Investigation of the accuracy of ion optics simulations using Kepler orbits in a spherical capacitor

Zouros, T. J. M.; Sise, Omer; Spiegelhalder, F. M.; Manura, David J.

doi:10.1016/j.ijms.2006.08.005

Cited by 19 publications

(15 citation statements)

References 28 publications

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“…SIMION simulations are based on the finite difference approach whose accuracy relating to HDAs has been investigated in a previous publication 16 based on the 2005 SIMION 7.0 version. Here, we use the latest 2012 SIMION 8.1 version 6 that has been substantially improved in speed, accuracy, and programming capabilities through the use of many new features such as "surface enhancement" to improve the modeling of curved electrodes, menu driven definitions of initial electron conditions, as well as taking advantage of multi-core, 64bit PC technology and larger RAM availability.…”

Section: B Simion Simulationsmentioning

confidence: 99%

Experimental energy resolution of a paracentric hemispherical deflector analyzer for different entry positions and bias

Doğan

Ulu

Gennarakis

et al. 2013

Review of Scientific Instruments

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A specially designed hemispherical deflector analyzer (HDA) with 5-element input lens having a movable entry position R0 suitable for electron energy analysis in atomic collisions was constructed and tested. The energy resolution of the HDA was experimentally determined for three different entry positions R0 = 84, 100, 112 mm as a function of the nominal entry potential V(R0) under pre-retardation conditions. The resolution for the (conventional) entry at the mean radius R0 = 100 mm was found to be a factor of 1.6-2 times worse than the resolution for the two (paracentric) positions R0 = 84 and 112 mm at particular values of V(R0). These results provide the first experimental verification and a proof of principle of the utility of such a paracentric HDA, while demonstrating its advantages over the conventional HDA: greater dispersion with reduced angular aberrations resulting in better energy resolution without the use of any additional fringing field correction electrodes. Supporting simulations of the entire lens plus HDA spectrometer are also provided and mostly found to be within 20%-30% of experimental values. The paracentric HDA is expected to provide a lower cost and∕or more compact alternative to the conventional HDA particularly useful in modern applications utilizing a position sensitive detector.

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Section: B Simion Simulationsmentioning

confidence: 99%

Experimental energy resolution of a paracentric hemispherical deflector analyzer for different entry positions and bias

Doğan

Ulu

Gennarakis

et al. 2013

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…), and the voltages of the electrodes. The accuracy of SIMION 7 has been discussed in the past [50] (SIMION 8.1 is much improved) and also been compared to the more accurate BEM approach [33].…”

Section: Calculation Methodsmentioning

confidence: 99%

Position, Energy, and Transit Time Distributions in a Hemispherical Deflector Analyzer with Position Sensitive Detector

Sise

Zouros

2015

Journal of Spectroscopy

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Practical analytic equations, for the ideal field, and numerical results from SIMION simulations, for the fringing field, are presented for the exit radiusrπand transit timetπof electrons in a hemispherical deflector analyzer (HDA) over a wide range of analyzer parameters. Results are presented for a typically dimensioned HDA with mean radiusR-=101.6 mm and interradial separationΔR=R2-R1=58.4 mm able to accommodate a 40 mm diameter position sensitive detector (PSD). Results for three different entry positionsR0are compared:R0=R-(the conventional central entry) and two displaced (paracentric) entries:R0=82.55 mm andR0=116 mm. Exit spreadsΔrπ,Δtπand base energy resolutionΔEBare computed for HDA pass energiesE0=10, 100, 500, and 1000 eV, entry aperture sizesΔr0≤1.5 mm, entry angular spreads|αmax|≤5°, and an electron beam with relative energy spreadδE/E0≤0.4%. Overall, under realistic conditions,bothparacentric entries demonstratenear idealfield behavior and clear superiority over the conventional entry atR0=R-. TheR0=82.55 mm entry has betterabsoluteenergy and time spread resolutions, while theR0=116 mm has betterrelativeenergy resolutions, both offering attractive alternatives for time-of-flight and coincidence applications where both energy and timing resolutions are important.

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“…A grid unit of 0.1 mm is used for geometry construction, and it gives an error of less than 1% on the trajectory [38], and the calculation takes a relatively short computation time. Finally, the simulation and the optimization of the lens were made with electrons.…”

Section: Computational Detailsmentioning

confidence: 99%

Electrostatic afocal-zoom lens design using computer optimization technique

Sise¹

2014

Journal of Electron Spectroscopy and Related Phenomena

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Investigation of the accuracy of ion optics simulations using Kepler orbits in a spherical capacitor

Cited by 19 publications

References 28 publications

Experimental energy resolution of a paracentric hemispherical deflector analyzer for different entry positions and bias

Experimental energy resolution of a paracentric hemispherical deflector analyzer for different entry positions and bias

Position, Energy, and Transit Time Distributions in a Hemispherical Deflector Analyzer with Position Sensitive Detector

Electrostatic afocal-zoom lens design using computer optimization technique

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