TY - GEN
T1 - Superradiant and stimulated-superradiant emission of bunched electron beams
AU - Gover, A.
AU - Ianconescu, R.
AU - Friedman,
AU - Emma, C.
AU - Sudar, N.
AU - Musumeci, P.
AU - Pellegrini, C.
N1 - Publisher Copyright:
Content from this work may be used under the terms of the CC BY 3.0 licence (© 2019). Any distribution of this work must maintain attribution to the author(s).
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85086234626&partnerID=8YFLogxK
U2 - 10.18429/JACoW-FEL2019-TUT01
DO - 10.18429/JACoW-FEL2019-TUT01
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AN - SCOPUS:85086234626
T3 - Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019
SP - 288
EP - 289
BT - Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019
PB - JACoW Publishing
T2 - 39th International Free-Electron Laser Conference, FEL 2019
Y2 - 26 August 2019 through 30 August 2019
ER -