Abstract
High-gain free-electron lasers (FELs) are driven by short, high-charge density electron beams as only produced at dedicated single pass or recirculating linear accelerators. We describe new conceptual, technical, and modeling solutions to produce subpicosecond, up to $\ensuremath{\sim}100\text{ }\text{ }\ensuremath{\mu}\mathrm{J}$-energy extreme ultra-violet and soft x-ray FEL pulses at high- and tunable repetition rates, from diffraction-limited storage ring light source. In contrast to previously proposed schemes, we show that lasing can be simultaneous to the standard multibunch radiation emission from short insertion devices, and that it can be obtained with limited impact on the storage ring infrastructure. By virtue of the high-average power but moderate pulse energy, the storage ring-driven high-gain FEL would open the door to unprecedented accuracy in time-resolved spectroscopic analysis of matter in the linear response regime, in addition to inelastic scattering experiments.
Highlights
Storage ring light sources (SRLS) are advanced tools for the investigation of matter down to the molecular spatial and timescale. To cope with their limitation in serving simultaneously high brilliance, coherent diffraction, and timing experiments, several SRLS laboratories are being enlarging their infrastructure with a short wavelength, sub-ps, high-gain free-electron laser (FEL) [1,2,3,4,5]
The construction and operational cost of a multiGeV linacdriven FEL poses the question of whether a high-gain (HG) FEL can be driven by an existing SRLS while not interfering with, and complementing the standard multibeamline operation from short insertion devices (IDs)
This is made of a short linac run at the zero-crossing phase to impart a linearly correlated energy spread to the beam
Summary
Storage ring light sources (SRLS) are advanced tools for the investigation of matter down to the molecular spatial and timescale. Three major showstoppers have so far excluded high-gain lasing from the portfolio of SRLS: (i) 100’s A bunch peak current to drive the lasing process, (ii) transparency to the standard multibunch operation, and (iii) modeling of the light source over an arbitrary timescale The former two subjects have been tackled in the literature with schemes which at best severely limit the number of stored bunches, reduce the average. The predicted performance result suited for the study of magnetic and electronic structures, as well as sub-ps fine analysis in spectroscopy This technique is better served by higher repetition rates than provided by normal conducting linacs, but at photon pulse energies 2–4 orders of magnitude lower than those currently available at singlepass x-ray FELs [26].
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