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Advanced X-ray polarimeter design for nuclear resonant scattering
Berit Marx-Glowna1, Ingo Uschmann1, Kai S Schulze1
1Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena, Germany.
Journal of Synchrotron Radiation
|January 5, 2021
Summary
Researchers improved nuclear resonant scattering experiments using advanced polarimeters. This enhances the polarization purity for 57Fe (iron-57) studies at PETRA III.
Area of Science:
- Nuclear Physics
- Materials Science
- Synchrotron Radiation
Background:
- Nuclear resonant scattering (NRS) experiments require high polarization purity.
- Previous polarimeter designs faced limitations in achieving optimal performance for 57Fe (iron-57) studies.
Purpose of the Study:
- To present enhanced designs and testing of channel-cut crystal polarimeters for NRS.
- To improve the degree of polarization purity for 57Fe NRS experiments.
Main Methods:
- Utilized four asymmetric reflections with specific asymmetry angles (α1 = -28°, α2 = 28°, α3 = -28°, α4 = 28°).
- Tested polarimeters based on channel-cut crystals for the 14.4 keV resonance of 57Fe.
Main Results:
- Achieved an improved degree of polarization purity of 2.2 × 10⁻⁹.
- Demonstrated the effectiveness of the new design in enhancing polarization purity.
Conclusions:
- The improved polarimeter design offers superior performance for 57Fe NRS experiments.
- An advanced, beam-offset-free polarimeter is now accessible to users at PETRA III beamline P01.
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