在HL-1M实验中,多发弹丸注入到欧姆加热放电中,明显改善了等离子体约束特性。与相同条件下的欧姆加热放电相比,能量约束时间提高了约30％。等离子体约束的改善是因为弹丸注入后在等离子体中心区域形成了高度峰化的密度和压强分布。实验发现弹丸穿透的深度决定了密度和压强分布的峰化程度,而等离子体中心的磁流体力学活性义随着 In the HL-1M experiment, multiple projectiles were injected into the ohmic heating discharge, which significantly improved the plasma confinement properties. Compared with the ohmic heating discharge under the same conditions, the energy confinement time is increased by about 30%. Plasma confinement is improved because of the highly-peculiar density and pressure distribution in the central plasma region after projectile injection. The experiment found that the penetration depth of the projectile determines the degree of peaking of density and pressure distribution, while the magnetohydrodynamic activity of the plasma center