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Quasi-half-cycle pulses of light from a tapered undulator
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA.
2017 (English)In: PHYSICAL REVIEW ACCELERATORS AND BEAMS, ISSN 2469-9888, Vol. 20, no 8, article id 080703Article in journal (Refereed) Published
Abstract [en]

Strong-field few-cycle terahertz (THz) pulses are an invaluable tool for engineering highly non-equilibrium states of matter. A scheme is proposed to generate quasi-half-cycle GV/m-scale THz pulses with a multikilohertz repetition rate. It makes use of coherent spontaneous emission from a prebunched electron beam traversing an optimally tapered undulator. The scheme is the further development of the slippage control in free-electron lasers [T. Tanaka, Phys. Rev. Lett. 114, 044801 (2015)]. An explicit condition for the spectral amplitude of undulator radiation and a phase condition for the electron density distribution, required for the generation of desired pulses, are presented. The amplitude condition is met by proper undulator tapering, and a generic optimal undulator profile is found analytically. In order to meet the phase condition, the distance between the adjacent bunches is varied according to the instantaneous resonant undulator wavelength. A 3D analytical theory is complemented by a detailed numerical study based on a direct solution to the 3D wave equation.

Place, publisher, year, edition, pages
2017. Vol. 20, no 8, article id 080703
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-332656DOI: 10.1103/PhysRevAccelBeams.20.080703ISI: 000407559200001OAI: oai:DiVA.org:uu-332656DiVA, id: diva2:1156584
Funder
Swedish Research CouncilAvailable from: 2017-11-13 Created: 2017-11-13 Last updated: 2017-11-13Bibliographically approved

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