FELs of Europe 2nd Topical Workshop on Selected Problems in FEL Physics: "From Soft X-rays to THz" and Satellite Workshop "Perspectives and Future Challenges in Optical and RF Synchronization Systems"

14 Nov 2023, 08:30 → 17 Nov 2023, 14:05 Europe/Berlin

CSSB Auditorium (CSSB)

This 2nd edition of the FELs of Europe Topical Workshop on Selected Problems in FEL Physics is divided into two parts:
- the main event from Wednesday to Friday,
- a satellite meeting, focusing on the topic of advanced synchronization systems. 

 

This event is funded to a large part by FELs of Europe https://www.fels-of-europe.eu/ 
and organized this year by European XFEL GmbH and DESY.

 

Previous event 2022 : https://www.fels-of-europe.eu/e212752/e214604/e313168  
 

 

 

Presentations

• 02 Ganter.pdf
• 05 Ganter.pdf
• 06 Schaper.pdf
• 08 Qin.pdf
• 10 Hariton.pdf
• 11 Musumeci.pdf
• 15 Krasilnikov.pdf
• 16 Yan.pdf
• 17 Lehnert.pdf
• 18 Schoellkopf.pdf
• 21 Trebushinin.pdf
• 23 Chiadroni.pdf

Tuesday 14 November

08:30 Coffee

1 Welcome & Workshop Infos

intro-slides_FoE_satelliteWS.pptx

Satellite-Workshop_Zoom-Details.pdf

Satellite Workshop: Tutorials / Talks

Convener: Sebastian Schulz (DESY)

2 State-of-the-art RF Oscillators and Distribution

Speaker: Frank Ludwig (MSK (Strahlkontrollen))

FEL_RF_Synch_FL_V0_short.pdf

3 Importance of Synchronization for the Accelerator Performance

Speaker: Dr Holger Schlarb (DESY)

2023-11-14-FELofEurope_Schlarb.pdf

4 Synchronization Requirements for Future Experiments

Speaker: Stefan Duesterer (FS-FLASH-D (FLASH Photon Diagnostics and Controls))

Synchronization for future experiments.pdf

10:35 Coffee Break

Satellite Workshop: Established Large-Scale Synchronization Systems and their Main Clients

Convener: Marie Kristin Czwalinna (DESY)

5 The FERMI Optical Timing system: operating experience and latest developments

The FERMI Optical Timing system started its operations in 2009 demonstrating the high reliability of optical technologies to achieve femtosecond level performances for phase reference distribution and synchronization. After the completion of the progressive installation of the system, the main focus was on improving the operations and the uptime. At present a major upgrade on the pulsed subsystem is currently in progress to increase the number of stabilized links.

Speaker: Fabio Rossi (ELETTRA)

FabioRossi_slides_FR.pdf

6 The optical synchronization systems at European XFEL and FLASH

Speaker: Sebastian Schulz (Deutsches Elektronen-Synchrotron)

2023-11-14 The Optical Synchronisation Systems at FLASH and EuXFEL.pptx

7 The Synchronization System at SHINE

Speaker: Jinguo Wang (SARI)

A Brief Introduction to SHINE and progress in the synchronization system.pdf

12:15 Workshop Photo

12:20 Lunch

vouchers for the cantine will be handed out.

Satellite Workshop: Discussion Session I

Selected Topics on State-of-the art Techniques and Current Challenges

Convener: Bernd Steffen (MSK (Strahlkontrollen))

8 Development of a versatile arrival-time monitor for Laser-to-FEL stabilization

Speaker: Anne-Laure Calendron (DESY)

SynchronizationWorkshop_2023_ALC_Final.pptx

9 The Fermi synchronization of Seed and pump-probe Lasers: achieved performance and recent developments.

The seed laser of FERMI generates the UV pulses that seed the FEL and the IR pulses delivered to the beamlines for pump-probe experiments. The implemented tight synchronization of the local laser oscillator to the optical timing system and the stabilization of the time of flight across the regenerative amplifier secure better then 5 fs RMS jitter of the seed pulses with respect to the timing reference. In the pump-probe experiments the timing jitter is also typically better then 5fs RMS over tens of minutes.
In order to maintain the proper timing between the seed laser pulse and the electron bunch we compensate the delay of the UV pulses during the wavelength changes caused by the optical parametric amplifier timing and an additional feedback system correlates the BAMs with the FEL intensity, adjusting the seed laser arrival time in order to compensate drifts due to e-beam and UV beam transport drifts. The talk will present details on the updated optical setups, including the upgrade for implementing the EEHG scheme where 2 seed pulses delivered to different locations need to be provided.

