Bridging the gap of storage ring light sources and linac-driven free-electron lasers

Mitri, S. Di; Cornacchia, M.; Diviacco, B.; Perosa, Giovanni; Sottocorona, Filippo; Spampinati, S.

doi:10.1103/physrevaccelbeams.24.060702

Cited by 4 publications

(2 citation statements)

References 52 publications

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“…Compared to conventional high-gain harmonic generation (HGHG) 1 – 4 , the echo-enabled harmonic generation (EEHG) scheme is significantly less sensitive to energy spread, which is typically large in storage rings. Recently, to overcome such large energy spread, the use of transverse gradient undulators (TGUs) has been proposed for a high-gain short wavelength FEL driven by a diffraction-limited synchrotron light source 5 ; however, this approach requires bunches to be diverted into an additional ring with its own rf cavities. Since the EEHG seeding option requires no change of the storage ring lattice and is fully compatible with other beamlines, the compact design currently studied could enable synchrotron light source based free-electron lasers (FELs) to produce intense coherent radiation pulses with short durations 6 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Optimization of echo-enabled harmonic generation toward coherent EUV and soft X-ray free-electron laser at NSLS-II

Yang

Penn

et al. 2022

Sci Rep

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Prebunching via echo-enabled harmonic generation (EEHG) is an efficient way to reduce the radiator length and improve the longitudinal coherence as well as output stability in storage-ring-based free-electron lasers. We propose a conceptual design, which uses two straight sections to seed coherent extreme-ultraviolet (EUV) and soft X-ray emission with nearly MHz repetition rate. To take the large energy spread (10−3) of a storage ring into account and utilize the existing bending magnets between the two straight sections as the first chicane, we implement a special modeling tool, named EEHG optimizer. This tool has been successfully applied to maximize the prebunching with a reasonably low energy modulation, thereby generating intense coherent X-ray pulses within a short undulator length (a few meters) limited by the available space of a storage ring. Numerical simulations confirm that the optimized EEHG parameters can be directly applied to generate a 10 MW scale peak power with fully coherent ultrafast EUV to soft X-ray pulses based on the NSLS-II parameters. This method can be easily extended to other types of diffraction-limited storage rings.

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Section: Introductionmentioning

confidence: 99%

Optimization of echo-enabled harmonic generation toward coherent EUV and soft X-ray free-electron laser at NSLS-II

Yang

Penn

et al. 2022

Sci Rep

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“…Yet, the average power of the spontaneous EUV radiation from an electron storage ring is only several watts even with extremely high beam current and long undulators. Using micro-bunched electron beams is currently the most effective way to enhance the average power of accelerator-based light sources, since the output power is proportional to the square of the electron numbers in the micro-bunches 3 , 4 . For storage rings, the leading concept for realizing this kind of light source is the steady-state micro-bunching (SSMB) 5 – 7 scheme.…”

Section: Introductionmentioning

confidence: 99%

A synchrotron-based kilowatt-level radiation source for EUV lithography

Jiang

Feng

et al. 2022

Sci Rep

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A compact damping ring with a limited circumference of about 160 m is proposed for producing kilowatt-level coherent EUV radiation. The electron bunch in the storage ring is modulated by a 257 nm wavelength seed laser with the help of the angular-dispersion-induced micro-bunching method (Feng and Zhao in Sci Rep 7:4724, 2017), coherent radiation at 13.5 nm with an average power of about 2.5 kW can be achieved with the state-of-the-art accelerator and laser technologies.

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Sustainable early-stage lasing in a low-emittance electron storage ring

Zhou,

Li,

Bai

2023

Applied Physics Letters

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In this Letter, we report on the concept and analysis of a low-emittance electron storage ring, in which the electron beams undergo an early-stage self-amplified spontaneous emission lasing process on a turn-by-turn basis. The lasing process for each pass through a long undulator in the ring is terminated when the radiated power is still negligible compared to the total synchrotron loss of each circulation, and the electron beams can be maintained in an equilibrium state that supports sustainable lasing. A self-consistent model is derived for evaluation of the properties of the electron beams, and a design with numerical modeling is presented that demonstrates the feasibility of generating short wavelength radiation at the kW power level.

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Bridging the gap of storage ring light sources and linac-driven free-electron lasers

Cited by 4 publications

References 52 publications

Optimization of echo-enabled harmonic generation toward coherent EUV and soft X-ray free-electron laser at NSLS-II

Optimization of echo-enabled harmonic generation toward coherent EUV and soft X-ray free-electron laser at NSLS-II

A synchrotron-based kilowatt-level radiation source for EUV lithography

Sustainable early-stage lasing in a low-emittance electron storage ring

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