Transient Behavior of Negative Hydrogen Ion Extraction from Plasma

作     者：蓝朝晖Institute of Fluid Physics China Academy of Engineering Physics 彭宇飞 杨振 龙继东 

作者机构：Institute of Fluid PhysicsChina Academy of Engineering Physics 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2013年第15卷第9期

页      面：945-949页

核心收录：

学科分类：0710[理学-生物学] 071010[理学-生物化学与分子生物学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 0702[理学-物理学] 

基　　金：supported by National Natural Science Foundation of China(No.11105130) 

主　　题：negative hydrogen ion particle-in-cell simulation ion source ion extraction 

摘      要：For plasma source, the extraction of negative ions is quite different from that of positive ions. To understand the effect of extraction field on plasma, the time-dependent behavior of negative hydrogen ion extraction from a negative ion source has been studied by particle-in-cell simulation in the collisionless limit. The simulations have shown that, due to the difference in dynamics between electrons and ions, the imbalance of the numbers of charged particles occurs in the source, results in the broadening of plasma sheath and the great increase of plasma potential. The resultant high sheath field and the ambipolar electric field in plasma make the negatively charged particles congregate inside the sheath and move toward the extraction outlet. The emission area of negative ions is much smaller than that of the extraction aperture, which is in sharp contrast to the case of positive ion extraction.