Speaker: Paolo Sigalotti (Elettra Sincrotrone Trieste SCpA)

231114 Sigalotti 1.pptx

10 A Simulation-Based Exploration of Synchronization Challenges and Strategies for High Repetition-Rate EEHG

Speaker: Dr Pardis Niknejadi (MPY (Beschleunigerphysik))

SyncDesyNov14PN.pdf

11 Speed Talks

Plans at PolFEL

12 Time for Discussion

15:50 Coffee Break

Satellite Workshop: Discussion Session II

Selected Topics on Near Future Challenges

Convener: Anne-Laure Calendron (DESY)

13 Fermi laser synchronization: near future challenges

There are three topics that we would like to investigate to improve the laser performance at FERMI in the near future:
- A time stabilization system for the long transport of the seed laser to experimental stations aimed at cancelling the long term drift in the pump-probe experiments, might be based on LAM
- A robust BOCC to synchronize a second Ti:Sa oscillator to the main one, i.e. 2 pulses at 800nm (the current system is designed for 1500 and
800 nm), in order to decouple the optical parameters of the pulse produced for pump-probe experiments from the one required for the FEL.
- Studies aimed at better understanding of the dynamic response of the phase of a Ti:Sa oscillators versus the voltage applied to the piezo actuator, in order to improve the frequency response of the control loop and the quality of the locking

Speaker: Paolo Sigalotti (Elettra Sincrotrone Trieste SCpA)

231114 Sigalotti 2.pptx

14 State-of-the-art LLRF Systems and Future Perspectives at DESY

Speaker: Julien Branlard (MSK (Strahlkontrollen))

2023_11_14 - J.Branlard - LLRF systems.pptx

15 Beam-based Feedbacks for CW Machines

Speaker: Andrei Maalberg (Helmholtz-Zentrum Dresden-Rossendorf)

20231114_maalberg_slides.pdf

16 Time for Discussion

Wrap Up / Closing Remarks

18:00 Satellite Workshop Dinner

Fingerfood (incl. vegan options) will be offered,
along with drinks (incl. beer and wine)

Wednesday 15 November

Guided Tours: main event

Guided tour through FLASH2 tunnel and FLASH experimental halls ("Albert-Einstein" and "Kai Siegbahn") with photon beamlines and experimental end-stations.

You find details in the attached pdf.

Information-Guided-Tour2.pdf

17 Group 1

09:00 meeting at bld. 28c, FEL hall seminar room
09:10 tour through FLASH 2 tunnel
09:40 tour through FLASH 2 experimental hall
10:10 overview of FLASH 1 experimental hall
10:20 end of tour

Speaker: Marion Kuhlmann (FS-FLASH-O (FLASH Scientific User Operation))

18 Group 2

09:10 meeting at bld. 28c, FEL hall seminar room
09:20 tour through FLASH 2 experimental hall
09:50 overview of FLASH 1 experimental hall
10:10 tour through FLASH 2 tunnel
10:30 end of tour

Speaker: Bernd Steffen (MSK (Strahlkontrollen))

19 Group 3

09:20 meeting at bld. 28c, FEL hall seminar room
09:30 tour through FLASH 2 tunnel
10:00 overview of FLASH 1 experimental hall
10:10 tour through FLASH 2 experimental hall
10:40 end of tour

Speaker: Marie Kristin Czwalinna (DESY, MSK)

20 Registration

21 Welcome and Introduction

Speaker: Gianluca Geloni (European XFEl GmbH)

Soft X-rays - Electron beam dynamics

Conveners: Marc Guetg (MXL (XFEL)), Mikhail Krasilnikov (DESY Zeuthen)

22 Recent advancements in measurement of slice energy spread at EU-XFEL

Speaker: Stuart Walker (MXL (XFEL))

23 Dynamics of eSASE spikes in undulators

Speaker: Romain Ganter (PSI)

24 Laser heater commissioning at FLASH

Speaker: Philipp Amstutz (MFL (FLASH))

25 Discussion

Soft X-rays - FEL schemes: theory

Conveners: Evgeny Schneidmiller (MPY (Beschleunigerphysik)), Dr Francesca Curbis (Dep. of Physics & MAX IV laboratory, Lund University)

26 FERMI FEL2-upgrade with EEHG+HGHG scheme

Speaker: Carlo Spezzani (ELETTRA)

27 EEHG seeding scheme at SwissFEL Athos FEL

Speaker: Romain Ganter (PSI)

28 FLASH2020+: seeding at high rep. rate

Speaker: Eugenio Ferrari (MPY (Beschleunigerphysik))

