Abstract
We present a setup based on the optical klystron concept, consisting of two undulator modules separated by a magnetic chicane, that addresses two issues in free-electron-laser (FEL) facilities. On the one hand, it allows increasing the intrinsic energy spread of the beam at the source, which is useful to counteract the harmful microbunching instability. This represents an alternative method to the more conventional laser heater with the main advantage that no laser system is required. On the other hand, the setup can be used to reconstruct the initial beam energy spread, whose typical values in FEL injectors around 1 keV are very difficult to measure with standard procedures.
Highlights
Free-electron lasers (FELs) are cutting-edge research tools in multiple scientific fields that allow the observation of matter with ultra-high spatial and time resolutions
We present a setup based on the optical klystron concept, consisting of two undulator modules separated by a magnetic chicane, that addresses two issues in free-electron-laser (FEL) facilities
In this article we propose a setup based on the optical klystron effect [6,7,8,9,10], consisting of two undulator modules and a magnetic chicane in between, as shown in Fig. 1, to increase and measure the intrinsic or uncorrelated energy spread of the electron beam
Summary
Free-electron lasers (FELs) are cutting-edge research tools in multiple scientific fields that allow the observation of matter with ultra-high spatial and time resolutions. In this article we propose a setup based on the optical klystron effect [6,7,8,9,10], consisting of two undulator modules and a magnetic chicane in between, as shown, to increase and measure the intrinsic or uncorrelated energy spread of the electron beam. Alternative schemes to increase the beam energy spread without the use of a laser have been presented: using a superconducting undulator to induce quantum fluctuations [22], based on transverse-deflector rf structures [23], introducing longitudinal phase mixing to the electron beam in a magnetic chicane [24], and employing transversegradient undulators [25]. III we demonstrate the validity of our scheme with numerical simulations performed with the FEL code Genesis 1.3 [28] for parameters based on the SwissFEL design
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