XLSWP 3 Gun and Injector Meeting Xband Gun

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XLS-WP 3 Gun and Injector Meeting X-band Gun RF design Group of accelerator physics,

XLS-WP 3 Gun and Injector Meeting X-band Gun RF design Group of accelerator physics, Instituto de Física Corpuscular (IFIC), Valencia, Spain D. Esperante, D. González-Iglesias, B. Gimeno, C. Blanch, M. Boronat, J. Fuster, A. Vnuchenko 1 th June 2018

Summary Ø Since our group has no previous experience in the design of RF

Summary Ø Since our group has no previous experience in the design of RF electron guns, until now the tasks carried out have been aimed to get a solid background in this subject. Ø We have contacted and visited the group of the Prof. Massimo Ferrario at the INFN in Frascati, to get support and advice about the planning of the project tasks. Ø An exhaustive bibliographic research (books, articles) in RF photoinjector design theory has been performed. This task is still in progress. Some of the bibliography revisited: • T. P. Wangler, “RF Linear Accelerators”, ed. Wiley-VCH, 2 nd edition, 2008. • T. Rao, D. H. Dowell, “An Engineering guide to photoinjectors”, 2013. • M. Reiser, “Theory and design of Charged Particle Beams”, ed. Wiley-VCH, 2 nd edition, 2008. • D. Alesini, “Power Coupling”, CAS - CERN Accelerator School: Specialised Course on RF for Accelerators; 8 - 17 Jun 2010, Ebeltoft, Denmark. • D. Alesini et al. , “New technology based on clamping for high gradient radio frequency photogun”, Physical Review Special Topics, Accelerators and Beams 18, 092001 (2015). • L. Faillace, “Innovative Radio-Frequency Linear Accelerating Structures”, Ph. D Thesis, University La Sapienza, 2008. • F. B. Kiewiet, “Generation of ultra-short, high brightness relativistic electron bunches”, Ph. D Thesis, University of Eindhoven, 2003. 2

Summary Ø Recently, we have started to use Electromagnetic Codes (2 D: SUPERFISH, 3

Summary Ø Recently, we have started to use Electromagnetic Codes (2 D: SUPERFISH, 3 D: HFSS) to analyse some simple RF structures which are the basis of the RF photoinjector. 1. 2. Analysis of a Pillbox Cavity with TM 010 mode with SUPERFISH: f (MHz) U (J) P (W) Q Z (M /m) T ( =0. 994) Analytical SUPERFISH 3000 2999. 998 2. 73984 e-4 2. 73923 e-4 219. 0514 219. 005 23576. 2 228. 098 228. 147 0. 63276 ZT 2 (M /m ) 91. 330 91. 349 Analysis of two coupled pillboxes cavities with TM 010 mode with SUPERFISH: Pillbox cavity Two coupled pillboxes “ 0 -mode” “ -mode” 3

Summary Ø We have also contacted with the group of Prof. J. Zapata at

Summary Ø We have also contacted with the group of Prof. J. Zapata at the Polytechnical University of Madrid, which are experts in the analysis of RF structures by means of computational methods based on the Finite Element Method. Ø They have developed in-house a 3 D Electromagnetic Code which is able to analyse RF structures, in particular RF photoinjectors. References: • J. M. Gil, J. Monge, J. Rubio, J. Zapata, “A CAD-Oriented Method to Analyze and Design Radiating Structures Based on Bodies of Revolution by Using Finite Elements and Generalized Scattering Matrix”, IEEE Transactions on Antennas and Propagation, vol. 54, no. 3, March 2006. • J. Martínez-Fernández, J. M. Gil, J. Zapata, “Ultrawideband Optimized Profile Monopole Antenna by Means of Simulated Annealing Algorithm and the Finite Element Method”, vol. 55, no. 6, June 2007. 4

Summary Ø We have sent them the scheme of a realistic RF gun in

Summary Ø We have sent them the scheme of a realistic RF gun in order to get it analysed with their code. Scheme of 21/2 RF gun. Extracted from: J. Rodier et al. , “Construction of the Alpha-X Photoinjector Cavity”, Proceedings of EPAC 2006, Edinburgh, Scotland. 5

Summary Ø In the past days, we have contacted with Prof. Avni Aksoy from

Summary Ø In the past days, we have contacted with Prof. Avni Aksoy from the University of Ankara, who has provided us the SUPERFISH files for an X-band 5. 6 Cell RF gun Scheme of the 5. 6 RF gun Electric field along the axis of the RF gun Ø We are studying this design in order to get a better understanding of realistic photinjector structures and how to analyse them using SUPERFISH. 6

Thanks for your attention

Thanks for your attention