Abstract
Thermionic RF guns are used as highly brilliant electron source for linac-driven FEL (free electron laser). They can potentially produce an electron beam with high energy, small emittance, short pulse duration, inexpensive and compact configuration in comparison with other high brightness electron sources, e.g., DC guns and photocathode RF guns. The most critical issue of the thermionic RF gun is the transient cathode heating problem due to the electron back-bombardment when the gun is used for an FEL driver. The heating property of cathode strongly depends on the physical properties of the cathode material such as electron stopping power and range. We investigated the heating property of six hexaboride materials against the back-bombarding electrons by numerical calculation of the stopping power and range. In this investigation, the emission property of the cathode was also taken into account, since high electron emission is required for generation of high brightness electron beam. As a result, calcium hexaboride material has best properties for thermionic RF gun cathode material in the backbombardment effect point of view.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Yamazaki T et al (2002) Free Electron Laser 2001:II13–II14.
Kii T, Nakai Y, Fukui T, Zen H, Kusukame K, Okawachi N, Nakano M, Masuda K, Ohgaki H, Yoshikawa K, Yamazaki T (2007) AIP Conf Proc 879:248–251
Masuda K, Kusukame K, Kii T, Ohgaki H, Zen H, Fukui T, Nakai Y, Yoshikawa K, Yamazaki T (2005) Particle simulations of a thermionic RF gun with gridded triode structure for reduction of backbombardment. In: Proceedings of the 27th International Free Electron Laser Conference, pp 588–591
Zen H (2009) Doctor Thesis, Institute of Advanced Energy, Kyoto University
Lafferty JM (1951) Boride cathodes. J Appl Phys 22(3):299–309
Lundström T (1985) Pure Appl Chem 57(10):1383–1390
Kobayashi H (1992) Emittance measurement for high-brightness electron guns. In: 1992 Linear Accelerator Conference, Ottawa, Canada
Tabata T, Ito R, Okaba S (1972) Generalized semiempirical equations for the extrapolated range of electrons. Nuclear Instrum Methods 103:85–91
http://www.emsdiasum.com/microscopy/products/microscope/lab6_ceb6.aspx?mm=8
Acknowledgment
The author wish to thank the GCOE program, (Energy Science in the Age of Global Warming) Kyoto University, for financial support.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Springer
About this paper
Cite this paper
Bakr, M. et al. (2010). Comparison Between the Hexaboride Materials as Thermionic Cathode in the RF Guns for a Compact MIR-FEL Driver. In: Yao, T. (eds) Zero-Carbon Energy Kyoto 2009. Green Energy and Technology. Springer, Tokyo. https://doi.org/10.1007/978-4-431-99779-5_32
Download citation
DOI: https://doi.org/10.1007/978-4-431-99779-5_32
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-99778-8
Online ISBN: 978-4-431-99779-5
eBook Packages: EngineeringEngineering (R0)