TY - CPAPER
AU - Chubar, O.V.
AU - Geloni, G.
AU - Kocharyan, V.
AU - Madsen, A.
AU - Saldin, E.
AU - Serkez, S.
AU - Shvyd'ko, Yu.
AU - Sutter, J.
TI - Novel Opportunities for Sub-meV Inelastic X-Ray Scattering Experiments at High-Repetition Rate Self-seeded XFELs
J2 - Proc. of FEL2015
AB - Inelastic x-ray scattering (IXS) is an important tool for studies of equilibrium dynamics in condensed matter. A new spectrometer recently proposed for ultra-high-resolution IXS (UHRIX) has achieved 0.6 meV and 0.25/nm spectral and momentum Transfer resolutions, respectively*. However, further improvements down to 0.1 meV and 0.02/nm are required to close the gap in energy-momentum space between high and low frequency probes. We Show that this goal can be achieved by further improvements in x-ray optics and by increasing the spectral flux of the incident x-ray pulses. UHRIX performs best at energies from 5 to 10 keV, where a combination of self-seeding and undulator tapering at the SASE2 beamline of the European XFEL promises up to a hundred-fold increase in average spectral flux compared to nominal SASE pulses at saturation, or three orders of magnitude more than possible with storage-ring based radiation sources. Wave-optics propagation shows that about 7·10¹² ph/s in a 90-microeV bandwidth can be achieved on the sample. This will provide unique new possibilities for IXS. Extended information about our work can be found in**.
PB - JACoW
CY - Geneva, Switzerland
SP - 257
EP - 262
KW - undulator
KW - radiation
KW - photon
KW - optics
KW - scattering
DA - 2015/12
PY - 2015
SN - 978-3-95450-134-2
DO - 10.18429/JACoW-FEL2015-MOP086
UR - http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop086.pdf
ER -