Workshop on Longitudinal Electron beam Dynamics for coherent light Sources 2026 (LEDS 2026)

14 Apr 2026, 12:00 → 16 Apr 2026, 23:30 Europe/Zurich

Lecture Hall (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH/ BESSY II)

The third annual workshop on Longitudinal Electron beam Dynamics for coherent Sources (LEDS'26) will be run by the Helmholtz-Zentrum Berlin and the Johannes Gutenberg-Universitat Main, and it aims to collect the most recent advancements in high brightness electron accelerators. The event will focus on beam collective effects that impact beam's brightness in free-electron lasers and storage rings. We aim for an open exchange of ideas, and we will leave ample time for discussions.

The workshop will run from April 14 to April 16, 2026, in HZB, Berlin, Germany. It will be on invitation, in-person only. More information on the specific topics, the programme and organizational aspects will be provided soon on this website.

 

The scientific program is intended to cover the following topics:

1. Advancements in RF photo-injectors and optimization strategies

2. Intrabeam Scattering and Energy Spread in linac-FELs

3. Compression Schemes

4. High energy beam transport

5. Femtosecond and sub-fs FEL pulses

6. Advanced electron beam manipulation

7. Preserving coherence in Storage Ring Light Sources

8. Longitudinal manipulation in Storage Ring Light Sources

 

 

 

 

Tuesday 14 April

12:15 → 13:55 Arrival: Registration

13:55 → 16:10 Session 1: Advancements in RF photo-injectors and optimization strategies

Convener: Atoosa Meseck (HZB / JGU)

14:00 Collective and surface charge effects in high-brightness electron bunch production for FCC-ee injector

Speaker: Anahita Omoumi (CERN)

14:25 Longitudinal emittance improvement by shortening injector laser pulse duration

Speaker: Roberta Provvedi (PSI)

14:50 Beam dynamics optimization for a higher-brightness photo injector with various photocathode laser pulse shape

Speaker: Sumaira Zeeshan (DESY-PITZ)

15:15 Balance of bunch compression and emittance preservation for high-brightness X-ray FEL injectors

Speaker: Can Davut (TENMAK)

15:40 Round Table

Speaker: Atoosa Meseck (HZB / JGU)

16:10 → 16:35 Coffee Break

16:35 → 18:25 Session 2: Intrabeam Scattering and Energy Spread in linac-FELs

Convener: Erion Gjonaj (TEMF-TUDa)

16:40 Intrabeam Scattering Modelling and Benchmarking

Speaker: Paula Desiré Valdor (CERN)

17:05 Accurate modelling of intrabeam scattering and its impact on photoinjectors for FELs

Speaker: Thomas Geoffrey Lucas (PSI)

17:30 Longitudinal phase Space tomography at PITZ

Speaker: Chris Richard (DESY-PITZ)

17:55 Round Table

Speaker: Erion Gjonaj (TEMF-TUDa)

Wednesday 15 April

08:25 → 10:05 Session 3: Compression Schemes

Convener: Peter Williams (STFC)

08:30 Collective effects and beam instabilities at the EuXFEL

Speaker: Igor Zagorodnov (DESY)

08:55 Comparison of compression schemes in Soft (SXFEL) and Hard (UK-XFEL) X-ray FELs

Speaker: Adam Dixon (MAX IV)

09:20 Microbunching instability studies at FERMI in the presence of two-stage compression

Speaker: Giovanni Campri (Elettra)

09:45 Round Table

Speaker: Peter Williams (STFC)

10:05 → 10:30 Coffee Break

10:30 → 12:15 Session 4: High energy beam transport

Convener: Sara Thorin (MAX IV)

10:35 Design and optimisation of the UK-XFEL spreader lattice and bunch distribution scheme

Speaker: Andrew Potter (DLS)

11:00 Microbunching reduction in the spreader switchyard lines of FERMI

Speaker: Simone Spampinati (Elettra)

11:25 Passive streaker and longitudinal phase-space studies at the EuXFEL

Speaker: Sergey Tomin (EU-XFEL)

11:50 Round Table

Speaker: Sara Thorin (MAX IV)

12:15 → 13:55 Lunch

13:55 → 16:10 Session 5: fs and sub-fs FEL pulses

Convener: Prof. Philippe Piot (Argonne National Laboratory)

14:00 Recent results from laser-based bunch shaping at FLASH

Speaker: Philipp Amstutz (DESY)

14:25 Experimental generation of petawatt peak power electron beams via laser heater shaping at FACET-II

Speaker: Claudio Emma (SLAC)

14:50 Coherent sub-femtosecond x-ray FEL pulses with low-charge electron beams

Speaker: Eduard Prat (PSI)

15:15 Attosecond pulse generation and relevant electron beam dynamics at the EuXFEL

Speaker: Svitozar Serkez (EU-XFEL)

15:40 Round Table

Speaker: Philippe Piot (ANL)

16:10 → 16:35 Coffee Break

16:35 → 18:25 Session 6: Advanced electron beam manipulation

Convener: Paolo Craievich (PSI)

16:40 Understanding energy spread evolution through modeling of collective beam dynamics

Speaker: Giovanni Perosa (EU-XFEL)

17:05 Update on active energy compression of a laser-plasma electron beam

Speaker: Paul Winkler (DESY)

17:30 TBD

17:55 Round Table

Speaker: Paolo Craievich (PSI)

19:15 → 22:00 Dinner

Thursday 16 April

08:25 → 10:05 Session 8: Preserving coherence in Storage Ring Light Sources

Convener: Carsten Mai (HZB)

08:30 Intrabeam scattering in Simulation and Experiment

Speaker: William Bergan (BNL)

08:55 Coherent emission from microbunched beams at the Metrology Light Source

Speaker: Arnold Kruschinski (HZB)

09:20 Preservation of transverse coherence with "crab cavities" in Elettra 2.0

Speaker: Simone Di Mitri (Elettra)

09:45 Round Table

Speaker: Carsten Mai (HZB)

10:05 → 10:35 Coffee Break

10:35 → 12:15 Round Table: Longitudinal manipulation in Storage Ring Light Sources

Convener: Pol Solans (ALBA)

10:35 Semi-analytical code for Transient Beam Loading effects in harmonic RF systems and their mitigation

Speaker: Ignasi Bellafont (ALBA)

11:00 Experience with normal conducting harmonic cavities at BESSY II

Speaker: Aleksandr Matveenko (HZB)

11:25 Double- and Triple-RF systems for MAX4U and Commissioning of a 500 MHz Cavity for Bunch Lengthening using Two Higher RF Harmonics

Speaker: Murilo Barbosa Alves (MAX IV)

11:50 Round Table

Speaker: Pol Solans (ALBA)

12:15 → 14:00 Lunch

14:00 → 17:00 Visit to the MLS

Convener: Carsten Mai (HZB)