LEDS Workshop – Longitudinal Electron beam Dynamics for coherent light Sources

Europe/Rome
ENEA Frascati, Rome

ENEA Frascati, Rome

Via Enrico Fermi, 45, 00044 Frascati RM
Federico Nguyen (ENEA), Simone Di Mitri (Elettra Sincrotrone Trieste)
Description

The workshop aims at collecting the most recent advancements in the controlled generation of high brightness electron beams from photo-injectors for coherent light sources. These include in particular seeded X-ray free-electron lasers and multi-THz superradiant sources. The workshop will move from lessons learned during the CompactLight design study. Theoretical, numerical and experimental studies will be presented and reviewed during round tables. Open routes of research in the manipulation of modulated electron beams will be investigated. Future experiments, supported by specific technological developments, and their comparison with accurate massive simulations, will be proposed in the framework of the LEAPS initiative. A round table for the definition of a LEAPS project proposal is planned at the end of the workshop, and open to all participants.

The program is made of 6 sessions. These include invited talks and round tables (see Scientific Programme). Posters (in format A0, portrait orientation) could be presented under approval by the Local Organizing Committee.

The workshop will take place from October 3 to October 5, 2023. It is hosted by ENEA in Frascati, near Rome, Italy. It is organized by Elettra Sincrotrone Trieste and ENEA, and financed by Elettra Sincrotrone Trieste and LEAPS. The number of participants is limited to 65. Registration is mandatory and participation possible only under approval by the Local Organizing Committee.

The workshop is intended to be in person only. A bus service from Frascati village to ENEA and return will be made available during the workshop.

WIFI connection will be free, through the Eduroam network. Please make sure to have a valid Eduroam account to access (https://eduroam.org/).

Participants
  • Adam Dixon
  • Alberto Petralia
  • Alexander Darius Brynes
  • Alexander Malyzhenkov
  • Andrea Ghigo
  • Andrea Latina
  • Andreas Adelmann
  • Anna Giribono
  • Atoosa Meseck
  • Carlo Spezzani
  • Chris Richard
  • Cristiana Roberti
  • Cristina Vaccarezza
  • Erion Gjonaj
  • Federico Nguyen
  • Gerardo D'Auria
  • Gilles Jacopo Silvi
  • Giovanni Perosa
  • Giuseppe Dattoli
  • Javier Olivares Herrador
  • Liu Zhuoyuan
  • Lixin Yan
  • Luca Giannessi
  • Massimo Ferrario
  • Michele Opromolla
  • Mikhail Krasilnikov
  • Paolo Craievich
  • Peter Williams
  • Philipp Amstutz
  • Philipp Dijkstal
  • Sanae SAMSAM
  • Sara Thorin
  • Sebastiaan van der Geer
  • Simone Di Mitri
  • Simone Spampinati
  • Stefano Deiuri
  • Stuart Walker
  • Thomas Lucas
  • Ulf Lehnert
  • Vitaliy Goryashko
Mrs. Cristiana Roberti
    • 2:00 PM 2:30 PM
      Welcome: Introduction, P. Dattoli (ENEA, retired)

      F. Nguyen (ENEA) and S. Di Mitri (Elettra)

    • 2:30 PM 4:00 PM
      CompactLight, lessons learned: Chair, Federico Nguyen (ENEA)

      Contributions from CompactLight studies on facility design, bunch compression, microbunching instability, seeded free-electron laser schemes.

      • 2:30 PM
        CompactLight: how to write a proposal 30m
        Speaker: Gerardo D'Auria (Elettra Sincrotrone Trieste)
      • 3:00 PM
        CompactLight: bunch compression, microbunching instability and seeding aspects 30m
        Speaker: Andrea Latina (CERN)
      • 3:30 PM
        Beam loading effects in photo-injectors, simulations and measurements 30m
        Speaker: Javier Olivares Herrador (CERN)
    • 4:00 PM 4:20 PM
      Q & A 20m
    • 4:20 PM 4:40 PM
      Break 20m
    • 4:40 PM 6:10 PM
      New coherent light sources: Chair, Peter Williams (STFC, Cockcroft Institute)

      New concepts of FEL sources, from the THz to the X-ray wavelength range, are presented and discussed.

    • 6:10 PM 6:30 PM
      Q & A 20m
    • 8:30 AM 10:00 AM
      On the true origin of microbunching: Chair, Vitaliy Goryashko (Uppsala Univ.)

      Fundamental processes in the production of high brightness electron beams from photo-injectors are investigated, from both the theoretical and the experimental point of view.

      • 8:30 AM
        Considerations for low energy slice energy spread measurements 30m
        Speaker: Christopher James Richard (DESY)
      • 9:00 AM
        Modelling and observation of intrabeam scattering in photoinjectors 30m
        Speaker: Thomas Lucas Geoffrey (PSI)
      • 9:30 AM
        Energy spread measurements at the European XFEL 30m
        Speaker: Stuart Walker (EUXFEL)
    • 10:00 AM 10:30 AM
      Q & A 30m
    • 10:30 AM 10:50 AM
      Break 20m
    • 10:50 AM 12:20 PM
      On the true origin of microbunching: Chair, Anna Giribono (INFN-LNF)

      Fundamental processes in the production of high brightness electron beams from photo-injectors are investigated, from both the theoretical and the experimental point of view.

