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Imaging electron-optics and spatial-temporal aberrations for a bi-electrode spherical concentric system with electrostatic focusing

Zhang Zhi-Quan Zhang Yi-Fei Zhou Li-Wei Gong Hui

Imaging electron-optics and spatial-temporal aberrations for a bi-electrode spherical concentric system with electrostatic focusing

Zhang Zhi-Quan, Zhang Yi-Fei, Zhou Li-Wei, Gong Hui
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  • Received Date:  22 August 2009
  • Accepted Date:  28 February 2010
  • Published Online:  05 April 2010

Imaging electron-optics and spatial-temporal aberrations for a bi-electrode spherical concentric system with electrostatic focusing

  • 1. (1)Department of Control Enginering, Institute of Armored Force Engineering, Beijing 100072, China; (2)School of Photonics, Beijing Institute of Technology, Beijing 100081,China

Abstract: In the present paper, based on the practical electron ray equation and the electron motion equation,for a bi-electrode concentric spherical system with electrostatic focusing, the spatial-temporal trajectories of moving electrons emitted from the photocathode are obtained, the exact and the approximate formulae for image position and flight time of electrons are deduced. Starting from the solutions of spatial-temporal trajectories, the electron optical spatial-temporal properties of this system are then discussed. A unified definition of spatial-temporal aberrations is given, in which the lateral aberration can be regarded as a combination of paraxial lateral aberration and geometrical lateral aberration; and the temporal aberration can be regarded as a comibination of paraxial temporal aberration and geometrical temporal aberration. All expressions of these corresponding aberrations are deduced.

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