High performance short-period undulators using high temperature superconductor tapes

Superconducting undulators are currently under development at a number of light sources to serve as the next generation of insertion devices, with higher fields providing enhanced spectral range for users. Most of these devices are designed with wire-based technologies appropriate for periods greater than 10mm. New undulator concepts yielding very short-period, high-field devices with periods of a few millimeters and a K ∼ 1 have the potential to significantly reduce the cost and enhance the performance of FEL’s. Here we describe a design using high temperature superconductor tapes that are commercially avail able, and that promise a cost-effective fabrication proces s using micromachining or lithography.