离子推力器放电室阳极壁面电流密度分布特性研究

Studies on Distribution Characteristics of CurrentDensity on Anode Wall of Ion Thruster

关键词:  离子推力器  阳极壁面  电流密度分布  等离子体诊断

Key words:  Ion thruster  Anode wall  Current density distribution  Plasma diagnosis

摘要:

为了准确掌握离子推力器放电室阳极壁面电流密度分布特性，并深入理解阳极壁面处等离子体运动特性，设计了近阳极壁面等离子体诊断的具体实施方案，并基于LIPS-200离子推力器开展了近阳极壁面处等离子体诊断试验研究，得到了主要磁极附近壁面等离子体参数，并得到阳极壁面吸收电流密度分布特性。试验结果表明：LIPS-200离子推力器阳极壁面处主要磁极附近的等离子体密度范围为，测试点的电子温度范围为，壁面电流密度范围为；柱段壁面电子温度相对锥段较低，但电流密度较大，尤其在中间极靴位置电流密度最大，约为阴极极靴处电流密度的3倍，约为屏栅极靴处电流密度的2倍，阳极电流主要在放电室中间极靴处发生损失。

Abstract:

In order to accurately grasp the current density distribution characteristics on the anode wall surface of the ion thruster discharge chamber, and to deeply understand the plasma motion characteristics near the anode wall, a specific implementation scheme for the near-anode wall plasma diagnosis was designed. Based on LIPS-200 ion thruster, plasma diagnostic test near the anode wall was carried out. The plasma parameters near the main magnetic pole were obtained, and the wall current density characteristics near the main magnetic poles were also obtained. The test results show that the plasma characteristics near the main magnetic pole at the anode wall of the LIPS-200 ion thruster are as follows: the plasma density range is from to , the electron temperature ranges from to , and the wall current density ranges from to . The electron temperature of the wall of the cylinder section is lower than that of the cone section, but the current density is higher, especially at the position of the middle pole piece，which is 3 times of the current density at the cathode pole piece and 2 times of the current density at the screen pole piece. The anode current is mainly lost at the middle pole piece of the discharge chamber.