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DETERMINATION OF THE MOST FAVORABLE SHAPES FORTHE CYLINDRICAL CONCAVE ELECTROSTATICQUADRUPOLE LENS | ||
| Journal of Al-Nahrain University - Science | ||
| Article 1, Volume 12, Issue 3, 2009, Pages 86-93 | ||
| Author | ||
| Oday A. Hussein | ||
| Abstract | ||
| AbstractThe optimum design of electrostatic quadrupole lens of cylindrical concave electrodes iscomputed with the aid of transfer matrices method, where the axial field distribution and the opticalproperties are determined.The trajectory equation of motion in Cartesian coordinates is solved and the path of charged -particles beam traversing the axial field is determined. Then the beam trajectory along the lens axisis used to calculate the optical properties of the lens.The optimization calculations are made to find the optimum optical properties and the design ofan electrode shape of lens. The calculation procedure include determination both of electrode shapeparameter and excitation, then the aberration parameters in both horizontal and vertical planesalong the optical axis are computed.Both spherical and chromatic aberration coefficients are reduced via changing the geometricalshapes of electrodes by taking the different gap angles of electrode into account. The results showthat the choice of the limited value of the gap angle gives us the optimum optical properties and thebest values of the aberration coefficients. | ||
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