Author: Chiadroni, E.
Paper Title Page
TUPO008 Electron Linac Optimization for Driving Bright Gamma-ray Sources based on Compton Back-scattering 1461
 
  • L. Serafini, F. Broggi, C. De Martinis, D. Giove
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • D. Alesini, P. Antici, A. Bacci, M. Bellaveglia, R. Boni, E. Chiadroni, G. Di Pirro, A. Esposito, M. Ferrario, A. Gallo, G. Gatti, A. Ghigo, E. Pace, A.R. Rossi, B. Spataro, P. Tomassini, C. Vaccarezza
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • C. Maroli, V. Petrillo
    Universita' degli Studi di Milano, Milano, Italy
  • M. Migliorati, A. Mostacci, L. Palumbo
    Rome University La Sapienza, Roma, Italy
  
  We study the op­ti­mal lay-out and RF fre­quen­cy for a room tem­per­a­ture GeV-class Elec­tron Linac aim­ing at pro­duc­ing elec­tron beams that en­hance gam­ma-ray sources based on Comp­ton back-scat­ter­ing. These emerg­ing novel sources, gen­er­at­ing tun­able, mono-chro­mat­ic, bright pho­ton beams in the range of 5-20 MeV for nu­cle­ar physics as well as nu­cle­ar en­gi­neer­ing, rely on both, high qual­i­ty elec­tron beams and J-class high rep­e­ti­tion-rate syn­chro­nized laser sys­tems in order to achieve the max­i­mum spec­tral den­si­ty of the gam­ma-ray beam (# pho­tons/sec/eV). The best op­tion among the con­ven­tion­al­ly used RF linac-bands (S, C, X) and pos­si­ble hy­brid schemes will be an­a­lyzed and dis­cussed, fo­cus­ing the study in terms of best per­for­mances for the gam­ma-ray source, its re­li­a­bil­i­ty and com­pact­ness. We show that the best pos­si­ble can­di­dates for a Gam­ma-ray driv­er are quite sim­i­lar to those of FEL Linacs.  
 
THYB01 Advanced Beam Manipulation Techniques at SPARC 2877
 
  • A. Mostacci, D. Alesini, P. Antici, A. Bacci, M. Bellaveglia, R. Boni, M. Castellano, E. Chiadroni, G. Di Pirro, A. Drago, M. Ferrario, A. Gallo, G. Gatti, A. Ghigo, E. Pace, A.R. Rossi, B. Spataro, C. Vaccarezza
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • B. Marchetti
    INFN-Roma II, Roma, Italy
  • M. Migliorati
    University of Rome "La Sapienza", Rome, Italy
  • L. Palumbo
    Rome University La Sapienza, Roma, Italy
  • V. Petrillo, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma), Italy
  
  SPARC in Fras­cati is a high bright­ness pho­to-in­jec­tor used to drive Free Elec­tron Laser ex­per­i­ments and ex­plore ad­vanced beam ma­nip­u­la­tion tech­niques. The R&D ef­fort made for the op­ti­miza­tion of the beam pa­ram­e­ters will be pre­sent­ed here, to­geth­er with the major ex­per­i­men­tal re­sults achieved. In par­tic­u­lar, we will focus on the gen­er­a­tion of sub-pi­cosec­ond, high bright­ness elec­tron bunch trains via ve­loc­i­ty bunch­ing tech­nique (the so called comb beam). Such bunch trains can be used to drive tun­able and nar­row band THz sources, FELs and plas­ma wake field ac­cel­er­a­tors.  
slides icon Slides THYB01 [20.772 MB]  
 
THPC100 Full Temporal Reconstruction using an Advanced Longitudinal Diagnostic at the SPARC FEL 3119
 
  • G. Marcus, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  • M. Artioli, F. Ciocci, L. Giannessi, A. Petralia, M. Quattromini, V. Surrenti
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • A. Bacci, M. Bellaveglia, E. Chiadroni, G. Di Pirro, M. Ferrario, G. Gatti, A. Mostacci, A.R. Rossi
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • V. Petrillo
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • J.V. Rau
    ISM-CNR, Rome, Italy
  
