Physics Of Schottky Electron Sources: Theory And Optimum Operation by Merijntje BronsgeestPhysics Of Schottky Electron Sources: Theory And Optimum Operation by Merijntje Bronsgeest

Physics Of Schottky Electron Sources: Theory And Optimum Operation

byMerijntje BronsgeestEditorMerijntje Bronsgeest

Hardcover | July 25, 2014

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The Schottky electron emitter is a predominant electron-emitting source in today's electron beam equipment. This book comprehensively covers the Schottky emitter, dealing with its theoretical as well as practical aspects. The main questions that are addressed in this book are: what is the Schottky electron emitter? How does it work? And how do its properties affect the performance of electron beam equipment?

The focus is on the direct link between the operating conditions of the source and the properties of the beam at the target level. This coupling is made clear by discussing the effect of the operating conditions and the geometry of the source and gun on the emission properties of the emitting surface, the effect of Coulomb interactions on the brightness and energy spread in the first few millimeters of the beam path, and the effect of the operating conditions and the shape of the emitter on the consequences of the beam at the target. The final chapter combines all these effects to demonstrate that there is a trade-off to be made between brightness, energy spread, and shape stability.

Merijn Bronsgeestobtained her M.Sc. cum laude in 2004 at the Materials Science & Engineering department at Delft University of Technology, the Netherlands, being honored with the award for Best MS&E Graduate of the Year. She earned her Ph.D. in applied physics cum laude from the same university in 2009 for her work on Schottky electron...
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Title:Physics Of Schottky Electron Sources: Theory And Optimum OperationFormat:HardcoverDimensions:266 pages, 9.02 × 5.98 × 0.98 inPublished:July 25, 2014Publisher:Taylor and FrancisLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:9814364797

ISBN - 13:9789814364799

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Table of Contents

Introduction
Electron emission from a surface
The potential energy barrier at a surface
Emission by heating
The effect of an electric field on the potential energy barrier at a surface
Emission by heating and applying an electric field

Emission from a Schottky emitter

Work function variations across the emitter surface
Applying a bias
Applying a heating current
Total emission current

Emission from the end facet
The facet-extractor lens
The effect of the voltage settings
The effect of the emitter geometry
Schottky plots
The effect of the heating current

The final beam for applications
Imaged by the electron-optical system: the virtual source
Current in the source image: practical brightness
Total probe size: source image plus diffraction plus aberration contributions
The effect of electron-electron interactions in the beam
Summarizing: the beam properties relevant to electron optical systems

Geometrical stability
Observed geometrical changes
Equilibrium crystal shapes
Tip size growth
Changes of the end facet geometry
Collapsing of the end facet
The effect on the beam properties
Concluding remarks

Optimum operation
Maximum performance for different applications
Source monitoring tools
Practical considerations

Appendix A. Procedures for monitoring in a few commercial systems
Appendix B. Procedure to characterize system performance
References
Summary
Samenvatting
Acknowledgements
Curriculum Vitae