Author: Romeo, S.
Paper Title Page
WEYD2
 First Lasing of a Free-Electron Laser With a Compact Beam-Driven Plasma Accelerator  
 
  • S. Romeo, M. Galletti, R. Pompili
    LNF-INFN, Frascati, Italy
  
  Plasma-based tech­nol­ogy promises a rev­o­lu­tion in the field of par­ti­cle ac­cel­er­a­tors by push­ing beams to GeV en­er­gies within cen­time­ter dis­tances and en­abling the re­al­iza­tion of ul­tra-com­pact fa­cil­i­ties for user ap­pli­ca­tions like Free-Elec­tron Lasers (FEL). Here we re­port the first ex­per­i­men­tal ev­i­dence of FEL las­ing by a com­pact (3 cm) par­ti­cle beam-dri­ven plasma ac­cel­er­a­tor. FEL ra­di­a­tion is ob­served in the in­frared range with typ­i­cal ex­po­nen­tial growth of its in­ten­sity over six con­sec­u­tive un­du­la­tors. This achieve­ment is based on the tech­nique we re­cently de­vel­oped for en­ergy spread con­trol dur­ing ac­cel­er­a­tion in plasma, gen­er­at­ing elec­tron bunches with high-qual­ity, com­pa­ra­ble with state-of-the-art ac­cel­er­a­tors. This proof-of-prin­ci­ple ex­per­i­ment rep­re­sents an im­por­tant mile­stone in the use of plasma-based ac­cel­er­a­tors con­tribut­ing to the de­vel­op­ment of next-gen­er­a­tion com­pact ma­chines for user-ori­ented ap­pli­ca­tions.  
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