Discontinuity of mode transition and hysteresis in hydrogen inductively coupled plasma via a fluid model

• 作者: 张钰如 徐会静 李雪春 王友年 赵书霞 高飞
• 来源期刊: 中国物理B（英文版）
• 关键词: inductively coupled plasmas mode transition hysteresis fluid simulation
• 年，卷（期）: 2015,（11）
• 页码范围: 115201-1-115201-7
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/11/115201

摘要

A new type of two-dimensional self-consistent fluid model that couples an equivalent circuit module is used to in-vestigate the mode transition characteristics and hysteresis in hydrogen inductively coupled plasmas at different pressures, by varying the series capacitance of the matching box. The variations of the electron density, temperature, and the cir-cuit electrical properties are presented. As cycling the matching capacitance, at high pressure both the discontinuity and hysteresis appear for the plasma parameters and the transferred impedances of both the inductive and capacitive discharge components, while at low pressure only the discontinuity is seen. The simulations predict that the sheath plays a determi-native role on the presence of discontinuity and hysteresis at high pressure, by influencing the inductive coupling efficiency of applied power. Moreover, the values of the plasma transferred impedances at different pressures are compared, and the larger plasma inductance at low pressure due to less collision frequency, as analyzed, is the reason why the hysteresis is not seen at low pressure, even with a wider sheath. Besides, the behaviors of the coil voltage and current parameters during the mode transitions are investigated. They both increase (decrease) at the E to H (H to E) mode transition, indicating an improved (worsened) inductive power coupling efficiency.