Abstract

FELICITA II (free electron laser in a circular test accelerator) is the second FEL experiment planned at DELTA, the storage ring facility at the University of Dortmund, following a more conventional experiment in the visible and near UV [1]. It is designed to operate in the wavelength regime of 100 nm and considerably below. Due to the high losses of the optical cavity FELICITA II has to provide extremely high gain. This paper presents a design study of this FEL, giving preliminary parameters for the undulator, the ring resonator and the installation into the storage ring. Furthermore, simulation results concerning gain, susceptibility to energy spread and emittance, and the operation of FELICITA II in DELTA will be presented.

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