TY - CPAPER
AU - Kocharyan, V.
AU - Geloni, G.
AU - Saldin, E.
TI - Scheme to Increase the Output Average Spectral Flux of the European XFEL at 14.4 keV
J2 - Proc. of FEL2015
AB - Inelastic X-ray scattering and nuclear resonance scattering are limited by the photon flux available at SR sources, up to 10¹⁰ ph/s/meV at 14.4 keV. A thousand-fold increase may be obtained by exploiting high repetition rate self-seeded pulses at the European XFEL. We report on a feasibility study for an optimized configuration of the SASE2 beamline combining self-seeding and undulator tapering at 14.4 keV. One should perform monochromatization at 7.2 keV by self-seeding, and amplify the seed in the first part of the output undulator. Before saturation, the electron beam is considerably bunched at the 2nd harmonic. A second part of the output undulator tuned to 14.4 keV can thus be used to obtain saturation at this energy. One can further prolong the exchange of energy between the photon and the electron beam by tapering the last part of the output undulator. Start-to-end simulations demonstrate that self-seeding, combined with undulator tapering, allows one to achieve more than a hundred-fold increase in average spectral flux compared with the nominal SASE regime at saturation, resulting in a spectral flux of order 10¹³ ph/s/meV. A more detailed description of this study can be found in*.
PB - JACoW
CY - Geneva, Switzerland
SP - 251
EP - 256
KW - FEL
KW - undulator
KW - electron
KW - photon
KW - scattering
DA - 2015/12
PY - 2015
SN - 978-3-95450-134-2
DO - 10.18429/JACoW-FEL2015-MOP085
UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop085.pdf
ER -