Author: Diviacco, B.
Paper Title Page
TUP085 FERMI Status Report 564
 
  • M. Svandrlik, E. Allaria, F. Bencivenga, C. Callegari, F. Capotondi, D. Castronovo, P. Cinquegrana, M. Coreno, R. Cucini, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, E. Ferrari, P. Finetti, L. Fröhlich, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, L. Giannessi, M. Kiskinova, S. Krecic, M. Lonza, N. Mahne, C. Masciovecchio, M. Milloch, F. Parmigiani, G. Penco, L. Pivetta, O. Plekan, M. Predonzani, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, C. Spezzani, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  FERMI, the seeded FEL lo­cated at the Elet­tra lab­o­ra­tory in Tri­este, Italy, is now in reg­u­lar op­er­a­tion for users with its first FEL line, FEL-1, which cov­ers the wave­length range be­tween 100 and 20 nm. We will give an overview of the typ­i­cal op­er­at­ing modes of the fa­cil­ity for users and we will re­port on the sta­tus of beam­lines and ex­per­i­men­tal sta­tions. Three beam­lines are now opened for users, three more are in con­struc­tion. Mean­while, the sec­ond FEL line of FERMI, FEL-2, a HGHG dou­ble stage cas­cade cov­er­ing the wave­length range 20 to 4 nm is still under com­mis­sion­ing; we will re­port on the lat­est re­sults in par­tic­u­lar at the short­est wave­length, 4 nm in the fun­da­men­tal.  
 
THA02 Experimental Characterization of FEL Polarization Control with Cross Polarized Undulators 644
 
  • E. Ferrari, E. Allaria, G. De Ninno, B. Diviacco, D. Gauthier, L. Giannessi, G. Penco, C. Spezzani
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • J. Buck, M. Ilchen
    XFEL. EU, Hamburg, Germany
  • G. De Ninno, D. Gauthier
    University of Nova Gorica, Nova Gorica, Slovenia
  • L. Giannessi
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • Z. Huang, A.A. Lutman
    SLAC, Menlo Park, California, USA
  • G. Lambert, B. Mahieu
    LOA, Palaiseau, France
  • J. Viefhaus
    DESY, Hamburg, Germany
  
  Po­lar­iza­tion con­trol of the co­her­ent ra­di­a­tion is be­com­ing an im­por­tant fea­ture of re­cent and fu­ture short wave­length free elec­tron laser fa­cil­i­ties. While po­lar­iza­tion tun­ing can be achieved tak­ing ad­van­tage of spe­cially de­signed un­du­la­tors, a scheme based on two con­sec­u­tive un­du­la­tors emit­ting or­thog­o­nally po­lar­ized fields has also been pro­posed. De­vel­oped ini­tially in syn­chro­tron ra­di­a­tion sources, crossed po­lar­ized un­du­la­tor schemes could ben­e­fit from the co­her­ent emis­sion that char­ac­ter­ize FELs. In this work we re­port the first de­tailed ex­per­i­men­tal char­ac­ter­i­za­tion of the po­lar­iza­tion prop­er­ties of an FEL op­er­ated with crossed po­lar­ized un­du­la­tors in the Soft-X-Rays. As­pects con­cern­ing the av­er­age de­gree of po­lar­iza­tion and the shot to shot sta­bil­ity are in­ves­ti­gated to­gether with a com­par­i­son of the per­for­mance of var­i­ous schemes to con­trol and switch the po­lar­iza­tion  
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