München 2019 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 9: Electron Accelerators
AKBP 9.6: Vortrag
Dienstag, 19. März 2019, 17:45–18:00, HS 7
Focussing Schemes for an Electron ource for Ultrafast Electron Diffraction at DELTA — •Daniel Krieg1, Shaukat Khan1, Klaus Sokolowski-Tinten2, and Thies Johannes Albert2 — 1Zentrum für Synchrotronstrahlung, TU Dortmund, Dortmund,Deutschland — 2Universität Duisburg-Essen, Duisburg, Deutschland
Ultrafast electron diffraction (UED) is a pump-probe technique to explore the structural dynamics of matter, combining sub-angstrom De-Broglie wavelength of electrons with femtosecond time resolution. UED experiments require ultrashort laser pulses to pump a sample, electron bunches with small emittance and ultrashort length to analyze the state of the sample and excellent control of the delay between them. Electrons accelerated to a few MeV in photocathode gun offer significant advantages compared to keV electrons from electrostatic electron sources, regarding emittance, bunch length and bunch charge. Furthermore, the longer mean free path of MeV electrons allows for a wider range of possible materials. In this talk, longitudinal and transverse focussing schemes, which minimize space charge effects and nonlinearities, are presented for a university-based UED facility with ultrashort and low-emittance MeV electron bunches are presented. The requirements for the laser system and the radiofrequency incoupling will be discussed.