Abstract
A hybrid (superconducting + soft iron poles and yoke) short model of a helical undulator was designed, built andsuccessfully tested. The parameters of the model were chosen close to the requirements forfree electron laser undulators: 10 mm diameter clear bore, 28 mm period, 0.95 T design field.The number of full periods is 6. A NbTi composite multifilamentary strip was used in thewinding. During the tests the central magnetic field reached 1.065 T at 1215 A operatingcurrent. As far as we are aware, the combination obtained of bore-to-period ratio andmagnetic field strength can be considered one of the best achieved practically for helicalundulators.
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