      • 10:50 AM
        Self-consistent intrabeam scattering methods 30m
        Speaker: Andreas Adelmann (PSI)
      • 11:20 AM
        Intrabeam scattering model from astrophysics 30m
        Speaker: Bas Van der Geer (Pulsar)
      • 11:50 AM
        IBS simulations for the injectors of the EuXFEL and the SwissFEL 30m
        Speaker: Erion Gjonaj (TEMF Darmstadt)
    • 12:20 PM 12:50 PM
      Q & A 30m
    • 12:50 PM 2:00 PM
      Lunch 1h 10m
    • 2:00 PM 3:00 PM
      Diagnostics of microbunching and beam manipulation: Chair, Mikhail Krasilnikov (DESY Zeuthen)

      Diagnotsic tools, techniques, and recent advancements in the characterization and control of modulated electron beams are presented.

      • 2:00 PM
        Widely tunable electron bunch trains for the generation of high-power narrowband 1–10 THz radiation 30m
        Speaker: Lixin Yan (Tsinghua University)
      • 2:30 PM
        Compact and versatile infrared spectrometer for microbunching detection 30m
        Speaker: Carlo Spezzani (Elettra Sincrotrone Trieste)
    • 3:00 PM 3:20 PM
      Q & A 20m
    • 3:20 PM 3:40 PM
      Break
    • 3:40 PM 5:10 PM
      Diagnostics of microbunching and beam manipulation: Chair, Atoosa Meseck (JGU Mainz, HZB)

      Diagnotsic tools, techniques, and recent advancements in the characterization and control of modulated electron beams are presented.

    • 5:10 PM 5:30 PM
      Q & A 20m
    • 7:30 PM 10:00 PM
      Social dinner
    • 8:30 AM 9:30 AM
      Magnetic lattices: Chair, Philipp Amstutz (DESY)

      Advanced studies of magnetic bunch length compression, magnetic linearization, electro-optical control of microbunching instability and coherent synchrotron radiation are reviewed and discussed.

      • 8:30 AM
        Experience with magnetic linearization, longitudinal jitters and outlook to HB-SASE 30m
        Speaker: Sara Thorin (MAX-IV)
      • 9:00 AM
        Bunch compression for FELs – Chicanes or Arcs? 30m
        Speaker: Peter Williams (STFC Daresbury Laboratory & Cockcroft Institute)
    • 9:30 AM 9:50 AM
      Q & A 20m
    • 9:50 AM 10:10 AM
      Break 20m
    • 10:10 AM 11:40 AM
      Magnetic lattices: Chair, Simone Di Mitri (Elettra)

      Advanced studies of magnetic bunch length compression, magnetic linearization, electro-optical control of microbunching instability and coherent synchrotron radiation are reviewed and discussed.

      • 10:10 AM
        Coherent synchrotron radiation and microbunching instability at FERMI 30m
        Speaker: Alexander Darius Brynes (Elettra-Sincrotrone Trieste)
      • 10:40 AM
        Laser heater for a multi-stage compressor superconducting FEL driver 30m
        Speaker: Philipp Amstutz (DESY)
      • 11:10 AM
        Half-wavelength velocity bunching: non-adiabatic temporal focusing of charged particle beams 30m

        X-ray Free-Electron Lasers (XFELs) and MegaElectronVolt Ultrafast Electron Diffractometers (MeV UEDs) are revolutionary scientific instruments that allow visualising the dynamics in a wide range of systems from atoms and molecules to phonons, magnons and plasmons. Femtosecond (fs) electron beams are at the heart of XFELs and MeV UEDs, and the formation of fs electron beams with ultrahigh densities in the phase space is the subject of active research. We report an interesting regime of non-adiabatic compression of electron beams by two orders of magnitude. Via analytical calculations and numerical simulations, we show that few MeV electron beams (an isolate ensemble of electrons in a beam) can be trapped and compressed by a strong electromagnetic field within a half of the wavelength. Furthermore, in a multi-cell accelerating cavity, the bunch is first compressed and then accelerated, thus allowing one to preserve very short bunch duration. For example, a 3 ps 16-pC 1-MeV electron bunch is compressed to 30 fs rms and accelerated to 12 MeV in a TESLA uperconducting cavity. This proposed mechanism of compression, which is another mode of velocity bunching, It opens the door for obtaining very high electron densities in the phase space.

        Speaker: Giovanni Perosa (Uppsala University)
    • 11:40 AM 12:00 PM
      Q & A 20m
    • 12:00 PM 12:30 PM
      LEDS proposal for LEAPS: Close-out