• M. Hagelstein, T. Baumbach, S. Casalbuoni, A.W. Grau, B. Kostka, R. Rossmanith, D. Saez de Jauregui
  FZK, Karlsruhe
• A. Bernhard, D. Wollmann
  KIT, Karlsruhe
• J. Chavanne, P. Elleaume
  ESRF, Grenoble
• B. Diviacco
  ELETTRA, Basovizza
• E.M. Mashkina
  University Erlangen-Nurnberg, Institute of Condensed Matter Physics, Erlangen
• E.J. Wallén
  MAX-lab, Lund

Within the framework of a joint research activity of the European project IA-SFS (RII3-CT2004-506008) four synchrotron facilities have jointly developed diagnostic systems for superconducting undulators. Four work packages have been successfully completed: Design and construction of a test cryostat for field measurements; design and construction of a mock-up coil; field measurement and field error compensation; diagnostics and measurement of the spectrum of low energy electrons responsible for beam heat load in a superconducting undulator. The development advanced the knowledge of magnetic field error compensation considerably and might be of help in understanding the different beam heat load sources. Based on the development a second generation planar superconducting undulator with 15 mm period length for the synchrotron light source ANKA has been specified and procured.

• D. Zangrando, R. Bracco, B. Diviacco, D. La Civita, D. Millo, M. Musardo, G. Tomasin, R. Visintini
  ELETTRA, Basovizza
• F. Becheri, J. Campmany, C. Colldelram, D. Einfeld, J.V. Gigante, R. Ranz
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

Two variable polarization undulators have been designed and constructed as a Collaboration between CELLS and Sincrotrone Trieste*. In this paper the main magnetic and mechanical feature are summarized. Field optimization techniques are described, showing the achieved performance in terms of phase, trajectory and field integral errors.

*D.Zangrando et al. Design of two variable polarization undulators for the ALBA project, EPAC 2008, Genova, Italy