• E.M. Mashkina, A.J. Magerl
  University Erlangen-Nurnberg, Institute of Condensed Matter Physics, Erlangen
• C. Boffo, M. Borlein, W. Walter
  BNG, Würzburg
• S. Casalbuoni, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
  FZK, Karlsruhe
• N. Vassiljev
  University Erlangen-Nuernberg, Institute of Condensed Matter Physics, Erlangen

A new 15 mm period, 1.5 m long planar undulator is being fabricated by Babcock Noell GmbH (BNG) for the ANKA synchrotron light source. In order to qualify the production process and to optimize both the quench protection scheme and the magnetic field correction system, a short prototype has been fabricated. The prototype has been tested in vertical configuration and liquid helium at 4.2K in the CASPER facility at ANKA. The magnetic field has been measured along the beam axis direction by Hall probes with a positioning precision of 3 μm. We report here on the field shimming scheme and the resulting performance of the coils.