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Bracco, R.

Paper Title Page
WEPC116 FERMI@Elettra Undulator Frame Study 2276
 
  • D. La Civita, R. Bracco, B. Diviacco, G. Tomasin, D. Zangrando
    ELETTRA, Basovizza, Trieste
 
  The FERMI@Elettra project foresees installation of both linear (LPU) and elliptical polarization undulators (EPU). Following the girder study presented last year, a detailed design of the undulator frame has been now carried out. The aim of this work was to find out a mechanical structure that guarantees minimum displacement of the girders supporting the magnet arrays. At the same time the undulator overall dimensions have been taken into account and the mechanical structure mass minimized. In this paper topology optimization result, finite element simulation and multi-objective optimization analysis are presented.  
WEPC122 Magnetic Characterization of an APPLE-II Undulator Prototype for FERMI@Elettra 2294
 
  • B. Diviacco, R. Bracco, C. Knapic, D. La Civita, D. Millo, M. Musardo, G. Tomasin, D. Zangrando
    ELETTRA, Basovizza, Trieste
 
  The FERMI@Elettra free electron lasers will use APPLE-II undulators in the radiating sections to provide variably polarized photon beams. In preparation of the manufacturing of the final devices a prototype has been developed in order to test different methods of magnetic field optimization. For this purpose, an existing variable-gap support structure was equipped with a new mechanical interface providing the required longitudinal shifting of the magnetic arrays. Permanent magnet blocks were mounted on short modules and their field integrals measured using a stretched wire system. Field optimization was iteratively performed by proper selection of the modules to be mounted based on measurements of the partially assembled undulator structure. The results of the final magnetic field characterization are presented showing the achieved trajectory, phase and multipole errors. These results are compared with those of a previous assembly where the same modules were mounted in random order. Further improvements obtained by shimming and application of “magic fingers” are finally described.  
WEPC137 Design of Two Variable Polarization Undulators for the ALBA Project 2329
 
  • D. Zangrando, R. Bracco, B. Diviacco, D. La Civita, M. Musardo, G. Tomasin
    ELETTRA, Basovizza, Trieste
  • F. Becheri, J. Campmany, C. Colldelram, D. Einfeld, J. V. Gigante
    ALBA, Bellaterra
  • Z. Martí
    LLS, Bellaterra (Cerdanyola del Vallès)
 
  This paper summarizes the main aspects of the magnetic, mechanical and control system design of two APPLE-II type undulators presently under construction in the framework of a collaboration between CELLS and Sincrotrone Trieste.