van der Meer, A. F.G.

Paper	Title	Page
MOAAU04	First Lasing of FELICE
	A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein
	After a short description of the new beam line FELICE for intra-cavity experiments at the FELIX facility, first measurements of the laser characteristics after the observation of first lasing on 11 August, will be presented.
	Slides
WEBAU04	Single-Shot Longitudinal Bunch Profile Measurements at FLASH Using Electro-Optic Detection: Experiment, Simulation, and Validation	310
	V. R. Arsov, E.-A. Knabbe, B. Schmidt, P. Schmüser, B. Steffen DESY, Hamburg G. Berden, A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein W. A. Gillespie, P. J. Phillips University of Dundee, Nethergate, Dundee, Scotland S. P. Jamison STFC/DL/ASTeC, Daresbury, Warrington, Cheshire A. MacLeod UAD, Dundee
	At the superconducting linac of FLASH at DESY, we have installed an electro-optic experiment for single shot, non-destructive measurements of the longitudinal electric charge distribution of individual electron bunches. The profile of the electric bunch field is electro-optically encoded onto a stretched Ti:Sa laser pulse. In the decoding step, the profile is retrieved from a cross-correlation of the encoded pulse with a 35 fs laser pulse, obtained from the same laser. At FLASH, sub-100 fs electron bunches have been measured during FEL operation with a resolution of better than 50 fs. The electro-optic encoding process in gallium phosphide as well as the decoding step in a frequency doubling BBO crystal were numerically simulated using bunch shapes simultaneously measured with a transverse-deflecting rf structure as input data. In this contribution, we present electro-optically measured profiles and compare them with the simulation.
	Slides
WEPPH059	FELICE: the Free Electron Laser for Intra-cavity Experiments
	B. Redlich, A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein
	In this poster presentation we will discuss the objectives of the FELICE project, its design and construction, as well as the results of the recent commissioning phase.
THBAU02	FELICE, the Free Electron Laser for Intra-Cavity Eperiments
	B. Redlich, A. F.G. van der Meer FOM Rijnhuizen, Nieuwegein
	We present the status and first results of the commissioning of the new beam line FELICE, an extension of the IR User Facility FELIX. The primary purpose of this beam line is to enhance the capabilities of the facility for different types of action spectroscopy of (bio)molecules, ions, clusters and complexes in the gas-phase. FELs such as FELIX are particularly suited for this type of research and the majority of the beam time delivered is nowadays devoted to it. Despite the large number of successful experiments, it soon became clear that for certain experiments even the output of FELIX is not sufficient, especially in the FIR. As the absorption cross sections of the gas samples are inherently low, a very significant boost is possible by making use of the intra-cavity power. FELICE is designed to cover the wavelength range from 3 to 100 microns at a micropulse repetition rate of 1 GHz. It runs interleaved with FELIX at a macropulse repetition rate of up to 10 Hz. The 4-mirror resonator, extending through the radiation shielding, provides an additional focus at either one of two experimental setups: a versatile molecular beam machine and an FTICR ion trap. For the wavelength range above 35 microns, the resonator will be equipped with an insertable, partial waveguide. At this moment, an intermediate stage has been reached in which FELICE can operate in the 6–35 micron range.
	Slides