Energy properties and spatial plume profile of ionic liquid ion sources based on an array of porous metal strips  

作　　者：Xinyu LIU Xiaoming KANG Hanwen DENG Yiming SUN 刘欣宇;康小明;邓涵文;孙逸鸣(State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China;Shanghai Frontier Science Center for Gravitational Wave Detection,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China)

机构地区：[1]State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China [2]Shanghai Frontier Science Center for Gravitational Wave Detection,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第12期128-139,共12页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.52075334)。

摘　　要：An ionic liquid ion source(ILIS)is a kind of high brightness ion source capable of providing high-speed positive or negative ion beams.This paper presents a miniaturized ILIS based on an array of porous metal strips.The porous emitter array,integrated with seven 10 mm long strips,is fabricated using wire electrical discharge machining(WEDM)combined with electrochemical etching.The assembled ILIS is 30 mm×30 mm×17.5 mm in size and weighs less than 25 g.A series of experiments,including anⅠ-Ⅴcharacteristic test,a retarding potential analyzer(RPA)test,and a spatial plume distribution test,have been conducted in vacuo to characterize the performance of the ILIS.Results show that the emitted current is up to about 800μA and ion transparency is as high as 94%.Besides,RPA curves reveal that the total fragmentation rate of the emitted particles accounts for 48.8%in positive mode and 59.8%in negative mode.Further,with the increase in applied acceleration voltage,the voltage loss rises while the energy efficiency decreases.It is also found that the plume perpendicular to the strips has a higher divergence than the one parallel to the strips.A numerical simulation by COMSOL reveals that the electric field distribution between the two electrodes results in such a spatial plume profile.

关 键 词：ELECTROSPRAY ionic liquid ion source retarding potential analyzer energy distribution spatial plume profile 

分 类 号：O361[理学—流体力学]