物理学报Issue(8)：085204-1-085204-7,7.DOI:10.7498/aps.63.085204
霍尔推进器壁面材料二次电子发射及鞘层特性
Characteristics of wall materials secondary electron emission and sheath in Hall thruster
摘要
Abstract
Hall thruster plasma discharge channels interact with wall forming sheath, and different secondary electron emission coefficients of wall material can considerably affect sheath characteristics. In this paper, we establish a two-dimensional physical model in wall sheath area to study the secondary electron emission characteristics of three different wall materials which are boron nitride (BN), silicon carbide (SiC) and aluminium oxide (Al2O3), and SiC material secondary electron emission model is improved. On the basis of improved secondary electron emission model, the relationship between the wall secondary electron emission coefficient and both electron temperature and magnetic field intensity is discussed by the particle in cell simulation method, and the different sheath properties of three materials (BN, SiC and Al2O3), are also investigated. The results show that fitting curve is consistent with the experimental results; at the same electron temperature, the values of secondary electron emission coefficient and electron density of three materials (BN, SiC and Al2O3) increase but the values of sheath electric field and sheath potential drop decrease in their sequence. The BN material has the appropriate secondary electron radiation coefficient, which makes the thruster work steadily under low current condition.关键词
霍尔推进器/壁面材料/鞘层二次电子发射Key words
Hall thruster/wall material/sheath secondary emission引用本文复制引用
段萍,覃海娟,周新维,曹安宁,刘金远,卿少伟..霍尔推进器壁面材料二次电子发射及鞘层特性[J].物理学报,2014,(8):085204-1-085204-7,7.基金项目
国家自然科学基金(批准号:11275034,11375039,11175052,11005025)和辽宁省科学技术计划重点项目(批准号:2011224007)资助的课题.@@@@ Project supported by the National Natural Science Foundation of China (Grant Nos.11275034,11375039,11175052,11005025) and the Key Program of Science and Technology of Liaoning Province, China (Grant No.2011224007) （批准号:11275034,11375039,11175052,11005025）
