Performance Assessment of Helicon Wave Heating and Current Drive in EXL-50 Spherical Torus Plasmas. - Qiao, G. J.; Luo, D.; Song, S. D.; Dong, J. Q.; Shi, Y. J.; Li, Jingchun; Du, D.; Peng, Y. K. Martin; Liu, M. S. (Journal of Fusion Energy, 2023)