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The multipole superconducting wiggler was designed, fabricated and successfully installed and tested on DELTA Synchrotron Radiation Source. The wiggler represents a multipole magnet with alternating high magnetic field of 7 Tesla along movement of particles in storage ring. The magnet is immersed into liquid helium of a special cryostat with working temperature of ~4.2K. The wiggler consists of 22 pairs of poles superconducting magnet with 18 full field poles, 2 with a three-quarter field strength and 2 with one-quarter field poles. The magnet array produces a sin-like magnetic field variation on the magnetic axis of the device with first and second field integrals close to zero. The Dortmund Electron Accelerator (DELTA, Germany) operated at 1.5 GeV synchrotron radiation source requires a superconducting wiggler as an insertion device for three x-ray beamlines with photon energies up to more than 30 keV. The wiggler has a period of 127 mm, magnetic field of 7 Tesla and the length from flange to flange of 2.2 m operated with zero boil-off mode. The conception and main approaches for the design of the magnetic and cryogenic system as well as the main parameters and the test results of new 7 Tesla superconducting wiggler for DELTA synchrotron light source are presented., Proceedings of the 26th Russian Particle Accelerator Conf., RUPAC2018, Protvino, Russia

The installation of superconducting insertion device on storage ring gives an opportunity to increase the photon flux in the required range of synchrotron radiation spectrum and shift the photon spectrum to hard X-ray region. During more than 30 years BINP developed the superconducting insertion devices for generation of synchrotron radiation. More than 20 superconducting wigglers which were produced by BINP are used on many storage rings around the world. Each of them was optimized for the individual requirements of the experiments and taking into account the characteristics of the storage rings. However all the device can be conditionally divided into several groups with similar features: high field wigglers (up to 7.5 T) with long period (140-200 mm), middle field (2.5-4.2 T) with middle period (46-64 mm) and low field (2-2.1 T) with short period (30-34 mm). The superconducting wiggler cryostats which are developed in BINP are operated not only with zero liquid helium consumption but even with a lower relative to the atmosphere pressure despite of additional heat load from the electron beam and from the current of ~1000 A for supplying of superconducting magnet. This allows not only to avoid a helium loss but also to increase the level of the magnetic field due to the shifting of the critical parameters of superconducting wire. The features of magnetic and cryogenics systems of the superconducting wigglers produced in BINP are presented in this report., Proceedings of the 26th Russian Particle Accelerator Conf., RUPAC2018, Protvino, Russia

Louisiana State University installed a 7.5 T superconducting wiggler in May 2013 on the electron storage ring located at the Bennett Johnson, Sr. Center for Advanced Microstructures and Devices (CAMD). The wiggler’s influence on betatron tunes and functions, orbit, lifetime, performance, and other relevant beam parameters are described. We further comment on device operations and modifications to ring operations that were necessary to provide light for both wiggler and dipole stations., Proceedings of the 6th Int. Particle Accelerator Conf., IPAC2015, Richmond, VA, USA

A 3.5 Tesla 64 mm period superconducting wiggler (SCW) was constructed by the Russian Budker Institute of Novosibirsk (BINP) and installed in the Elettra storage ring as a photon source for the second X-ray diffraction beamline in November 2002, but never used due to the lack of the funding required for the beamline construction. About three years ago, the beamline construction was finally funded together with the refurbishment of the SCW. This upgrade, that was necessary in order to make the SCW operations compatible with the top up mode of the storage ring aimed in a drastic reduction of the liquid helium consumption by means of replacing the cryostat with a new version. At the same time the upgrade aimed as well to improve the reliability of the cryostat, to update the control system and to verify the magnetic field performance after a very long time of inactivity. In this paper we present and discuss the performances of the SCW following its refurbishment carried out by BINP team and its re-commissioning in the Elettra storage ring., Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany

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