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Shape design of magnetic circuit of the magnetic lens based on medial axis transform
He Chen1, Quanlin Dong1, Xiaomeng Liu1
1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China; Key Laboratory of Micro-Nano Measurement-Manipulation and Physics, China.
Abstract:
This paper proposes a method of designing a magnetic lens circuit based on axial transform theory. A unified mathematical description of the magnetic circuit profile is given within a medial axial transform in differential geometry. The objective constraint and geometric constraint equations of the magnetic circuit form a closed set of differential equations. Lastly, the optimized magnetic circuit is obtained using the solutions of the equations. The optical performance of the magnetic lens is significantly improved.
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