LEDS Workshop – Longitudinal Electron beam Dynamics for coherent light Sources

Oct 3, 2023, 10:00 AM → Oct 5, 2023, 5:30 PM Europe/Rome

ENEA Frascati, Rome

Federico Nguyen (ENEA), Simone Di Mitri (Elettra Sincrotrone Trieste)

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/).

LEDS2023-workshop-poster.pdf

Tuesday, October 3

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

Speaker: Gerardo D'Auria (Elettra Sincrotrone Trieste)

LEDS2023-GerardoDAuria.pdf

3:00 PM CompactLight: bunch compression, microbunching instability and seeding aspects

Speaker: Andrea Latina (CERN)

LEDS2023-Latina_Andrea.pdf

3:30 PM Beam loading effects in photo-injectors, simulations and measurements

Speaker: Javier Olivares Herrador (CERN)

LEDS2023-OlivaresHerrador_Javier.pdf

4:00 PM → 4:20 PM Q & A

4:20 PM → 4:40 PM Break

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.

4:40 PM Linac-driven beam physics at Eupraxia@SPARC_Lab

Speaker: Anna Giribono (INFN-LNF)

LEDS2023-Giribono_Anna.pdf

5:10 PM The DALI project at HZDR

Speaker: Ulf Lehnert (HZDR)

LEDS2023-Lehnert_Ulf.pdf

5:40 PM THz source @ PITZ as pump for X-ray FELs

Speaker: Mikhail Krasilnikov (DESY)

LEDS2023-Mikhail_Krasilnikov.pdf

6:10 PM → 6:30 PM Q & A

Wednesday, October 4

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

Speaker: Christopher James Richard (DESY)

LEDS2023-Richard_Chris.pdf

9:00 AM Modelling and observation of intrabeam scattering in photoinjectors

Speaker: Thomas Lucas Geoffrey (PSI)

9:30 AM Energy spread measurements at the European XFEL

Speaker: Stuart Walker (EUXFEL)

LEDS2023-Walker_Stuart.pdf

10:00 AM → 10:30 AM Q & A

10:30 AM → 10:50 AM Break

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

Speaker: Andreas Adelmann (PSI)

LEDS2023-Adelmann_Andreas.pdf

11:20 AM Intrabeam scattering model from astrophysics

Speaker: Bas Van der Geer (Pulsar)

LEDS2023-Bas van der Geer.pdf

11:50 AM IBS simulations for the injectors of the EuXFEL and the SwissFEL

Speaker: Erion Gjonaj (TEMF Darmstadt)

12:20 PM → 12:50 PM Q & A

12:50 PM → 2:00 PM Lunch

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

Speaker: Lixin Yan (Tsinghua University)

LEDS2023-Yan_Lixin.pdf

2:30 PM Compact and versatile infrared spectrometer for microbunching detection

Speaker: Carlo Spezzani (Elettra Sincrotrone Trieste)

LEDS2023-CarloSpezzani.pdf

3:00 PM → 3:20 PM Q & A

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.

3:40 PM Electron beam manipulation using self-induced fields

Speaker: Philipp Dijkstal (PSI)

LEDS2023-Dijkstal_Philipp.pdf

4:10 PM Self-locked time-resolved measurements with a passive streaker

Speaker: Alexander Malyzhenkov (CERN)

LEDS2023-Malyzhenkov_Alexander.pdf

4:40 PM State-of-the-art transverse deflecting cavities

Speaker: Paolo Craievich (PSI)

LEDS2023-Craievich_Paolo.pdf

5:10 PM → 5:30 PM Q & A

7:30 PM → 10:00 PM Social dinner

Thursday, October 5

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

Speaker: Sara Thorin (MAX-IV)

LEDS2023-THORIN_SARA.pdf

9:00 AM Bunch compression for FELs – Chicanes or Arcs?

Speaker: Peter Williams (STFC Daresbury Laboratory & Cockcroft Institute)

LEDS2023-Peter_Williams.pdf

9:30 AM → 9:50 AM Q & A

9:50 AM → 10:10 AM Break

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

Speaker: Alexander Darius Brynes (Elettra-Sincrotrone Trieste)

LEDS2023-Brynes_Alexander.pdf

10:40 AM Laser heater for a multi-stage compressor superconducting FEL driver

Speaker: Philipp Amstutz (DESY)

LEDS2023-Amstutz_Philipp.pdf

11:10 AM Half-wavelength velocity bunching: non-adiabatic temporal focusing of charged particle beams

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)

LEDS2023-Perosa_Giovanni.pdf

11:40 AM → 12:00 PM Q & A

12:00 PM → 12:30 PM LEDS proposal for LEAPS: Close-out