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T: Fachverband Teilchenphysik
T 70: Beschleunigerphysik II
T 70.3: Vortrag
Donnerstag, 6. März 2008, 17:15–17:30, KGI-HS 1019
Bunch diagnostics with coherent infrared undulator radiation — •Arik Willner1, Jörg Rossbach1, Oliver Grimm1, Hossein Delsim-Hashemi1, Ulrike Frühling1, Bernhard Schmidt2, and Michael Gensch2 — 1Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2DESY, Notkestr. 85, 22607 Hamburg, Germany
The Free-Electron-Laser in Hamburg (FLASH) at DESY has been complemented by an electromagnetic infrared undulator as a new tool for analysing the longitudinal profile of the short electron bunches characteristical for FLASH using coherent diagnostic techniques. This undulator has a maximum K-Value of 44 corresponding to a maximum wavelength of 200μm at an electron energy of 500 MeV. For the characterization of the emitted radiation and for the analysis of correlations between machine and undulator parameters an experimental set-up is installed in the FLASH Experimental Hall containing a dispersive spectrometer as main instrument. The spectrometer is designed for THz spectra using reflective blazed gratings as dispersive elements and a pyro-electrical detector. In addition, intensity measurements are made 10m behind the undulator in the tunnel. The far goal is the reconstruction of the longitudinal bunch shape just by tuning the undulator through the wavelength range and measuring the intensity of the out coming infrared light. This talk will give an overview of the spectrometer-design, the necessary preparative optics and of first results concerning correlation measurements with both settings in the tunnel and in the experimental hall.