Electron population properties with different energies in a helicon plasma source

作     者：Zun ZHANG Zhe ZHANG Haibin TANG Jiting OUYANG 张尊;章喆;汤海滨;欧阳吉庭

作者机构：School of Space and EnvironmentBeihang UniversityBeijing 100191People’s Republic of China Key Laboratory of Space Environment Monitoring and Information Processing of MIITPeople’s Republic of China Shanghai Institute of Space PropulsionShanghai Engineering Research Center of Space EngineShanghai 201112People’s Republic of China School of Instrumentation and Optoelectronic EngineeringBeihang UniversityBeijing 100191People’s Republic of China School of PhysicsBeijing Institute of TechnologyBeijing 100081People’s Republic of China 

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

年 卷 期：2021年第23卷第1期

页      面：48-55页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：supported by National Natural Science Foundation of China(Nos.11805011 and 11872093) supported by the Shanghai Engineering Research Center of Space Engine(No.17DZ2280800) 

主　　题：electric propulsion helicon plasma plasma diagnostics optical emission spectroscope electron excitation energy population distribution 

摘      要：The characteristics of electrons play a dominant role in determining the ionization and acceleration processes of *** with electrostatic diagnostics,the optical method is independent of the radio frequency(RF)noise,magnetic field,and electric *** this paper,an optical emission spectroscope was used to determine the plasma emission spectra,electron excitation energy population distributions(EEEPDs),growth rates of low-energy and highenergy electrons,and their intensity jumps with input *** 56 emission lines with the highest signal-to-noise ratio and their corresponding electron excitation energy were used for the translation of the spectrum into *** discrete EEEPD has two clear different regions,namely the low-energy electron excitation region(neutral lines with threshold energy of13–15 eV)and the high-energy electron excitation region(ionic lines with threshold energy?19 e V).The EEEPD variations with different diameters of discharge tubes(20 mm,40 mm,and 60 mm)and different input RF powers(200–1800 W)were *** normalized intensity comparison of the ionic and neutral lines,the growth rate of the ionic population was higher than the neutral one,especially when the tube diameter was less than 40 mm and the input power was higher than 1000 ***,we found that the intensities of low-energy electrons and high-energy electrons jump at different input powers from inductively coupled(H)mode to helicon(W)mode;therefore,the determination of W mode needs to be carefully considered.