Mohammed. K. A. AL- Janan and R. Y. J. AL-Salih 2023. Design and studying the effect of Polepiece shape on the magnetic and optical properties of the unipolar lens. Tikrit Journal of Pure Science. 27, 6 (Jan. 2023), 63–69. DOI:https://doi.org/10.25130/tjps.v27i6.760.