Finite difference computer simulation of two diverging electrostatic analyzers: The soft particle spectrometer and the spectrographic particle imager
作者:
M. J. Sablik,
J. D. Winningham,
V. A. Blevins,
期刊:
Review of Scientific Instruments
(AIP Available online 1985)
卷期:
Volume 56,
issue 9
页码: 1727-1733
ISSN:0034-6748
年代: 1985
DOI:10.1063/1.1138132
出版商: AIP
数据来源: AIP
摘要:
We have completed a finite difference computer simulation of two diverging electrostatic analyzers. In both analyzers, the deflecting plates are cylindrical surfaces which flare out from each other like two arms of a hyperbola. The analyzers are the soft particle spectrometer (SPS) and the spectrographic particle imager (SPI), which correspond, respectively, to an energy spectrometer and an energy spectrograph. The simulation consists of two steps: (1) a finite difference computation of the electrostatic potential field inside the instrument; and (2) a ray‐tracing computation in which many particles are ray traced through the instrument and statistics are gathered on the particles that make it to the collecting region. In both cases, the simulation is two‐dimensional, restricted to the central plane of the instrument. This limitation turns out to be unimportant because the statistics acquired during simulation agree well with experimentally acquired statistics for each instrument. In the case of SPI, the computer simulation has been used to provide information on how variation of geometric parameters affects the quantities that describe a good spectrograph.
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