Soft to firm x-ray spectroscopy at a hard x-ray facility: polarization-sensitive experiments

Jose Goulon; H. Emerich; Carlos M. Giles; Cecile Malgrange; Nicholas B. Brookes; Francesco Sette; L. Braicovich

doi:10.1117/12.138696

20 January 1993 Soft to firm x-ray spectroscopy at a hard x-ray facility: polarization-sensitive experiments

Jose Goulon, H. Emerich, Carlos M. Giles, Cecile Malgrange, Nicholas B. Brookes, Francesco Sette, L. Braicovich

Proceedings Volume 1740, Optics for High-Brightness Synchrotron Radiation Beamlines; (1993) https://doi.org/10.1117/12.138696
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The ESRF beamline #6 is dedicated to polarization dependent spectroscopies at excitation energies ranging from 0.4 up to 20 keV. This broad energy range will be covered with two helical undulators (Helios-I and Helios II) providing the user with a full control of the photon polarization. Two kinds of optics will be made available: (1) low energy experiments (0.4 keV <EQ E <EQ 2.0 keV) will be carried out on a side-branch beamline equipped with a 'Dragon-type' grating spectrometer; (2) single crystal Bragg optics will be used above 2 keV on the straight branch part of the beamline. We report on the present status and optical arrangement of both branches. Special emphasis is put onto the polarization transfer in Bragg optics with elliptically or circularly polarized light. Various experimental configurations have been evaluated with respect to the figure of merit I.(tau) ², where I is the transmitted intensity and (tau) is the circular polarization rate. Operation of the beamline will start with a simplified, conservative optical configuration, while more challenging options require specific technical developments.

Citation Download Citation

Jose Goulon, H. Emerich, Carlos M. Giles, Cecile Malgrange, Nicholas B. Brookes, Francesco Sette, and L. Braicovich "Soft to firm x-ray spectroscopy at a hard x-ray facility: polarization-sensitive experiments", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); https://doi.org/10.1117/12.138696

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