SwissFEL Workshop

Name: SwissFEL Workshop
Start: 2015-05-19T08:00:00+02:00
End: 2015-05-20T18:00:00+02:00
Location: Paul Scherrer Institut

19 May 2015, 08:00 → 20 May 2015, 18:00 Europe/Zurich

Paul Scherrer Institut

5232 Villigen PSI Switzerland

Participants

26 View full list

Tuesday 19 May
- Tue 19 May
- Wed 20 May
- 09:00 → 09:05
  
  Workshop information: 19.05.2015 - Non-linear experiments with hard X-rays at SwissFEL 5m
  
  Speaker: Bill Francesco Pedrini (Paul Scherrer Institut)
  
  Slides
- 09:05 → 09:20
  
  Overview SwissFEL hard X-ray experimental stations (ES-A, ES-B, ES-C) 15m
  
  Speaker: Bill Francesco Pedrini (Paul Scherrer Institut)
  
  Slides
- 09:20 → 09:55
  
  SwissFEL operation modes (+ Discussion) 35m
  
  Speaker: Sven Reiche (Paul Scherrer Institut)
  
  Slides
- 09:55 → 10:35
  
  X-ray nonlinear processes in solid Fe with hard X-ray free-electron laser pulses (+ Discussion) 40m
  
  Nonlinear interaction of solid Fe with intense femtosecond hard x-ray free-electron laser (XFEL) pulses will be reported. The experiment was performed at the CXI end-station of the Linac Coherent Light Source (LCLS) by means of high-resolution x-ray emission spectroscopy. Extreme fluences reaching ~10^5 photons/Å^2 allowed for x-ray nonlinear two-photon absorption. Double-K-hole formation via sequential two-photon absorption, and the direct two-photon absorption leading to single K-shell ionization was observed. The cross-sections for the nonlinear x-ray photon absorption processes were derived from the x-ray fluence dependence of the measured x-ray emission rates. I will present the obtained results as well as the different aspects of the experimental setup, the beam parameters and diagnostic in view of future needs.
  
  Speaker: Dr Joanna Hoszowska (University of Fribourg, Department of Physics)
- 10:35 → 11:05
  
  Coffee break 30m
- 11:05 → 11:50
  
  X-ray nonlinear absorption and emission processes (+ Discussion) 45m
  
  I will present our recent results on nonlinear absorption and emission processes obtained at SACLA. As for the absorption, I will present two-photon absorption experiment and discuss requirements to perform X-ray two-photon absorption spectroscopy. In the emission process, I will show that the fluorescence decay channel is controllable with intense X-rays, and discuss the theoretical background. Finally, I will explain our requests for the XFEL beam to perform more advanced X-ray nonlinear experiments.
  
  Speaker: Dr Kenji Tamasaku (RIKEN SPring-8 Center)
- 11:50 → 12:35
  
  Nonlinear X-Ray Wave-Mixing (+ Discussion) 45m
  
  I will describe recently performed experiments demonstrating nonlinear x-ray wave-mixing including x-ray and visible wave mixing [1], x-ray second harmonic generation [2], and x-ray parametric down-conversion [3]. I will present theoretical studies of difference-frequency generation of optical radiation from two-color x-ray pulses [4], and x-ray-pulse characterization by spectral shearing interferometry [5]. I will discuss future directions of exploring nonlinear and quantum effects in the x-ray regime. For example, x-ray parametric down-conversion may be developed into a very powerful method to study fundamental effects in quantum optics. X-ray and visible mixing may lead to atomic scale resolution techniques to study chemical bonds. Nonlinear techniques are expected to be useful in the inspection of sub-femtosecond temporal pulses. [1] T. E. Glover et al., Nature 488, 603 (2012). [2] S. Shwartz et al. Phy. Rev. Lett. 112, 163901 (2014). [3] S. Shwartz et al. Phy. Rev. Lett. 109, 013602 (2012). [4] E. Shwartz and S. Shwartz, Opt. Exp. 23, 7471 (2015) [5] S. Yudovich and S. Shwartz, Phys. Rev. A 90, 033805 (2014).
  
  Speaker: Dr Sharon Shwartz (Bar Ilan University)
- 12:35 → 13:45
  
  Lunch break 1h 10m
- 13:45 → 14:30
  
  Implications of Stimulated Resonant X-ray Scattering for Spectroscopy with X-Rays (+ Discussion) 45m
  
  Speaker: Prof. Alexander Foehlisch (Helmholtz-Zentrum Berlin)
- 14:30 → 15:15
  
  Stimulated electronic x-ray Raman scattering and perspectives for nonlinear optical spectroscopy at XFELs (+ Discussion) 45m
  
  Speaker: Dr Nina Rohringer (Max Planck Institute for the structure and dynamics of matter)
- 15:15 → 15:45
  
  Coffee break 30m
- 15:45 → 16:05
  
  Non-linear experiments with soft X-rays at the SwissFEL 20m
- 16:05 → 17:00
  
  Further discussions / Conclusions 55m
- 18:30 → 21:30
  
  Invited dinner for speakers 3h Schloss Boettstein
  
  Schloss Boettstein
  
  Boettstein
Wednesday 20 May
- Tue 19 May
- Wed 20 May
- 09:00 → 09:05
  
  Workshop information: 20.05.2015 - Nanoscale Material Science at SwissFEL 5m
  
  Speaker: Bill Francesco Pedrini (Paul Scherrer Institut)
- 09:05 → 09:20
  
  Overview SwissFEL hard X-ray experimental stations (ES-A, ES-B, ES-C) 15m
  
  Speaker: Bill Francesco Pedrini (Paul Scherrer Institut)
  
  Slides
- 09:20 → 10:30
  
  Participant contributions 1h 10m
- 10:30 → 11:00
  
  Coffe break 30m
- 11:00 → 12:30
  
  Participant contributions / Discussions 1h 30m
- 12:30 → 13:30
  
  Lunch break 1h
- 13:30 → 15:30
  
  Participant contributions / Discussions 2h
- 15:30 → 16:00
  
  Coffee break 30m
- 16:00 → 17:00
  
  Conclusion 1h

SwissFEL Workshop

Paul Scherrer Institut

Schloss Boettstein