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. 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.
|Source||UE56-1 slicing (Elliptical Undulator)|
|Monochromator||Reflection Zone Plate Arrray (RZPA)|
|Energy range||410 - 1330 eV|
|Flux||1·106ph/sec/0.1%BW@6kHz (100 fs pulses)|
|Divergence horizontal||0.2 mrad|
|Divergence vertical||0.1 mrad|
|Focus size (hor. x vert.)||140µmx40µm(slit) (hxv)|
|Distance Focus/last valve||800 mm|
|Height Focus/floor level||1763 mm|
References / Latest Publications
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 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).
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