Experimental results with a novel superconductive in-vacuum mini-undulator test device at the Mainz Microtron MAMI

Experimental results of beam tests with a novel superconductive in-vacuum mini-undulator test device are described. The period length is 3.8 mm and the undulator is 100 periods long. The gap height can be varied between 1 and 2 mm. The tests were performed with an 855 MeV electron beam at the Mainz Microtron MAMI. The small gap undulator has been operated up to an electron beam current of 50 /spl mu/A cw. The bremsstrahlung background is almost negligible and the beam does not influence the in-vacuum superconductor. In this paper the measured X-ray spectra are presented.