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A hybrid wiggler for synchrotron radiation research program at the VEPP-4 was created in the Budker Institute of Nuclear Physics, Novosibirsk, Russia. The wiggler consists of ordinary poles with coils, which generate a spatially periodic magnetic field equal to 1.75 T. Also, permanent magnets are insertion between the poles for increasing magnet field up to 1.9 T. In this paper, we present the design, calculations, and magnetic measurements for the hybrid wiggler.

The paper describes the design, magnetic computations and measurements of the elliptical undulator HU256 for Synchrotron Soleil (France): the new technology for insertion vacuum chamber has permitted the design of a Bx & Bz dipole closed structure for an electromagnetic undulator. This magnetic design has been realized on the basis of the 2-D, 3-D modeling (Mermaid and RADIA codes), and dependence's of the magnetic field integrals from the main macroscopic parameters have been obtained. The undulator can work in standard and quasi-periodical modes. The single dipoles and the undulator HU256 were magnetically measured by a Hall probes system. The results of magnetic measurements and computations are compared and analyzed