磁场梯度对Hall推力器放电特性影响的实验研究  

On the effect of magnetic field gradient on the discharge characteristics of Hall thrusters

作　　者：鄂鹏[1] 段萍[2] 江滨浩[1] 刘辉[1] 魏立秋[1] 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程系,哈尔滨150001 [2]大连大学物理科学与技术学院,大连116622

出　　处：《物理学报》2010年第10期7182-7190,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10975026;50877018);辽宁省教育厅高校科研基金(批准号:2006A047);哈尔滨工业大学科研创新基金(批准号:2009044);黑龙江省博士后科学基金(批准号:LBH-Z09161)资助的课题~~

摘　　要：为进一步探索Hall推力器通道内磁场优化设计理论,通过实验分析了强场区磁场梯度对推进剂的电离与加速等放电过程的影响.研究发现,在本实验设计的磁场梯度范围内,磁场梯度大小对推进剂的电离过程影响较小,但是对离子流的加速特性会产生较为明显的影响.随着磁场梯度的增加,离子束的能量分布会趋于集中,推力器效率提高.最后,对磁场轴向梯度进一步变大可能会引起的一系列物理问题如有限Larmor半径效应、电子传导机理转变规律和梯度漂移效应等进行了分析和思考。An experiment was performed to investigate how the magnetic field gradient in strong field zone affects the discharge processes of Hall thrusters,such as the ionization and acceleration of propellants,for further research on optimal design theory of magnetic field in discharge channels of Hall thrusters.The results show that magnetic field strength has little effect on the ionization of propellants within the designed range of magnetic field gradient,but has significant influence on the acceleration of ions.With the increase of magnetic field gradient,the ion-beam energy distribution tends to be concentrated,and the thrust efficiency tends to rise.Finally,further increase of magnetic field gradient may lead to a series of physical problems,among whith such as the finite Larmor radius effect,the changes in the law of electronic conduction mechanism,and the magnetic field gradient drift are analyzed.

关 键 词：Hall推力器 磁场梯度 放电特性 

分 类 号：O531[理学—等离子体物理]