16 November 1999 Hybrid electromagnet/permanent magnet helical undulator: first results
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrei Rogalev, Andrei Rogalev, Jose Goulon, Jose Goulon, Gisele Benayoun, Gisele Benayoun, Pascal Elleaume, Pascal Elleaume, Joel Chavanne, Joel Chavanne, Christophe Penel, Christophe Penel, Pierre Van Vaerenbergh, Pierre Van Vaerenbergh, } "Hybrid electromagnet/permanent magnet helical undulator: first results", Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); doi: 10.1117/12.370100; https://doi.org/10.1117/12.370100


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