TTF FEL Results Jacek Krzywinski TTF FEL Performance FEL Physics Experiments FELIS (Free Electron Laser - Interaction with Solids Cluster Experiment

Transcription

1 TTF FEL Results Jacek Krzywinski TTF FEL Performance FEL Physics Experiments FELIS (Free Electron Laser - Interaction with Solids Cluster Experiment

2 TTF FEL Performance Photon Beam Diagnostic Team Scientists: Josef Feldhaus Christofer Gerth Ulrich Hahn Rasmus Ischebeck Barbara Steeg Kai Tiedke Rolf Treush Engineers and Technicians: Lutz Bittner Thorsten Hans Mathias Hesse Fini Jastrow Michael Meschkat Ernst Weiner

3 Demonstration of: Saturation: from nm Tranverse coherence > 90% Diffraction patterns from double and crossed slits Variation of pulse length: fs variation via bunch compressor 1 Second harmonics spectra: wavelength 48.5 nm

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8 FELIS (Free Electron Laser-Interaction with Solids) J. Krzywinski 1,2, A. Andrejczuk 1,3, U. Hahn 2, M. Kirm 4, A. Kauch 5, M. Jurek 1,2, J.B. Pelka 1, H. Reniewicz 3,W. Sobala 6, M. Sikora 7, R. Sobierajski 2,8 1 Institute of Physics, Polish Academy of Sciences, 2 HASYLAB at DESY, Germany, 3 University of Bialystok, Poland, 4 Institut Für Eksperimentalphysik der Hamburg Universität 5 Warsaw University,Poland 6 Institute of Nuclear Physics, Cracow,Poland 7 University of Mining and Metallurgy 8 Warsaw University of Technology, Cracow, Poland

9 Experimental layout VUV laser beam TOF VUV Detectors Light source CCD Camera X,Y,Z,ϕ sample manipulator Photocurrent A Evaporation cell

10 Experimental layout

11 VUV beam parameters Pulse length fs Pulse energy 1-30 uj Wavelength nm Minimum spot size 10 µm

12 Experimental results Example of ablation detected by TOF spectrometer (Si sample) H Si TOF signal [V] 0 O Time [µs]

13 Experimental results Si + ion emission threshold Normalized inte gral of MCP signal [a.u.] Beam intensity [a.u.]

14 Si =2.5mm Number of pulses max = 2.5uJ mean = 1.2uJ Npulses = Pulse energy [uj]

15 Number of pulses max = 5.1uJ mean = 1.3uJ Npulses = Pulse energy [uj] Si =1mm

16 Number of pulses max = 3.4uJ mean = 1uJ Npulses = Pulse energy [uj] =0mm Si

17 Si

18 Cluster emission from graphite surface 3C + 4C + Graphite hv = 10.1 ev fluence ~0.1 J/cm^2 5C + 7C + C + 6C + 8C + 9C + 10C + 11C + 12C + 14C + 15C +

19 Cluster emission from MgF 2 surface

20 Surface modification AFM results V. Kuestner, S. Jacobi, GKSS

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22 C-film (10nm) / Si-substrate

23 C-film (10nm) / Si-substrate

24 C-film (10nm) / Si-substrate

25 C-film (40-nm) / Si-substrate

26 Plasma creation multiple ionisation maximum kinetic energy > 10 kev (C 5+ ) non thermal ion energy distribution

27 Number of pulses max = 5.4uJ mean = 1.6uJ Npulses = Pulse energy [uj] =0mm

28 FELIS Jan. 2002

29 plasma results Au bulk scan _/t0 /set mass/charge scale /versus/ Integ. of I0mcp-sc[V*s][] scan _/t0 /set mass/charge scale /versus/ Max of I0 peak[v][] 0.1 TOF -scan _026.dat /cond._2/t TOF -scan _037.dat /cond._2/t Voltage [V] HPF=100 V Au 3+ Au Au Au Voltage [V] HPF=200V Au 3+ Au Mass/charge [amu/e] Mass/charge [amu/e] scan _/t0 /set mass/charge scale /versus/ Max of I0 peak[v][] scan _/t0 /set mass/charge scale /versus/ Max of I0 peak[v][] TOF -scan _037.dat /cond._2/t0 TOF -scan _023.dat /cond._2/t Au 2+ HPF=200V 0.03 Au 3+ Au + Au 2+ Au Au 3+ HPF=800V 0.04 Voltage [V] Voltage [V] Mass/charge [amu/e] Mass/charge [amu/e]

30 First Results from the Clusterexperiment at the TTF-FEL Motivation Experimental Set-Up Multi-Photon Ionisation Coulomb Explosion of Clusters

31 Peter Gürtler Wiebke Laasch Tim Laarmann Joachim Schulz Anja Swiderski Klaus von Haeften Hubertus Wabnitz Thomas Möller

32 Idea of the experiment interaction of intense soft x-rays with matter which multi-photon processes are observed cross sections (surface, bulk) which ions are prepared (charge state, electronically excited states) life time of intermediate states high-order harmonic generation

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35 0,4 single shot Xe ++ Xe + Xe 3+ intensity [arb. units] 0, average size of clusters N= , time of flight [ns]

36 atomic beam 0,3 intensity [arb. units] 0,2 0,1 Xe + 0, time of flight [ns]

37 ejection energy Xe + 0,3 intensity [arb. units] 0,2 0,1 4+ Xe ++ average size of clusters N=20 Xe 3+ Xe 2 + 0, time of flight [ns]

38 cluster beam 0,3 Xe ++ Xe + intensity [arb. units] 0,2 0, Xe 3+ average size of clusters N=2000 0, time of flight [ns]

39 N~30000 Dependence on the cluster size N~80 Single photon absorption in Xe atoms 0.2 intensity [arb. units] N~2-20 Xe Xe ++ emission of highly charge ions from clusters ( up to eight times charges) ions have high kinetic energy atom Xe time of flight [ns]

40 Kinetic energy of the ejected ions xenon clusters N=2000 Quadratic dependence on charge ejection energy [ev] Coulomb explosion ion charge state

41 Dependence on the power density Xenon clusters, 50 atoms Watt/cm 2 5*10 11 Watt/cm

42 Conclusions: all features of FEL SASE radiation has been demonstrated in the nm range : saturation, tunability, coherence, higher harmonics (in addition pulse length control in the fs range) two user experiments has been successfully carried out providing unique data of intense soft X-ray - matter interaction in the new domain of parameters results of the experiments are essential for planning future experiments at soft X-ray FELs