Particle Confinement Properties of Lower Hybrid Current DrivePlasma on the HL-1 Tokamak

The particle confinement property of LHCD (lower hybrid current drive) plasma on the HL-1 tokamak is mainly affected by the line-averaged density of electrons (n_e). With n_e < 2.0 x 10¹³cm^-3 the particle confinement time (T_P)is improved with the suppression of H_α(D_α) fluctuation at the edge, and tends to increase with the power P_LH. The peak of T_p appears near the critical density ( 1.0x10¹³cm^-3). These results are not influenced by the current drive directions.