Theoretical analysis of the EAST 4-strap ion cyclotron range of frequency antenna with variational theory

Zhang Jia-Hui^{1, 2}, Zhang Xin-Jun^{1, †,}, Zhao Yan-Ping¹, Qin Cheng-Ming^{1, ‡,}, Chen Zhao^{1, 2}, Yang Lei^{1, 2}, Wang Jian-Hua¹

(a) Distribution of |E_y| at the plasma edge for the single antenna; (b) distribution of |E_y| at the plasma edge for the 4-strap antenna array with toroidal phasing (0,0,0,0,) and period Δz = 0.2 m; (c) distribution of |E_y| at the plasma edge for the 4-strap antenna array with toroidal phasing (0,π,0,π) and period Δz = 0.2 m; all with parameters: y₁ = 0.01 m, y₂ = 0.4 m, w = 0.1 m, b₁ = 0.02 m, b₂ = 0.12 m, c = 0.13 m, and d = 0.14 m.