani, K. Matsui, T. Hemmi, M. Yamane, S. Ando, M. Nakamoto and K. Takano, Fusion Eng. Des. 124, 99, Nov. (2017). DOI: http://dx.doi.org/10.1016/j.fusengdes.2017.03.083.
4. [4] T. Hemmi et al., IEEE Trans. Appl. Supercond. 27, no. 4, June, 4200105 (2017).
5. [5] N. Koizumi et al., IEEE Trans. Appl. Supercond. 28, no. 3, April, 4203404 (2018).