Conceptual and experimental feasibility study of a superconductive micro-undulator

Generating synchrotron radiation from conventional undulators in the hard X-ray region requires high electron energies. In order to open this spectral region for sources with smaller electron energy, such as ANKA (2.5 GeV), the period length of the undulator has to be decreased. In this paper the concept and the first successful tests towards constructing a superconductive micro-undulator with a period length of 3.8 mm are described. The structures were built with a commercially available NbTi wire. It was possible to run about 1000 Ampere through the undulator coil at 4 K. A full prototype of a superconductive undulator is now under construction.