A new design for imaging of fast energetic electrons
- Skruszewicz, S.
- Passig, J.
- Przystawik, A.
- Truong, N. X.
- Köther, M.
- Tiggesbäumker, J.
- Meiwes-Broer, K.-H.
DOIAbstract
We report on an essentially improved version of the classical Eppink–Parker velocity map imaging spectrometer design (Rev. Sci. Instrum. 68, 3477 (1997)). By adding electrostatic lenses with an opposite polarity to the extraction system we succeeded in extending the range of detection of energetic particles up to the keV regime at moderate (<20 kV) extraction voltage conditions. Simulations show that the electrostatic lens system acts in analogy to an achromatic lens in optics and leads to a reduction in the chromatic energy aberration. For comparison to other setups a transmission parameter of the extraction system is defined denoting the maximum kinetic energies of particles which can be analyzed. Detector size and spectrometer length onl...
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