Bedington, R; Kataria, D; Smith, A; (2015) A miniaturised, nested-cylindrical electrostatic analyser geometry for dual electron and ion, multi-energy measurements. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 793 pp. 92-100. 10.1016/j.nima.2015.04.067.

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Abstract

The CATS (Cylindrical And Tiny Spectrometer) electrostatic optics geom- etry features multiple nested cylindrical analysers to simultaneously measure multiple energies of electron and multiple energies of ion in a conguration that is targeted at miniaturisation and MEMS fabrication. In the prototyped model, two congurations of cylindrical analyser were used, featuring terminating side- plates that caused particle trajectories to either converge (C type) or diverge (D type) in the axial direction. Simulations show how these dierent electrode congurations aect the particle focussing and instrument parameters; C-type providing greater throughputs but D-type providing higher resolving powers. The simulations were additionally used to investigate unexpected plate spacing variations in the as-built model, revealing that the K-factors are most sensitive to the width of the inter-electrode spacing at its narrowest point.

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