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Proceedings Paper

Hybrid electromagnet/permanent magnet helical undulator: first results
Author(s): Andrei Rogalev; Jose Goulon; Gisele Benayoun; Pascal Elleaume; Joel Chavanne; Christophe Penel; Pierre Van Vaerenbergh
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Paper 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.

Paper Details

Date Published: 16 November 1999
PDF: 9 pages
Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); doi: 10.1117/12.370100
Show Author Affiliations
Andrei Rogalev, European Synchrotron Radiation Facility (France)
Jose Goulon, European Synchrotron Radiation Facility (France)
Gisele Benayoun, European Synchrotron Radiation Facility (France)
Pascal Elleaume, European Synchrotron Radiation Facility (France)
Joel Chavanne, European Synchrotron Radiation Facility (France)
Christophe Penel, European Synchrotron Radiation Facility (France)
Pierre Van Vaerenbergh, European Synchrotron Radiation Facility (France)


Published in SPIE Proceedings Vol. 3773:
X-Ray Optics Design, Performance, and Applications
Ali M. Khounsary; Andreas K. Freund; Tetsuya Ishikawa; George Srajer; Jonathan C. Lang, Editor(s)

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