Scheme for simultaneous generation of three-color ten GW-level X-ray pulses from baseline XFEL undulator and multi-user distribution system for XFEL laboratory
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Abstract
The baseline design of present XFEL projects only considers the production of a single
photon beam at fixed wavelength from each baseline undulator. At variance, the scheme
described in this paper considers the simultaneous production of high intensity SASE
FEL radiation at three different wavelengths. We present a feasibility study of our
scheme, and we make exemplifications with parameters of the baseline SASE2 line of
the European XFEL operating in simultaneous mode at 0.05 nm, 0.15 nm and 0.4 nm. Our
technique for generating the two colors at 0.05 nm and 0.15 nm is based in essence
on a "fresh bunch" technique. For the generation of radiation at 0.4 nm we propose
to use an "afterburner" technique. Implementation of these techniques does not perturb
the baseline mode of operation of the SASE2 undulator. The present paper also describes
an efficient way to obtain a multi-user facility. It is shown that, although the XFEL
photon beam from a given undulator is meant for a single user, movable multilayer
X-ray mirrors can be used to serve many users simultaneously. The proposed photon
beam distribution system would allow to switch the FEL beam quickly between many experiments
in order to make an efficient use of the source. Distribution of photons is achieved
on the basis of pulse trains and it is possible to distribute the multicolor photon
beam among many independent beam lines, thereby enabling many users to work in parallel
with different wavelengths.