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Temporal and spatial study of differently charged ions emitted by ns-laser-produced tungsten plasmas using time-of-flight mass spectroscopy

Temporal and spatial study of differently charged ions emitted by ns-laser-produced tungsten plasmas using time-of-flight mass spectroscopy

作     者:Ding WU George C-Y CHAN Xianglei MAO Yu LI Richard E RUSSO Hongbin DING Vassilia ZORBA 吴鼎;George C-Y CHAN;毛向雷;李裕;Richard E RUSSO;丁洪斌;Vassilia ZORBA

作者机构:School of PhysicsDalian University of TechnologyDalian 116024People's Republic of China Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States of America Department of Mechanical EngineeringUniversity of CaliforniaBerkeleyCA 94720United States of America 

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9期

页      面:176-183页

核心收录:

学科分类:080901[工学-物理电子学] 07[理学] 0809[工学-电子科学与技术(可授工学、理学学位)] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 070204[理学-等离子体物理] 0803[工学-光学工程] 0702[理学-物理学] 

基  金:supported by the National Key R&D Program of China(No.2017YFE0301304) National Natural Science Foundation of China(No.12005034) the China Postdoctoral Science Foundation(No.2019M661087)supported by the US Department of Energy,Office of Defense Nuclear Nonproliferation Research and Development,under contract number DE-AC02-05CH11231 at the Lawrence Berkeley National Laboratory 

主  题:laser ablation temporal and spatial evolution time-of-flight mass spectroscopy spatial separation differently charged ions 

摘      要:Tungsten(W)is an important material in tokamak walls and *** W ion charge state distribution and the dynamic behavior of ions play important roles in the investigation of plasma–wall interactions using laser-ablation-based diagnostics such as laser-induced breakdown spectroscopy and laser-induced ablation *** this work,we investigate the temporal and spatial evolutions of differently charged ions in a nanosecond-laser-produced W plasma in vacuum using time-of-flight mass *** with different charge states from 1 to 7(W+to W7+)are all *** temporal evolutions of the differently charged ions show that ions with higher charge states have higher velocities,indicating that space separation occurs between the differently charged ion ***-resolved mass spectroscopy measurements further demonstrate the separation *** temporal profile can be accurately fitted by a shifted Maxwell–Boltzmann distribution,and the velocities of the differently charged ions are also obtained from the *** is found that the ion velocities increase continuously from the measured position of 0.75 cm to 2.25 cm away from the target surface,which indicates that the acceleration process lasts through the period of plasma *** acceleration and space separation of the differently charged ions confirm that there is a dynamic plasma sheath in the laser-produced plasma,which provides essential information for the theoretical laser-ablation model with plasma formation and expansion.

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