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  • Khan, ShaukatTU Dortmund Univ, Ctr Synchrotron Radiat, Maria Goeppert Mayer Str 2, D-44227 Dortmund, Germany.;TU Dortmund Univ, Dept Phys, Maria Goeppert Mayer Str 2, D-44227 Dortmund, Germany. (author)

Evolution of density-modulated electron beams in drift sections

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • American Physical Society,2024
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-530856
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-530856URI
  • https://doi.org/10.1103/PhysRevAccelBeams.27.040702DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Initiating the amplification process in a short-wavelength free-electron laser (FEL) by external seed laser pulses results in radiation with a high degree of longitudinal and transverse coherence. The basic layout in seeded harmonic generation involves a periodic electron energy modulation by laser-electron interaction in a short undulator (the "modulator"), which is converted into a density modulation in a dispersive section immediately followed by a long FEL undulator (the "radiator") tuned to a harmonic of the seed laser wavelength. With the advent of more complex seeding schemes, density-modulated beams may need to be transported in drift sections before entering the radiator. Long FEL undulators may also contain several drift spaces to accommodate focusing elements and diagnostics. Therefore, it is of general interest to study the evolution of density-modulated electron beams in drift sections under the influence of repulsive Coulomb forces. At FERMI, a seeded FEL user facility in Trieste, Italy, systematic studies of the impact of varying drift length on coherent harmonic emission were undertaken. In order to make the underlying physics transparent, the emphasis of this paper is on reproducing the experimental findings with analytical estimates and a simple one-dimensional numerical model. Furthermore, the Coulomb forces in a drift section may be employed to enhance the laser-induced energy modulation and yield an improved density modulation before entering the FEL radiator.

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  • Perosa, GiovanniUppsala universitet,FREIA,Elettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy.(Swepub:uu)giope951 (author)
  • Sottocorona, FilippoElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy.;Univ Trieste, Dipartimento Fis, Piazzale Europa 1, I-34127 Trieste, Italy. (author)
  • Brynes, AlexanderElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • De Ninno, GiovanniElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy.;Univ Nova Gorica, Lab Quantum Opt, Vipavska 11c, Nova Ajdovscina 5270, Slovenia. (author)
  • Penco, GiuseppeElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • Ribi, Primo z RebernicElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • Spampinati, SimoneElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy.;INFN, Lab Nazl Frascati, Via Enr Fermi 54, I-00044 Frascati, Italy. (author)
  • Spezzani, CarloElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • Trove, MauroElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • Giannessi, LucaElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy.;INFN, Lab Nazl Frascati, Via Enr Fermi 54, I-00044 Frascati, Italy. (author)
  • Allaria, EnricoElettra Sincrotrone Trieste SCpA, Str Statale 14 Km 163 5 AREA Sci Pk, I-34149 Basovizza, Italy. (author)
  • Schneidmiller, EvgenyDeutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • Ferrari, EugenioDeutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • TU Dortmund Univ, Ctr Synchrotron Radiat, Maria Goeppert Mayer Str 2, D-44227 Dortmund, Germany.;TU Dortmund Univ, Dept Phys, Maria Goeppert Mayer Str 2, D-44227 Dortmund, Germany.FREIA (creator_code:org_t)

Related titles

  • In:Physical Review Accelerators and Beams: American Physical Society27:42469-9888

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