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Article
Design of a Multi-Electrode Immersion Lens for Ion-Optical Systems

Authors: F.A.J. Almoudarris --- S.M. Jumaa --- A.K. Ahmad
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2006 Volume: 2 Issue: 1-2 Pages: 27-30
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The present work puts forward an electrostatic optical device for application in an ion-optical system. A design has been achieved computationally for a multi-electrode immersion lens of low relativespherical and chromatic aberration coefficients with the aid of thefollowing suggested expression for the potential field: U(z)=[(a*z)/(z2+c)]+b where a, b, and c are constants, z is the optical axis, and U(z) is the axial potential distribution. These results suggest that operating the proposed lens under zero magnification conditions is more favorable. Therefore, the proposed expression for the potential distribution is recommended for representing an electrostatic immersion lens of low relative chromatic aberration coefficient.


Article
Using the Occupation Numbers of States to Calculate Charge Density Distribution

Authors: Alaa B.K. --- Ehsan M.R.
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2013 Volume: 9 Issue: 2 Pages: 31-36
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Introducing an additional parameter that reflects the difference of theoccupation numbers of states between the real states of the nuclei and thesimple shell model predictions, leads to a very good agreement between thecalculated and experimental results of the CDD and form factors. This leads to the conclusion that proposing as an additional parameter is areal one.

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