Soft X-ray fs-to-ps pulsed undulator radiation variable polarization with Zone Plate Mono for FEMTOS
The ZPM-monochromator was particularly designed and commissioned according to user requirements to support optical-pump- soft x-ray probe experiments at the FemtoSpex facility at the UE56-1.
|Source||UE56-1 slicing (Elliptical Undulator)|
|Monochromator||Reflection Zone Plate Arrray (RZPA)|
|Energy range||410 - 1330 eV|
|Flux||1·106 ph/sec/0.1%BW@6kHz (100 fs pulses)|
|Divergence horizontal||0.2 mrad|
|Divergence vertical||0.1 mrad|
|Focus size (hor. x vert.)||140 µm x 40 µm (slit)|
|Distance Focus/last valve||800 mm|
|Height Focus/floor level||1763 mm|
The ZPM-monochromator was particularly designed and commissioned according to user requirements to support optical-pump- soft x-ray probe experiments at the FemtoSpex facility at the UE56-1. Owing to the principles of generating 100 fs x-ray pulses from a storage ring  one needs optics of highest possible transmission up to 21%. A successful approach has been a single element monochromator based on Reflection Zone Plates . The current design as depicted in Figure 1 (right) consists of 9 lenses that enable a working range from 410 to 1333 eV at moderate spectral resolutions of E/DE= 500 or, in one case E/DE = 2000, at 713 eV. The optics is tailored to minimize pulse elongations to 30 fs preserving the polarization properties of the elliptical light from the undulator.
References / Latest Publications
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 Brzhezinskaya, M, et al. Journal of Synchrotron Radiation 20, 522-530 (2013).
 Stamm, C. et al., Nature Materials 6, 740–743 (2007).
 Boeglin, C. et al., Nature 465, 458–462 (2010).
 Wietstruk, M. et al., Phys. Rev. Lett. 106, 127401 (2011).
 Radu, I. et al., Nature 472, 205–209 (2011).
 Eschenlohr, A. et al., Nature Materials 12, 332–336 (2013).
 Bergerard, N. et al. Nature Communications, 5, 3466, doi:10.1038/ncomms4466.