Abstract
Laser Plasma Accelerators (LPA) can sustain GeV/m accelerating fields offering outstanding new possibilities for compact applications. Despite the impressive recent developments, the LPA beam quality is still significantly lower than in the conventional radio-frequency accelerators, which is an issue in the cases of demanding applications such as Free Electron Lasers (FELs). If the electron beam duration is below few tens of femtosecond keeping pC charges, the mrad level divergence and few percent energy spread are particularly limiting. Several concepts of transfer line were proposed to mitigate those intrinsic properties targetting undulator radiation applications. We study here the robustness of the chromatic matching strategy for FEL amplification at 200~nm in a dedicated transport line, and analyze its sensitivity to several parameters. We consider not only the possible LPA source jitters, but also various realistic defaults of the equipment such as magnetic elements misalignements or focussing strength errors, unperfect undulator fields, etc...
Highlights
Free electron lasers (FEL) provide powerful, tuneable and short pulses in the x-ray spectral range [1,2,3,4,5,6,7,8]
This paper presents a detailed study of an Laser plasma accelerators (LPA) based FEL at 200 nm
With typical sate-of-the-art LPA beam parameters, FEL amplification cannot be achieved unless a transfer line is used to manipulate this beam and mitigate its initial large energy spread and divergence
Summary
Free electron lasers (FEL) provide powerful, tuneable and short pulses in the x-ray spectral range [1,2,3,4,5,6,7,8]. The higher the electronic density, undulator length and resonant wavelength, the higher is the gain It falls for lower electron beam energies. More recently it was proposed to take advantage of the longitudinal energy sorting introduced by the chicane to synchronize the focussing of the electron bunch slices with the advance of the radiation pulse. In this so-called chromatic matching regime [38], the effective gain can be significantly increased. Following the LPA, a first set of strong permanent magnet quadrupoles enables to refocus the highly divergent electron beam in order to minimize further chromatic effects in the transport line.
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