
Proceedings Paper
Status of the K-B bendable optics at FERMI@Elettra FELFormat | Member Price | Non-Member Price |
---|---|---|
$17.00 | $21.00 |
Paper Abstract
FERMI is the first seeded EUV-SXR free electron laser (FEL) user facility operated at Elettra Sincrotrone
Trieste. Two of the three already operating beamlines, namely LDM (Low DensityMatter) and DiProI (Diffraction
and Projection Imaging), use a Kirkpatrick-Baez (K-B) active X-ray optics system for focusing the FEL
pulses onto the target under investigation. The present work reports on the final results obtained from the
optimization of the K-B optical system at the DiProI endstation. The aim of the optimization is to improve the
system performances in terms of quality and size of the focal spot onto the sample, controlling the fluence as
well. To characterize the performances and develop reliable and reproducible focusing procedures we performed
a campaign of measurements with several diagnostic systems, including a wavefront sensor mounted after the
DiProI chamber. Online wavefront measurements have made possible the optimization of the bending acting
on the mirror curvature and of the (pitch and roll) angle positions of the K-B system. From the wavefront
measurements we have inferred a focal spot of 8 μm x 9.5 μm, confirmed by the PMMA ablation imprints. The
experimental results are compared with the predictions from simulations obtained using the WISE code, starting
from the characterization of the actual mirror surface metrology. The results from simulations are in agreement
with the experimental measurements. Filtering the Fourier transform of the mirror surface profiles, using the
WISE code we have analyzed the impact of different spatial wavelengths on the focal spot degradation. For
different energies of the incident beam we established the threshold where the focal spot degradation is no longer
affected by the spatial wavelengths of the K-B mirror surfaces.
In the very last period we were starting to observe a degradation of the focal spot. After a metrology analysis
we concluded that the problem was due to a failure of the substrate material. We temporally solved the problem
checking the mounting, but we have planned an improvement of the material for the future.
Paper Details
Date Published: 17 September 2014
PDF: 11 pages
Proc. SPIE 9208, Adaptive X-Ray Optics III, 920804 (17 September 2014); doi: 10.1117/12.2062326
Published in SPIE Proceedings Vol. 9208:
Adaptive X-Ray Optics III
Stephen L. O'Dell; Ali M. Khounsary, Editor(s)
PDF: 11 pages
Proc. SPIE 9208, Adaptive X-Ray Optics III, 920804 (17 September 2014); doi: 10.1117/12.2062326
Show Author Affiliations
L. Raimondi, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
C. Svetina, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Univ. degli Studi di Trieste (Italy)
N. Mahne, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
D. Cocco, SLAC National Accelerator Lab. (United States)
F. Capotondi, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
E. Pedersoli, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
M. Manfredda, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
C. Svetina, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Univ. degli Studi di Trieste (Italy)
N. Mahne, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
D. Cocco, SLAC National Accelerator Lab. (United States)
F. Capotondi, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
E. Pedersoli, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
M. Manfredda, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
M. Kiskinova, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
B. Keitel, Deutsches Elektronen-Synchrotron (Germany)
G. Brenner, Deutsches Elektronen-Synchrotron (Germany)
E. Plönjes, Deutsches Elektronen-Synchrotron (Germany)
T. Mey, Laser-Lab. Göttingen e.V. (Germany)
K. Mann, Laser-Lab. Göttingen e.V. (Germany)
M. Zangrando, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Lab. TASC, CNR, Istituto Officina de Materiali (Italy)
B. Keitel, Deutsches Elektronen-Synchrotron (Germany)
G. Brenner, Deutsches Elektronen-Synchrotron (Germany)
E. Plönjes, Deutsches Elektronen-Synchrotron (Germany)
T. Mey, Laser-Lab. Göttingen e.V. (Germany)
K. Mann, Laser-Lab. Göttingen e.V. (Germany)
M. Zangrando, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Lab. TASC, CNR, Istituto Officina de Materiali (Italy)
Published in SPIE Proceedings Vol. 9208:
Adaptive X-Ray Optics III
Stephen L. O'Dell; Ali M. Khounsary, Editor(s)
© SPIE. Terms of Use
