A low-energy ion spectrometer(LEIS) for use aboard three-axis stabilized spacecraft has been developed to measure ion energy per charge distribution in three-dimensional space with good energy-, angular-and temporal-r...A low-energy ion spectrometer(LEIS) for use aboard three-axis stabilized spacecraft has been developed to measure ion energy per charge distribution in three-dimensional space with good energy-, angular-and temporal-resolutions. For the standard top-hat electrostatic analyzer used widely in space plasma detection, three-axis stabilized spacecraft makes it difficult to obtain complete coverage of all possible ion arrival directions. We have designed angular scanning deflectors supplementing to a cylindrically symmetric top-hat electrostatic analyzer to provide a half-space field of view as 360°×90°(–45°–+45°), and fabricated the LEIS flight model for detecting magnetospheric ions in geosynchronous orbit. The performance of this payload has been evaluated in detail by a series of simulation and environmental tests, and the payload has also been calibrated through laboratory experiments using a low-energy ion source. The results show that capabilities of the LEIS payload are in accordance with the requirements of a magnetospheric mission.展开更多
针对分割半球形和顶盖形静电分析器的缺点,提出了一种新型的内外分离式静电分析器,并使用粒子仿真模拟的方法分析了内外分离式静(separate-internal-external type electrostatic analyzer,SIETESA)电分析器的各项性能。结果表明该静电...针对分割半球形和顶盖形静电分析器的缺点,提出了一种新型的内外分离式静电分析器,并使用粒子仿真模拟的方法分析了内外分离式静(separate-internal-external type electrostatic analyzer,SIETESA)电分析器的各项性能。结果表明该静电分析器由于可独立控制电极的数量的增加,具有动态通量响应范围,其几何因子(相当于仪器灵敏度)能够实现一个数量级的连续变化,并且具有高的能量分辨率、俯仰角分辨率和方位角分辨率,能有效避免分割半球形静电分析器电极之间电压击穿的风险和顶盖形静电分析器的散焦问题。展开更多
A prototype laser ion source that could demonstrate the possibility of producing intense pulsed high charge state ion beams has been established with a commercial Nd：YAG laser （E =3 J, 1064 rim, ~ 10 ns） to produce...A prototype laser ion source that could demonstrate the possibility of producing intense pulsed high charge state ion beams has been established with a commercial Nd：YAG laser （E =3 J, 1064 rim, ~ 10 ns） to produce laser plasma for the research of Laser Ion Source （LIS）. At the laser ion source test bench, high purity （99.998%） aluminum and lead targets have been tested for laser plasma experiment. An Electrostatic Ion Analyzer （EIA） and Electron Multiply Tube （EMT） detector were used to analyze the charge state and energy distribution of the ions produced by the laser ion source. The maximum charge states of A112＋ and Pb7＋ were achieved. The results will be presented and discussed in this paper.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.41327802)the CAS Key Research Program of Frontier Sciences(Grant No.QYZDB-SSW-DQC015)
文摘A low-energy ion spectrometer(LEIS) for use aboard three-axis stabilized spacecraft has been developed to measure ion energy per charge distribution in three-dimensional space with good energy-, angular-and temporal-resolutions. For the standard top-hat electrostatic analyzer used widely in space plasma detection, three-axis stabilized spacecraft makes it difficult to obtain complete coverage of all possible ion arrival directions. We have designed angular scanning deflectors supplementing to a cylindrically symmetric top-hat electrostatic analyzer to provide a half-space field of view as 360°×90°(–45°–+45°), and fabricated the LEIS flight model for detecting magnetospheric ions in geosynchronous orbit. The performance of this payload has been evaluated in detail by a series of simulation and environmental tests, and the payload has also been calibrated through laboratory experiments using a low-energy ion source. The results show that capabilities of the LEIS payload are in accordance with the requirements of a magnetospheric mission.
文摘针对分割半球形和顶盖形静电分析器的缺点,提出了一种新型的内外分离式静电分析器,并使用粒子仿真模拟的方法分析了内外分离式静(separate-internal-external type electrostatic analyzer,SIETESA)电分析器的各项性能。结果表明该静电分析器由于可独立控制电极的数量的增加,具有动态通量响应范围,其几何因子(相当于仪器灵敏度)能够实现一个数量级的连续变化,并且具有高的能量分辨率、俯仰角分辨率和方位角分辨率,能有效避免分割半球形静电分析器电极之间电压击穿的风险和顶盖形静电分析器的散焦问题。
基金Supported by China Nature Science Foundation(10921504,11275239)
文摘A prototype laser ion source that could demonstrate the possibility of producing intense pulsed high charge state ion beams has been established with a commercial Nd：YAG laser （E =3 J, 1064 rim, ~ 10 ns） to produce laser plasma for the research of Laser Ion Source （LIS）. At the laser ion source test bench, high purity （99.998%） aluminum and lead targets have been tested for laser plasma experiment. An Electrostatic Ion Analyzer （EIA） and Electron Multiply Tube （EMT） detector were used to analyze the charge state and energy distribution of the ions produced by the laser ion source. The maximum charge states of A112＋ and Pb7＋ were achieved. The results will be presented and discussed in this paper.
