Coherent x rays with tunable time-dependent polarization

We describe a method for producing high power, coherent x-ray pulses from a free electron laser with femtosecond scale periodic temporal modulation of the polarization vector. This approach relies on the generation of a temporal intensity modulation after self seeding either by modulating the seed i...

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Bibliographic Details
Published in:Physical review. Accelerators and beams 2020-12, Vol.23 (12), p.120701, Article 120701
Main Authors: Sudar, N., Coffee, R., Hemsing, E.
Format: Article
Language:English
Subjects:
Afterburners
Coherent light
Electron beams
Free electron lasers
Light sources
Modulation
PARTICLE ACCELERATORS
Polarization
Production methods
synchrotron radiation & free-electron lasers
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Summary:We describe a method for producing high power, coherent x-ray pulses from a free electron laser with femtosecond scale periodic temporal modulation of the polarization vector. This approach relies on the generation of a temporal intensity modulation after self seeding either by modulating the seed intensity or the beam current. After generating a coherent temporally modulateds-polarization pulse, the electron beam is delayed by half a modulation period and sent into a short orthogonally oriented undulator, serving as ap-polarization afterburner. We provide simulations of three configurations for realizing this polarization switching, namely, enhanced self seeding with an intensity modulation generated by 2 color self seeding, enhanced self seeding of a current modulated bunch, and regular self seeding of a current modulated bunch. Start to end simulations for the Linac Coherent Light Source-II are provided for the latter.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.23.120701