Abstract
We describe the experimental observation of highly nonlinear energy striations generated by two lasers in a relativistic electron beam in an echo-enabled harmonic generation (EEHG) setup. The rich energy banding structure results from strong dispersion of the sinusoidally modulated beam, and measurements of the banding spectrum enable benchmarking, optimization, and characterization of the concomitant EEHG process. Results are found to be in good agreement with theory, and suggest that the presented technique can facilitate the practical implementation of EEHG to generate intense, fully coherent light in future advanced accelerator-based light sources.
Highlights
Echo-enabled harmonic generation (EEHG) is a proposed method for particle accelerator-based light sources to produce intense, fully coherent radiation at x-ray wavelengths [1,2]
In modern high-gain x-ray free electron lasers (FELs), the radiation typically starts from shot noise in the electron beam (e-beam), which results in limited temporal coherence and large statistical fluctuations in the output light
A challenging concern is the preservation of the highly nonlinear energy striations generated in the e-beam longitudinal phase space, which may be degraded by intrabeam scattering (IBS), incoherent synchrotron radiation (ISR), and other transport effects [2,16,17]
Summary
Echo-enabled harmonic generation (EEHG) is a proposed method for particle accelerator-based light sources to produce intense, fully coherent radiation at x-ray wavelengths [1,2]. In EEHG, the beam is again modulated by a second laser at frequency k2 1⁄4 2π=λ2, and dispersed in a weaker chicane [Fig. 1(C)] to convert the fine-scale energy striations into a high-harmonic density modulation [Fig. 1(D)] at the frequency ak1, where a ≫ 1 is the harmonic factor.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