29 Discussion

16:30 Coffee Break

Structured light and beam manipulation

Conveners: Gianluca Geloni (European XFEl GmbH), Marc Guetg (MXL (XFEL))

30 Schemes for generating pulses with orbital angular momentum at the European XFEL

Speaker: Jiawei Yan (Eur.XFEL (European XFEL))

31 Fresh Slice with Dechirper

Speaker: Weilun Qin (MXL (XFEL))

FELsOfEurope2023_Hamburg_WeilunQin.pptx

32 Discussion

Thursday 16 November

Soft X-ray and THz schemes

Conveners: Evgeny Schneidmiller (MPY (Beschleunigerphysik)), Manfred Helm (HZDR)

33 Short period, high field undulator developments

Speaker: Marie Emmanuelle Couprie

34 The ASPECT project at the European XFEL

Speaker: Victor Hariton (FS-LA (Extreme Nonlinear Optics))

35 Strongly tapered undulators for THz generation

Speaker: Pietro Musumeci (UCLA)

36 The Superradiant THz generation at XFEL (STERN) project at the European XFEL

Speaker: Francois Lemery (DESY)

37 Discussion

10:35 Coffee Break

FEL applications – I

Conveners: Dr Francesca Curbis (Dep. of Physics & MAX IV laboratory, Lund University), Gianluca Geloni (European XFEl GmbH)

38 Time-resolved chiral x-ray photoelectron spectroscopy with transiently enhanced atomic site-selectivity: A free electron laser investigation of electronically excited fenchone enantiomers

Speaker: Caterina Vozzi (Politecnico Milano)

39 Challenges and users’ wishes for coherent control experiments

Speakers: Dr Carlo Callegari (Elettra - Sincrotrone Trieste), Kevin Prince (Elettra Sincrotrone Trieste)

40 Discussion

41 Workshop Photo

12:30 Lunch Break

THz FEL schemes

Conveners: Manfred Helm (HZDR), Marie Kristin Czwalinna (DESY, MSK)

42 The THz FEL at PITZ

Speaker: Mikhail Krasilnikov (DESY Zeuthen)

43 Widely tunable electron bunch trains for the generation of high-power narrowband 1–10 THz radiation

Speaker: Lixin Yan (Tsinghua University, Bejiing)

44 FEL physics of the planned THz facility DALI

Speaker: Ulf Lehnert (Helmholtz-Zentrum DResden-Rossendorf)

45 The 2-Color Upgrade of the IR/THz FEL at the Fritz Haber Institute

Speaker: Wieland Schöllkopf (FHI)

46 Discussion

15:35 Coffee Break

Soft X-rays - FEL schemes: experiments

Conveners: Gianluca Geloni (European XFEl GmbH), Serguei Molodtsov (Eur.XFEL (European XFEL))

47 FERMI FEL1 upgraded to user-oriented EEHG: commissioning and lessons learned

Speaker: Carlo Spezzani (ELETTRA)

48 First operation of EEHG at FLASH

Speaker: Eugenio Ferrari (MPY (Beschleunigerphysik))

49 Attosecond at harmonics experiments at the European XFEL (also including more in general short pulse production at SASE3)

Speaker: Andrei Trebushinin (Eur.XFEL (European XFEL))

50 Discussion

18:00 Dinner

Friday 17 November

Diagnostics

Conveners: Marie Kristin Czwalinna (DESY, MSK), Mikhail Krasilnikov (DESY Zeuthen)

51 A Versatile THz Source from High-Brightness Electron Beams: Generation and Characterization

Speaker: Enrica Chiadroni (INFN - LNF)

Chiadroni_FoEWorkshop_20231117_v1.pdf

52 Photon temporal diagnostics at the European XFEL

Speaker: Jia Liu (Eur.XFEL (European XFEL))

53 Discussion

10:10 Coffee Break

FEL Applications – II

Conveners: Dr Francesca Curbis (Dep. of Physics & MAX IV laboratory, Lund University), Serguei Molodtsov (Eur.XFEL (European XFEL))

54 Two-color (NIR/X-ray and X-ray/X-ray) experiments at the Small Quantum Systems (SQS) scientific instrument

Speaker: Michael Meyer (Eur.XFEL (European XFEL))

55 Photochemical Ring-Opening Reaction of 1,3-Cyclohexadiene: Identifying the True Reactive State

Speaker: Dr Carlo Callegari (Elettra - Sincrotrone Trieste)

56 Discussion

Wrap Up and Closing Remarks

11:55 Lunch

Lunch boxes as take-away will be offered.