Würzburg 2018 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 1: Particle Sources and Electron Accelerators
AKBP 1.8: Vortrag
Montag, 19. März 2018, 17:45–18:00, NW-Bau - HS4
Conceptual Design and Simulation Studies of an Electron Source for Ultrafast Electron Diffraction at DELTA — •Daniel Krieg1, Shaukat Khan1, and Klaus Sokolowski-Tinten2 — 1Center for Synchrotron Radiation, TU Dortmund University, Dortmund, Germany — 2University Duisburg-Essen, Duisburg, Germany
Ultrafast electron diffraction (UED) is a technique to study the structural dynamics of matter, combining a femtosecond time resolution with the diffraction of electrons with sub-angstrom De-Broglie wavelength. The method is an alternative approach to X-ray scattering at free-electron lasers. UED pump-probe experiments require ultrashort laser pulses to pump a sample, electron bunches with small emittance and ultrashort length, typically with charges well below 1 pC, to analyze the state of the sample by diffraction, and an excellent control of the delay between laser and electron bunch. Most UED setups use electrostatic electron sources in the keV regime but electrons accelerated to a few MeV in a radiofrequency photocathode gun offer significant advantages concerning bunch length and emittance due to the reduction of space charge effects. Furthermore, the longer mean free path of MeV electrons allows for thicker samples and therefore a wider range of possible materials. In this talk, a first conceptual design and simulation results for a university-based UED facility with ultrashort and low-emittance MeV electron bunches are presented.