Hybrid electromagnet/permanent magnet helical undulator: first results

Andrei Rogalev; Jose Goulon; Gisele Benayoun; Pascal Elleaume; Joel Chavanne; Christophe Penel; Pierre Van Vaerenbergh

doi:10.1117/12.370100

16 November 1999 Hybrid electromagnet/permanent magnet helical undulator: first results

Andrei Rogalev, Jose Goulon, Gisele Benayoun, Pascal Elleaume, Joel Chavanne, Christophe Penel, Pierre Van Vaerenbergh

Proceedings Volume 3773, X-Ray Optics Design, Performance, and Applications; (1999) https://doi.org/10.1117/12.370100
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A new helical undulator has been built with an hybrid electromagnet/permanent magnet technology and was recently coupled to the ESRF ID12A beamline which is dedicated to polarization dependent X-ray absorption spectroscopy. This insertion device was optimized to produce high fluxes of circularly polarized X-ray photons in the energy range 1.5 - 8 keV. It consists of 19 magnetic periods of length 80 mm with a peak magnetic field of about 0.2 T. With this new undulator, it is possible to flip very rapidly the helicity of the emitted radiation by reversing the current in the coil generating the vertical magnetic field. Magnetic measurements concerning this new insertion device are also reported. Its performances are illustrated by X-ray Natural Circular Dichroism spectra recorded at the Te L-edges with a (alpha) - TeO₂ single crystal.

Citation Download Citation

Andrei Rogalev, Jose Goulon, Gisele Benayoun, Pascal Elleaume, Joel Chavanne, Christophe Penel, and Pierre Van Vaerenbergh "Hybrid electromagnet/permanent magnet helical undulator: first results", Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); https://doi.org/10.1117/12.370100

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