Physics design of a dual-ring light source toward MHz-rate free-electron laser radiation
Abstract
Combining the high peak brilliance and short pulse duration of free-electron lasers (FELs) with the high repetition rate of diffraction-limited storage rings (DLSRs) is a promising direction for accelerator light sources. In this paper, we propose a dual-ring light source concept that, at MHz repetition rates, delivers pulses with a pulse durations and peak power intermediate between those of FELs and DLSRs. Such a light source can be realized as an upgrade of an existing DLSR by adding an isochronous ring equipped with transverse gradient undulators (TGUs) and connecting the two rings via bunch compression and decompression systems. We present the conceptual layout and show that bunch compression shortens the electron bunches to ps-scale durations; multi-turn radiation in the isochronous ring raises the repetition rate to 1.36 MHz from a single TGU; and the long TGUs enhance the brilliance, delivering 107--109 photons per pulse across the soft and hard X-ray range, an increase of 2--4 orders of magnitude over the original DLSR. The dual-ring light source thus provides a cost-effective route to MHz FEL operation based on existing storage-ring infrastructure, combining the high repetition rate of a DLSR with the short pulses and high brilliance of a linac-driven FEL.
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BibTeX
@misc{zeng2026physics,
title = {{Physics design of a dual-ring light source toward MHz-rate free-electron laser radiation}},
author = {Fancong Zeng and Yi Jiao and Weihang Liu and Yu Zhao and Weilun Qin},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.12397},
eprint = {2611.12397},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.12397},
}
RIS
TY - UNPB
TI - Physics design of a dual-ring light source toward MHz-rate free-electron laser radiation
AU - Fancong Zeng
AU - Yi Jiao
AU - Weihang Liu
AU - Yu Zhao
AU - Weilun Qin
PY - 2026
DA - 2026/11/09
PB - arXiv
DO - 10.48550/arxiv.2611.12397
UR - https://arxiv.org/abs/2611.12397
AB - Combining the high peak brilliance and short pulse duration of free-electron lasers (FELs) with the high repetition rate of diffraction-limited storage rings (DLSRs) is a promising direction for accelerator light sources. In this paper, we propose a dual-ring light source concept that, at MHz repetition rates, delivers pulses with a pulse durations and peak power intermediate between those of FELs and DLSRs. Such a light source can be realized as an upgrade of an existing DLSR by adding an isochronous ring equipped with transverse gradient undulators (TGUs) and connecting the two rings via bunch compression and decompression systems. We present the conceptual layout and show that bunch compression shortens the electron bunches to ps-scale durations; multi-turn radiation in the isochronous ring raises the repetition rate to 1.36 MHz from a single TGU; and the long TGUs enhance the brilliance, delivering 10^7--10^9 photons per pulse across the soft and hard X-ray range, an increase of 2--4 orders of magnitude over the original DLSR. The dual-ring light source thus provides a cost-effective route to MHz FEL operation based on existing storage-ring infrastructure, combining the high repetition rate of a DLSR with the short pulses and high brilliance of a linac-driven FEL.
ER -