The magnitudes of image aberrations of particle-optical systems are different if the corresponding ion beams fill elliptical or parallelogram-like phase-space areas. Corresponding factors are derived for aberrations of all orders and listed numerically for aberrations up to fifth order. © 1988.
Wollnik, H., & Berz, M. (1988). Image aberrations for beams filling elliptical phase-space areas or volumes. Nuclear Inst. and Methods in Physics Research, A, 263(2–3), 280–282. https://doi.org/10.1016/0168-9002(88)90962-X