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@unpublished{xu:sap2023-tuya01,
% --- JACoW template Dec 2024 ---
author = {X. Xu},
title = {{Attosecond X-ray free-electron lasers utilizing an optical undulator in a self-selection regime}},
eventtitle = {14th Symp. Accel. Phys. (SAP'23)},
eventdate = {2023-07-10/2023-07-12},
language = {english},
intype = {presented at},
series = {Symposium on Accelerator Physics},
number = {14},
venue = {Xichang, China},
note = {presented at the 14th Symp. Accel. Phys. (SAP'23) in Xichang, China, unpublished},
abstract = {{Accelerator-based X-ray free-electron lasers (XFELs) are the latest addition to the revolutionary tools of discovery for the 21st century. The two major components of an XFEL are an accelerator-produced electron beam and a magnetic undulator which tend to be kilometer-scale long and expensive. Here, we present an ultra-compact scheme to produce 10s of attosecond X-ray pulses with several GW peak power utilizing a novel aspect of the FEL instability using a highly chirped, pre-bunched and ultra-bright electron beam from a plasma-based accelerator interacting with an optical undulator. The self-selection of electrons from the combination of a highly chirped and pre-bunched beam leads to the stable generation of attosecond X-ray pulses. Furthermore, two-color attosecond pulses with sub-femtosecond separation can be produced by adjusting the energy distribution of the electron beam so that multiple FEL resonances occur at different locations within the beam. Such a tunable coherent attosecond X-ray sources may open up a new area of attosecond science enabled by X-ray attosecond pump/probe techniques.}},
}