Abstract
A two-color free-electron laser pulse can be generated in a split undulator configuration, where a controllable quadrupole wakefield induces a time-dependent mismatch along the bunch.
Highlights
High-brightness, short-duration x-ray free-electron lasers (XFELs), such as the Linac Coherent Light Source (LCLS) [1], the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) [2], the European XFEL [3] and so on, open up a wide range of applications in probing both the ultrasmall scale and ultrafast processes
In this paper we present a feasible example following this concept based on the Linac Coherent Light Source parameters
Time-dependent mismatch along the bunch is generated by a passive dechirper module and controlled by downstream matching sections, enabling FEL lasing at different wavelength with a split undulator configuration
Summary
High-brightness, short-duration x-ray free-electron lasers (XFELs), such as the Linac Coherent Light Source (LCLS) [1], the SPring-8 Angstrom Compact Free-Electron Laser (SACLA) [2], the European XFEL [3] and so on, open up a wide range of applications in probing both the ultrasmall scale and ultrafast processes. Note there are studies concerning period tunable undulators [13,14], which can enrich the schemes to generate two-color FELs. Recently, a fresh-slice method generating multicolor, fully saturated x-ray pulses has been demonstrated at the LCLS [15]. A fresh-slice method generating multicolor, fully saturated x-ray pulses has been demonstrated at the LCLS [15] This method relies on an electron bunch tailored with time-dependent transverse kick effect introduced by passing the electron bunch offaxis in a dechirper device [16,17,18] before entering the undulator. When the electron bunch traverses the dechirper, temporal slices experience a time-dependent quadrupole effect, resulting in progressively mismatched slices from head to tail.
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