Abstract
Theoretical research and simulation of the suppression of the lowest harmonics of free-electron laser radiation (FEL) with a two-frequency undulator was carried out. A phenomenological model of an FEL that describes the evolution of power in an FEL considering all the main losses was used. Radiation of harmonics in an FEL with a two-frequency flat undulator is compared with the radiation of harmonics in an FEL with an ordinary flat undulator. Radiation of harmonics and the FEL-induced energy spread in a single-pass FEL, where harmonics that are lower with respect to the nth harmonic are suppressed, for example, by a shift of the electron phase relative to photons by kπ/n, k = even, between the undulator walls were investigated. The advantages of using a two-frequency undulator in an FEL with suppressed lowest harmonics and the possibility of generating high-power X-ray radiation of higher harmonics in a linear mode are illustrated. The power of the higher harmonics can exceed the pitch power of an ordinary FEL with a flat undulator.
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17 March 2020
The authors apologize for the misprints in the article “Improved Generation of Higher Harmonics and Suppression of the Lowest Harmonics in an X-Ray FEL with a Two-Frequency Undulator” by K. Zhukovsky in <Emphasis Type="Italic">Moscow University Physics Bulletin, 2018, Vol. 73, No. 5, pp. 462–469</Emphasis>, DOI: <ExternalRef><RefSource>https://doi.org/10.3103/S0027134918050193</RefSource><RefTarget Address="10.3103/S0027134918050193" TargetType="DOI"/></ExternalRef>, and communicate the following corrected formula (5) for the Bessel coefficients <Emphasis Type="Italic">f</Emphasis><Subscript><Emphasis Type="Italic">n</Emphasis></Subscript> of the two-frequency undulator:
06 August 2019
We hereby clarify the following correct mathematical formof <Emphasis Type="Bold">formula (5) and formulas in the text above</Emphasis> it for the Bessel coefficients of a dual-frequency undulator:
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ACKNOWLEDGMENTS
We thank Professor A.V. Borisov, Professor V.Ch. Zhukovskii, Professor A. N. Vasil’ev, and Leading Researcher A.E. Lobanov for useful discussions.
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Translated by I. P. Obrezanova
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Zhukovsky, K.V. Improved Generation of Higher Harmonics and Suppression of the Lowest Harmonics in an X-Ray FEL with a Two-Frequency Undulator. Moscow Univ. Phys. 73, 462–469 (2018). https://doi.org/10.3103/S0027134918050193
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DOI: https://doi.org/10.3103/S0027134918050193