  The Pro­duc­tion of ul­tra-short (sub 100 fs) sin­gle-spike ra­di­a­tion pos­sess­ing full lon­gi­tu­di­nal co­her­ence from a free-elec­tron laser (FEL) has been the sub­ject of in­tense study. A Fre­quen­cy-Re­solved Op­ti­cal Gat­ing (FROG) di­ag­nos­tic has been de­vel­oped and test­ed at UCLA, which has the ca­pa­bil­i­ty of pro­vid­ing a lon­gi­tu­di­nal re­con­struc­tion of these ul­tra-fast puls­es. This paper re­ports the re­sults of the ap­pli­ca­tion of the di­ag­nos­tic at the SPARC FEL fa­cil­i­ty.  
 
THPS101 Present and Perspectives of the Sparc THz Source 3669
 
  • E. Chiadroni, M. Bellaveglia, M. Boscolo, M. Castellano, G. Di Pirro, M. Ferrario, G. Gatti, E. Pace, C. Vaccarezza
    INFN/LNF, Frascati (Roma), Italy
  • P. Calvani, S. Lupi, A. Nucara
    Università di Roma I La Sapienza, Roma, Italy
  • L. Catani, B. Marchetti
    INFN-Roma II, Roma, Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • O. Limaj
    University of Rome La Sapienza, Rome, Italy
  • A. Mostacci, L. Palumbo
    Rome University La Sapienza, Roma, Italy
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma), Italy
  
  The de­vel­op­ment of ra­di­a­tion sources in the THz spec­tral re­gion has be­come more and more in­ter­est­ing be­cause of the pe­cu­liar char­ac­ter­is­tics of this ra­di­a­tion: it is non ion­iz­ing, it pen­e­trates di­electrics, it is high­ly ab­sorbed by polar liq­uids, high­ly re­flect­ed by met­als and re­veals spe­cif­ic "fin­ger­print" ab­sorp­tion spec­tra aris­ing from fun­da­men­tals phys­i­cal pro­cess­es. The THz source at SPARC is an ac­cel­er­a­tor based source for re­search in­ves­ti­ga­tions (e.g. ma­te­ri­al sci­ence, bi­ol­o­gy fields). Its mea­sured peak power is of the order of 108 W, very com­pet­i­tive with re­spect to other pre­sent sources. The pre­sent sta­tus of the source is pre­sent­ed and fu­ture per­spec­tives are pre­sent­ed.  
 
THPS102 Novel Schemes for the Narrow Band Sparc THz Source using a Comb like e-beam 3672
 
  • B. Marchetti
    INFN-Roma II, Roma, Italy
  • M. Boscolo, M. Castellano, E. Chiadroni, M. Ferrario, B. Spataro, C. Vaccarezza
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma), Italy
  
  The de­vel­op­ment of ra­di­a­tion sources in the THz spec­tral re­gion has be­come more and more in­ter­est­ing be­cause of the pe­cu­liar char­ac­ter­is­tics of this ra­di­a­tion: it is non ion­iz­ing, it pen­e­trates di­electrics, it is high­ly ab­sorbed by polar liq­uids, high­ly re­flect­ed by met­als and re­veals spe­cif­ic "fin­ger­print" ab­sorp­tion spec­tra aris­ing from fun­da­men­tals phys­i­cal pro­cess­es. The THz source at SPARC is an ac­cel­er­a­tor based source for re­search in­ves­ti­ga­tions (e.g. ma­te­ri­al sci­ence, bi­ol­o­gy fields). By means of e-beam ma­nip­u­la­tion tech­nique, a lon­gi­tu­di­nal mod­u­lat­ed beam, the so-called comb beam, can be pro­duced at Sparc. In terms of THz sources, such e-beam dis­tri­bu­tion al­lows to pro­duce high in­ten­si­tiy nar­row band THz ra­di­a­tion, whose spec­trum strong­ly de­pends on the charge dis­tri­bu­tion in­side the e-beam. Dif­fer­ent linac schemes are com­pared. In par­tic­u­lar, spec­tra ob­tained using the comb-beam com­pres­sion through ve­loc­i­ty bunch­ing in­clud­ing a IV har­mon­ic RF sec­tion is showed.