Abstract

Only since few years it has been demonstrated experimentally that NbTi based superconducting undulators (SCUs) have a higher peak field on axis for the same gap and period length in operation with electron beam with respect to permanent magnet undulators (even the ones in vacuum and cooled to cryogenic temperatures). Another advantage of NbTi based SCUs with respect to permanent magnet devices is radiation hardness, widely demonstrated for NbTi magnets, which is and will become an increasingly important issue with the small gaps in the newest machines as round beam storage rings and FELs. Moreover, SCU technology allows switching of the period length by changing the current direction in one of separately powered subset of winding packages of the superconducting coils. This feature further broadens the energy range of the emitted photons, required by the different beamlines. To this end a 0.41 m long superconducting undulator coil with switchable period length between 17 mm and 34 mm has been developed. In this contribution we describe the design and report on the quench tests, as well as on the magnetic field measurementsThe first section in your paper.

Highlights

  • Technical working concepts for superconducting undu-lators have been explored in the past [1]

  • This feature further broadens the energy range of the emitted photons, required by the different beamlines. To this end a 0.41 m long superconducting undulator coil with switchable period length between 17 mm and 34 mm has been developed. In this contribution we describe the design and report on the quench tests, as well as on the magnetic field measurementsThe first section in your paper

  • The Institute for Beam Physics and Technology (IBPT) at Karlsruhe Institute of Technology (KIT) is the institute within the Helmholtz Association which has driven the development of superconducting undulators in close cooperation with its industrial partner Bilfinger Noell during the past ten years

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Summary

Introduction

Technical working concepts for superconducting undu-lators have been explored in the past [1]. The partners have developed and successfully tested a superconducting undulator with 20 mm period length with electron beam at the KIT synchrotron. This is the first commercially available product worldwide: a robust device, with reasonable delivery time, easy handling during installation and operation [4]. Superconducting undulator technology allows a more elegant solution using the same magnetic structure to switch the period length. This is performed by changing the current direction in one of separately powered subset of winding packages of the superconducting coils (see Fig. 1).

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