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) Frequency scans of the antenna impedance Z_A = R + iX in vacuum. The line with black squares represents the resistance of the impedance R = Re(Z_A) and the line with white squares refers to the reactance X = Im(Z_A). (b) Frequency scans of the antenna impedance Z_A = R + iX in the presence of a DH plasma: n_D/n_e = 0.9, n_H/n_e = 0.1, B = 2.3 T, n₀₁ = 3 × 10¹² cm⁻³, n₀ = 2 × 10¹³ cm⁻³, l_n = 0.1 m, the antenna parameters are indicated in Table 1.