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T: Fachverband Teilchenphysik

T 79: Beschleunigerphysik 2

T 79.1: Vortrag

Dienstag, 10. März 2009, 16:45–17:00, A213

Beam Optimization at the FELBE User Facility — •Matthias Justus — Forschungszentrum Dresden-Rossendorf, Institut für Strahlenphysik, PF 510119, 01314 Dresden

The radiation source ELBE at the Research Centre Dresden-Rossendorf (FZD) delivers coherent high brightness infrared light for spectroscopy and microscopy in materials and biochemical research since 2004. Two FELs driven by a high current electron beam cover the MIR and FIR range from 3 to 230 micrometers. Information on the electron LINAC, the technical implementation of the FELs and selected experimental work within the FELBE program is given.

For FELBE users, stringent beam quality measures may play a role in time domains from milliseconds to hours and define requirements on the electron beam. Any beam optimization stabilization system has therefore to cover a broad spectrum of machine settings in terms of overall IR light power, wavelength and temporal structure. The electron beam energy is stabilized by a spectrometric feedback to prevent the IR beam from wavelength drifts. Further, the IR light power is permanently measured from backscattered light and stabilized by adjusting the electron beam current up to the 10 Hz range. The detector setup is explained and control loop design aspects are covered as well.