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Diagnosis of a High Harmonic Beam Using COLTRIMS

Kansas State University Department of Physics. Diagnosis of a High Harmonic Beam Using COLTRIMS. Predrag Ranitovi ć. April 2005. Outline. 1. Motivation. Time resolved photoelectron spectroscopy. Development of an apparatus for performing pump-probe experiments.

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Diagnosis of a High Harmonic Beam Using COLTRIMS

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  1. Kansas State University Department of Physics Diagnosis of a High Harmonic Beam Using COLTRIMS Predrag Ranitović April 2005

  2. Outline 1. Motivation Time resolved photoelectron spectroscopy Development of an apparatus for performing pump-probe experiments

  3. Generation and Characterization of a High Harmonic Beam 1. Pump and Probe Arrangement using Visible-Pump and an x-ray as a probe pulse 2. Development of an apparatus for performing pump-probe experiments

  4. Outline 1. Motivation Time resolved photoelectron spectroscopy Development of an apparatus for performing pump-probe experiments Development of an apparatus for performing pump-probe experiments Generation and Characterization of a High Harmonic Beam 2. Summary and Outlook

  5. Spectrometer Aluminum filter High Harmonic Generation gas cell f=30 cm Experimental Setup

  6. + High Harmonic Generation

  7. + High Harmonic Generation

  8. + High Harmonic Generation Gas Tube Argon gas as a harmonic generation medium Harmonics’ intensity varies with the lasers’ focusing point Al filter Aluminum absorber  = 800 nm   40 fs,

  9. High Harmonic Generation Aluminum absorber

  10. High Harmonic Generation Spectrometer Aluminum filter

  11. COLTRIMS

  12. COLTRIMS – Momentum Imaging Technique Mono energetic electron with the momentum along the spectrometer electric field

  13. + Ar time of flight and detector image y [mm/2] t [ns] x [mm/2]

  14. Electron time of flight and detector image B = 12 Gauss y [mm/2] t [ns] x [mm/2]

  15. Electron time of flight and detector image Electron time of flight and detector image B = 8 Gauss y [mm/2] t [ns] x [mm/2]

  16. Electron time of flight and detector image Electron time of flight and detector image B = 6 Gauss y [mm/2] t [ns] x [mm/2]

  17. The Wiggles r [mm/2] r [m] t [ns] t [s] T=357.4/B [ns]

  18. Momentum Imaging P y P [a.u.] P [a.u.] x z

  19. Momentum Imaging B = 6 Gauss P P x y P [a.u.] P [a.u.] z z

  20. Momentum Imaging B = 8 Gauss P x P [a.u.] t [ns] z

  21. Photoelectron energies = E [eV]

  22. Photoelectron energies P x P [a.u.] z E [eV]

  23. Summary and Outlook X-ray Angular Divergence Photon flux Harmonic Orders

  24. The Wiggles

  25. Old Data

  26. + + Ar time of flight and detector image Ar time of flight and detector image This is a E  40 V/cm run, the recoil detector is still 22 cm from the interaction region

  27. Electron time of flight and detector image This is a E = 2.4 V/cm and B = 10 Gauss run, the electron detector is 5.3 cm from the interaction region

  28. Photoelectron energy (eV) Those five peaks correspond to 13th, 15th, 17th, 19th and 21st harmonic in a field free arrangement

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