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Title | Superradiance and Stimulated-Superradiant Emission of Bunched Electron Beams | |
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Abstract | We outline the fundamental processes of coherent radiation emission from a bunched charged particles beam [1]. In contrast to spontaneous emission of radiation from a random electron beam that is proportional to the number of particles N, a pre-bunched electron beam emits spontaneously coherent radiation proportional to N² through the process of (spontaneous) superradiance (SP-SR) (in the sense of Dicke’s [2]). The SP-SR emission of a bunched electron beam can be even further enhanced by a process of stimulated-superradiance (ST-SR) in the presence of a seed injected radiation field. These coherent radiation emission processes are presented in term of a radiation mode expansion model, applied to general free electron radiation schemes: Optical-Klystron, HGHG, EEHG, and coherent THz sources based on synchrotron radiation, undulator radiation or Smith-Purcell radiation. The general model of coherent spontaneous emission is also extended to the nonlinear regime - Tapering Enhanced Stimulated Superradiance (TESSA) [3], and related to the tapered wiggler section of seed-injected FELs. In X-Ray FELs these processes are convoluted with other effects, but they are guidelines for strategies of wiggler tapering efficiency enhancement. | |
Footnotes & References | [1] A. Gover et al., Rev. Mod. Phys. https://arxiv.org/abs/1810.07566v3 (2019) [2] R. H. Dicke, Physical Review 93, 99 (1954) [3] N. Sudar et al., P.R.L. 117, 174801 (2016) |
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Funding | We acknowledge support of the Israel Science Foundation and the German Israeli Projects Foundation (DIP). | |
Paper | download TUT01.PDF [0.461 MB / 2 pages] | |
Slides | download TUT01_TALK.PDF [11.391 MB] | |
Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |
Conference | FEL2019 | |
Series | Free Electron Laser Conference (39th) | |
Location | Hamburg, Germany | |
Date | 26-30 August 2019 | |
Publisher | JACoW Publishing, Geneva, Switzerland | |
Editorial Board | Volker R.W. Schaa (GSI, Darmstadt, Germany); Winfried Decking (DESY, Hamburg, Germany); Harald Sinn (EuXFEL, Schenefeld, Germany); Gianluca Geloni (EuXFEL, Schenefeld, Germany); Siegfried Schreiber (DESY, Hamburg, Germany); Michaela Marx (DESY, Hamburg, Germany) | |
Online ISBN | 978-3-95450-210-3 | |
Online ISSN | "" | |
Received | 20 August 2019 | |
Accepted | 29 August 2019 | |
Issue Date | 05 November 2019 | |
DOI | doi:10.18429/JACoW-FEL2019-TUT01 | |
Pages | 288-289 | |
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