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Meyer-Reumers, M.

Paper Title Page
WEPPH016 The SPARC FEL Undulator System: Magnetic and Mechanical Characterizations  
 
  • F. Ciocci, G. Dattoli, A. Doria, E. Giovenale, A. Lo Bue, M. Quattromini, G. Ronci, M. Sassi, L. Semeraro, E. Sabia
    ENEA C. R. Frascati, Frascati (Roma)
  • D. Doelling, H.-U. Klein, P. A. Komorowski, D. Krischel, M. Meyer-Reumers
    ACCEL, Bergisch Gladbach
 
  Strict tolerances are required on the magnetic field quality of the SPARC undulators in order to met the condition of saturation in about 12 meters of magnetic length and to ensure the design performances, which foresee the simultaneous operation at the fundamental and at higher harmonics. The undulator sections have been realised at ACCEL instruments and have been passed different tests aimed at characterizing the requirements of magnetic field and mechanical precision. We describe the various magnetic and mechanical test performed either at ACCEL and at the ENEA Frascati Labs. In particular we will report on a) Quality of the magnetic field, namely phase error, roll-off of the transverse magnetic field components along the beam axis and minimization of the errors of the field integrals and integrated multipoles calculated along the transversal beam axis, and their dependence on the gap b) Mechanical issues connected with the proper identification of the geometrical and magnetic axes and with the control of the gap tuning We will in particular comment on the issues associated with he proper understanding of the phase advance and how this parameter is related to other quantities of paramount importance as ΔK/K . Furthermore we will also discuss the observed undulator harmonic content using an appropriate Fourier analysis of the experimental data.