New Journal of Physics (Jan 2016)

Femtosecond timing-jitter between photo-cathode laser and ultra-short electron bunches by means of hybrid compression

  • R Pompili,
  • M P Anania,
  • M Bellaveglia,
  • A Biagioni,
  • G Castorina,
  • E Chiadroni,
  • A Cianchi,
  • M Croia,
  • D Di Giovenale,
  • M Ferrario,
  • F Filippi,
  • A Gallo,
  • G Gatti,
  • F Giorgianni,
  • A Giribono,
  • W Li,
  • S Lupi,
  • A Mostacci,
  • M Petrarca,
  • L Piersanti,
  • G Di Pirro,
  • S Romeo,
  • J Scifo,
  • V Shpakov,
  • C Vaccarezza,
  • F Villa

DOI
https://doi.org/10.1088/1367-2630/18/8/083033
Journal volume & issue
Vol. 18, no. 8
p. 083033

Abstract

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The generation of ultra-short electron bunches with ultra-low timing-jitter relative to the photo-cathode (PC) laser has been experimentally proved for the first time at the SPARC_LAB test-facility (INFN-LNF, Frascati) exploiting a two-stage hybrid compression scheme. The first stage employs RF-based compression (velocity-bunching), which shortens the bunch and imprints an energy chirp on it. The second stage is performed in a non-isochronous dogleg line, where the compression is completed resulting in a final bunch duration below 90 fs (rms). At the same time, the beam arrival timing-jitter with respect to the PC laser has been measured to be lower than 20 fs (rms). The reported results have been validated with numerical simulations.

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