Author: Demidovich, A.A.
Paper Title Page
TUPEA010 FERMI Seeded FEL Progress Report 1182
 
  • M. Svandrlik, E. Allaria, F. Bencivenga, C. Callegari, F. Capotondi, D. Castronovo, P. Cinquegrana, P. Craievich, I. Cudin, G. D'Auria, M. Dal Forno, M.B. Danailov, R. De Monte, G. De Ninno, 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, L. Giannessi, M. Kiskinova, G.L. Loda, M. Lonza, B. Mahieu, N. Mahne, C. Masciovecchio, F. Parmigiani, G. Penco, O. Plekan, M. Predonzani, E. Principi, L. Raimondi, F. Rossi, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, S. Spampinati, C. Spezzani, L. Sturari, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • P. Craievich
    PSI, Villigen PSI, Switzerland
  • B. Mahieu
    CEA/DSM/DRECAM/SPAM, Gif-sur-Yvette, France
 
  Funding: Work supported in part by the Italian Ministry of University and Research under grants FIRB-RBAP045JF2 and FIRB-RBAP06AWK3
FERMI, the seeded Free Elec­tron Laser lo­cated at the Elet­tra lab­o­ra­tory in Tri­este, Italy, wel­comed in De­cem­ber 2012 the first ex­ter­nal users on the FEL-1 line. This line is based on a sin­gle stage of High Gain Har­monic Gen­er­a­tion (HGHG), seeded by a UV laser, and cov­ers wave­lengths be­tween 80 and 20 nm. The pho­ton en­ergy reached more than 300 μJ. The sec­ond FEL line, FEL-2, cov­er­ing the lower wave­length range be­tween 20 and 4 nm thanks to a dou­ble stage cas­caded HGHG scheme, has gen­er­ated its first co­her­ent pho­tons in Oc­to­ber 2012. This is the first ex­per­i­men­tal demon­stra­tion of a seeded free elec­tron laser con­fig­ured as a two stages cas­cade op­er­at­ing in the "fresh bunch in­jec­tion” mode, where the sec­ond stage is seeded by the light pro­duced by the first stage. This paper de­scribes the sta­tus of the op­er­a­tion and user ex­per­i­ments with FEL-1 and re­ports about the progress in the com­mis­sion­ing of FEL-2.
 
 
TUPEA011 Double Stage Seeded FEL with Fresh Bunch Injection Technique at FERMI@Elettra 1185
 
  • S. Di Mitri, E. Allaria, D. Castronovo, P. Cinquegrana, P. Craievich, G. D'Auria, M.B. Danailov, G. De Ninno, A.A. Demidovich, B. Diviacco, W.M. Fawley, M. Ferianis, E. Ferrari, L. Fröhlich, G. Gaio, L. Giannessi, R. Ivanov, B. Mahieu, N. Mahne, I. Nikolov, F. Parmigiani, G. Penco, L. Raimondi, C. Serpico, P. Sigalotti, S. Spampinati, C. Spezzani, M. Svandrlik, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, D. Zangrando, M. Zangrando
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • D. Gauthier
    University of Nova Gorica, Nova Gorica, Slovenia
 
  Dur­ing the month of Oc­to­ber 2012 the com­mis­sion­ing of the light source FEL-2 at FERMI was suc­cess­fully con­cluded. Fermi FEL-2 is the first seeded FEL op­er­at­ing with a dou­ble stage cas­cade in the "fresh bunch in­jec­tion" mode*. The two stages are two high gain har­monic gen­er­a­tion FELs where the first stage is seeded by the 3rd har­monic of a Ti:Sa laser sys­tem, which is up con­verted to the 4th-12th har­monic. The out­put of the first stage is then used to seed the sec­ond stage. A final wave­length of 10.8 nm was ob­tained as the 24th har­monic of the seed wave­length at the end of the two fre­quency con­ver­sion processes, demon­strat­ing that the FEL is ca­pa­ble of pro­duc­ing sin­gle mode nar­row band­width pulses with an en­ergy of sev­eral tens ofμjoules. We re­port on the ex­per­i­men­tal char­ac­ter­i­sa­tion of the FEL per­for­mances in this con­fig­u­ra­tion.
* I. Ben-Zvi, K. M. Yang, L. H. Yu, ”The ”fresh-bunch” technique in FELs”, NIM A 318 (1992), p 726-729