中文摘要：

采用直流电源放电形成高功率脉冲非平衡磁控溅射（dc-high power impulse unbalanced magnetron sputtering,dc-HPPUMS或dc-HiPiUMS）,利用雪崩放电的击穿机理形成深度自触发放电,同轴线圈和空心阴极控制放电特性和提高功率密度.磁阱俘获雪崩放电形成的二次电子和形成漂移电流,形成了大电流脉冲放电,放电脉冲电流密度峰值超过100A/cm2,脉冲频率小于40Hz.由于放电等离子体远没有达到平衡状态,放电电流主要受到空间电荷效应的限制,采用放电理论分析了形成高电离率和强脉冲电流的机理,采用蔡尔德定律计算的放电参数符合实验的结果.

英文摘要：

High Power impulse Unbalanced Magnetron Sputtering has been coupled to a direct current source （ dc-HPPUMS or dc-HiPUMS）. A coaxial coil and an attached hollow cathode were applied to control discharge properties and improve pulsed power density. A large extent breakdown was induced for avalanche discharge mechanism. The magnetic trap on sputtering target traps the secondary electrons excited by the avalanche and forms a drift current in magnetic trap. The peak pulse current density is higher than 100 A /cm2 with a pulse frequency less than 40 Hz. The space charge limited condition controls the discharge for plasma far away from equilibrium. The discharge theory was taken to describe the high ionization mechanism in dc-HPPUMS discharge. The parameters deduced from Child law agree with the experimental results.