Robust optimization for magnetic lens design

C. J. Edgcombe; A. R. Lupini; J. H. Taylor

doi:10.1016/S0168-9002(98)01537-X

Robust optimization for magnetic lens design

C. J. Edgcombe, A. R. Lupini, J. H. Taylor

Research output: Contribution to journal › Conference article › peer-review

6 Scopus citations

Abstract

When the dimensions of magnetic lenses are optimized for the best value of a given target function, the method used should be robust in the presence of numerical noise, should allow constraints to be applied and as far as possible should locate global minima rather than local ones. We describe the use of the complex method to minimize the chromatic aberration of a magnetic lens. Geometric parameters were varied by a shell program, while the magnetic solution and aberration calculation were carried out by the CIELAS2 analysis software. The chromatic aberration coefficient was reduced from 1.61 to 0.68 mm, while satisfying given constraints. The method can be applied to optimise any set of lens properties whose numerical values can be combined in to a figure of merit.

Original language	English
Pages (from-to)	306-309
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	427
Issue number	1-2
DOIs	https://doi.org/10.1016/S0168-9002(98)01537-X
State	Published - May 1999
Externally published	Yes
Event	Proceedings of the 1998 5th International Conference on Charged Particle Optics (CPO-5) - Delft, Neth Duration: Apr 14 1998 → Apr 17 1998

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10.1016/S0168-9002(98)01537-X

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abstract = "When the dimensions of magnetic lenses are optimized for the best value of a given target function, the method used should be robust in the presence of numerical noise, should allow constraints to be applied and as far as possible should locate global minima rather than local ones. We describe the use of the complex method to minimize the chromatic aberration of a magnetic lens. Geometric parameters were varied by a shell program, while the magnetic solution and aberration calculation were carried out by the CIELAS2 analysis software. The chromatic aberration coefficient was reduced from 1.61 to 0.68 mm, while satisfying given constraints. The method can be applied to optimise any set of lens properties whose numerical values can be combined in to a figure of merit.",

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T1 - Robust optimization for magnetic lens design

AU - Edgcombe, C. J.

AU - Lupini, A. R.

AU - Taylor, J. H.

PY - 1999/5

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N2 - When the dimensions of magnetic lenses are optimized for the best value of a given target function, the method used should be robust in the presence of numerical noise, should allow constraints to be applied and as far as possible should locate global minima rather than local ones. We describe the use of the complex method to minimize the chromatic aberration of a magnetic lens. Geometric parameters were varied by a shell program, while the magnetic solution and aberration calculation were carried out by the CIELAS2 analysis software. The chromatic aberration coefficient was reduced from 1.61 to 0.68 mm, while satisfying given constraints. The method can be applied to optimise any set of lens properties whose numerical values can be combined in to a figure of merit.

AB - When the dimensions of magnetic lenses are optimized for the best value of a given target function, the method used should be robust in the presence of numerical noise, should allow constraints to be applied and as far as possible should locate global minima rather than local ones. We describe the use of the complex method to minimize the chromatic aberration of a magnetic lens. Geometric parameters were varied by a shell program, while the magnetic solution and aberration calculation were carried out by the CIELAS2 analysis software. The chromatic aberration coefficient was reduced from 1.61 to 0.68 mm, while satisfying given constraints. The method can be applied to optimise any set of lens properties whose numerical values can be combined in to a figure of merit.

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U2 - 10.1016/S0168-9002(98)01537-X

DO - 10.1016/S0168-9002(98)01537-X

M3 - Conference article

AN - SCOPUS:0345102518

SN - 0168-9002

VL - 427

SP - 306

EP - 309

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

IS - 1-2

T2 - Proceedings of the 1998 5th International Conference on Charged Particle Optics (CPO-5)

Y2 - 14 April 1998 through 17 April 1998

ER -

Robust optimization for magnetic lens design

Abstract

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