Author: Ferianis, M.
Paper Title Page
MOPC04 Electron Beam Collimation for Slice Diagnostics and Generation of Femtosecond Soft X-Ray Pulses from a Free Electron Laser 49
 
  • S. Di Mitri, M. Bossi, D. Castronovo, I. Cudin, M. Ferianis, L. Fröhlich
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  We pre­sent the ex­per­i­men­tal re­sults of fem­tosec­ond slic­ing an ul­tra-rel­a­tivis­tic, high bright­ness elec­tron beam with a col­li­ma­tor*. We demon­strate that the col­li­ma­tion process pre­serves the slice beam qual­ity, in agree­ment with our the­o­ret­i­cal ex­pec­ta­tions, and that the col­li­ma­tion is com­pat­i­ble with the op­er­a­tion of a lin­ear ac­cel­er­a­tor. Thus, it turns out to be a more com­pact and cheaper so­lu­tion for elec­tron slice di­ag­nos­tics than com­monly used ra­diofre­quency de­flect­ing cav­i­ties and hav­ing min­i­mal im­pact on the ma­chine de­sign. The col­li­mated beam can also be used for the gen­er­a­tion of sta­ble fem­tosec­ond soft x-ray pulses of tun­able du­ra­tion from a free elec­tron laser.
* S. Di Mitri et al., Phys. Rev. Special Topics - Accel. Beams 16, 042801 (2013). 		 
 
TUAL1 Longitudinal Phase Space Characterization at FERMI@Elettra 303
 
  • E. Ferrari, E. Allaria, P. Cinquegrana, M. Ferianis, L. Fröhlich, L. Giannessi, G. Penco, M. Predonzani, F. Rossi, P. Sigalotti, M. Veronese
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • E. Ferrari
    Università degli Studi di Trieste, Trieste, Italy
  
  The seeded FEL FERMI@​Elettra has com­pleted the com­mis­sion­ing of FEL1 line, and it is now pro­vid­ing the User Com­mu­nity with a co­her­ent and tun­able UV ra­di­a­tion (from 70nm to 20nm) in a num­ber of dif­fer­ent con­fig­u­ra­tions, in­clud­ing an orig­i­nal twin-seeded pump-probe scheme. Among the key sub sys­tems for the op­er­a­tion of FERMI@​Elettra, there are the femto sec­ond op­ti­cal tim­ing sys­tem, some ded­i­cated lon­gi­tu­di­nal di­ag­nos­tics, specif­i­cally de­vel­oped for FERMI@​Elettra and, of course, state of art laser sys­tems. In this paper, after a short re­view of the FERMI@​Elettra op­ti­cal tim­ing sys­tem and of its rou­tinely achieved per­for­mances, we focus on the re­sults ob­tained from the suite of lon­gi­tu­di­nal di­ag­nos­tics (Bunch Ar­rival Mon­i­tor, Elec­tro Op­ti­cal sam­pling sta­tion and RF de­flec­tors) all op­er­at­ing in sin­gle shot and with 10s fs res­o­lu­tion which demon­strate the FERMI@​Elettra achieved per­for­mances. The re­sults from these lon­gi­tu­di­nal di­ag­nos­tics are com­pared and shot to shot cor­re­lated with the re­sults ob­tained from an in­de­pen­dent lon­gi­tu­di­nal mea­sure­ment tech­nique, based on a spec­trom­e­ter mea­sure­ment of a lin­early chirped elec­tron bunch, which fur­ther val­i­date the FERMI@​Elettra op­er­a­tion.  
slides icon Slides TUAL1 [10.689 MB]  
 
WEPF27 Coherent Ultraviolet Radiation Measurements of Laser Induced Bunching in a Seeded FEL 879
 
  • M. Veronese, A. Abrami, E. Allaria, M. Ferianis, E. Ferrari, M. Trovò
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • F. Cianciosi
    ESRF, Grenoble, France
  
  Op­ti­miza­tion of the bunch­ing process in a seeded FEL like FERMI@​Elettra is an im­por­tant as­pect for ma­chine op­er­a­tion. In this paper we dis­cuss about the power de­tec­tion of co­her­ent ra­di­a­tion in the UV range as a valu­able method for op­ti­miz­ing the bunch­ing in­duced by the seed­ing process on the elec­tron beam. Ex­per­i­men­tal re­sults ob­tained at FERMI@​Elettra are pre­sented here. Mea­sure­ments of UV co­her­ent tran­si­tion and dif­frac­tion ra­di­a­tion have been used to quan­tify the bunch­ing pro­duced by the seed laser at lower laser har­mon­ics. The de­pen­dence of the laser in­duced CUVTR sig­nal on var­i­ous pa­ra­me­ters is ex­per­i­men­tally stud­ied. Fu­ture up­grades and pos­si­bil­i­ties for bunch­ing mea­sure­ments at short­est wave­lengths are also dis­cussed.