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Solar driven lasers for power satellite applications
The technological feasibility of using multimagawatt lasers for space power transmission is discussed. Candidate lasers include electric discharge lasers, direct optically pumped lasers, and free electron lasers
Automatic tuning of Free Electron Lasers
Existing FEL facilities often suffer from stability issues: so electron
orbit, transverse electron optics, electron bunch compression and other
parameters have to be readjusted often to account for drifts in performance of
various components. The tuning procedures typically employed in operation are
often manual and lengthy. We have been developing a combination of model-free
and model-based automatic tuning methods to meet the needs of present and
upcoming XFEL facilities. Our approach has been implemented at FLASH
\cite{flash} to achieve automatic SASE tuning using empirical control of orbit,
electron optics and bunch compression. In this paper we describe our approach
to empirical tuning, the software which implements it, and the results of using
it at FLASH. We also discuss the potential of using machine learning and
model-based techniques in tuning methods
Plasma boosted electron beams for driving Free Electron Lasers
In this paper, we report results of simulations, in the framework of both
EuPRAXIA \cite{Walk2017} and EuPRAXIA@SPARC\_LAB \cite{Ferr2017} projects,
aimed at delivering a high brightness electron bunch for driving a Free
Electron Laser (FEL) by employing a plasma post acceleration scheme. The
boosting plasma wave is driven by a tens of \SI{}{\tera\watt} class laser and
doubles the energy of an externally injected beam up to \GeV{1}. The injected
bunch is simulated starting from a photoinjector, matched to plasma, boosted
and finally matched to an undulator, where its ability to produce FEL radiation
is verified to yield O(\num{e11}) photons per shot at \nm{2.7}.Comment: 5 pages, 2 figure
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