Fabrication of a Short-Period ${\rm Nb}_{3}{\rm Sn}$ Superconducting Undulator

Dietderich, D.R.; Godeke, A.; Prestemon, S.; Pipersky, P.; Liggins, N.; Higley, H.; Marks, S.; Schlueter, R.

doi:10.1109/tasc.2007.897747

Cited by 27 publications

(10 citation statements)

References 9 publications

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“…The potential of SCUs, however, is extremely high, and planar SCUs will bypass CPMUs as soon as new materials will be employed such as NbTi with artificial pinning centers or Nb 3 Snwires (prototype undulators have already been tested (Weijers et al 2006;Dietderich et al 2007;Synchrotron Light Sources andFree-Electron Lasers DOI 10.1007/978-3-319-04507-8_16-1 © Springer International Publishing Switzerland 2014 Kim et al 2005)). The magnetic field can be pushed further by various means like sophisticated thin liners for magnetic gap reduction, cold bore designs, and operation temperature reduction below 4.2 K. Already now helical SCUs (dedicated to single-pass machines) outperform planar CPMUs, because helical hybrid PMU designs do not exist yet.…”

Section: Superconducting Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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Periodic magnetic structures, i.e., undulators and wigglers, have been used for nearly 40 years as sources of brilliant synchrotron radiation. Today, sophisticated undulator designs provide many degrees of freedom such as photon beam energy, variable polarization, and orbital angular momentum. Specific designs efficiently suppress higher orders or reduce the on-axis power density. All tuning parameters are required to be freely accessible by the users. Still, the majority of undulators is based on permanent magnets with a clear trend to short periods and in-vacuum and cryogenically cooled systems. Similar designs are used for storage rings and free electron lasers, though the field quality requirements are different. Today, the optimization of a specific experiment follows a global approach. This includes not only the undulator design itself but also local lattice modifications to cope with ambitious designs, elaborate tracking schemes to estimate the impact on the dynamic aperture, and last but not least radiation propagation tools which transport a realistic photon beam phase space to the sample. This chapter summarizes the theory of undulator radiation and reviews the technological realization of undulators and wigglers. Operational issues are discussed, as well.

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Section: Superconducting Undulatorsmentioning

confidence: 99%

Shaping Photon Beams with Undulators and Wigglers

Bahrdt¹

2014

Synchrotron Light Sources and Free-Electron Lasers

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“…current, or nearly, in testing [2,3,4]. It is clear that the Nb 3 Sn conductor is viable for use in SCUs.…”

Section: Technical Reportsmentioning

confidence: 99%

“…The solid blue line is the NbTi critical current density limit, showing its variation with the magnetic field in the coil windings. The solid red line is the corresponding curve for Nb3 Sn. The lower three curves, referenced to the right axis, show the peak field on the axis of the superconducting undulator as a function of current density for pole gaps of 7, 8.5, and 10 mm.…”

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confidence: 99%

Development of Superconducting Undulators at the Advanced Photon Source

Ivanyushenkov

Moog

2011

Synchrotron Radiation News

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IntroductionThe Advanced Photon Source (APS) at Argonne National Laboratory is a 1-km-circumference, 7-GeV, third generation synchrotron light source. It is the largest light source in the Western Hemisphere and attracts about 3,500 users every year from around the globe. The APS is currently preparing for a major upgrade, a goal of which is to focus on high brightness at photon energies of around 20 keV and higher. The APS is particularly well suited for this high photon energy range due to its higher-energy, 7-GeV electron beam, but it also needs new insertion devices with short periods and high fields, i.e., superconducting devices. Motivation for superconducting undulatorsThe advantage of applying superconducting technology to undulators was recognized by both high-energy physicists and the synchrotron light source community in the 1970-80s when the first few devices were built [1]. Rare-earth permanent magnets became available then, however, and could be used to build permanent magnet devices with sufficiently high magnetic field at a modest price. Recently, the interest in SCUs has been sparked again because superconducting technology can outperform all other available technologies in terms of achievable magnetic peak field on the undulator axis for a given period length and magnetic gap.On-axis brilliance tuning curves for permanent-magnet hybrid undulators with period lengths of 3.3 cm (the existing undulator A), 2.5 cm, and 2.3 cm are shown in Figure 1, along with curves for some 1.6-cm-period-length superconducting undulators. The SCUs include the first short test undulator, SCU0; a longer, 1.8-m undulator (which would be in a 2.4-m long cryostat); and an advanced superconducting device, ASCU, with enhanced peak field as explained below. The advantage of superconducting undulators over hybrid devices is particularly pronounced at higher (>20 keV) photon energy.Although the peak field of hybrid devices can be increased by placing the magnetic structures in vacuum and reducing the magnetic gap by the thickness of the vacuum chamber walls, this approach is impractical for the APS storage ring because the beam impedance would be too high in operating modes that are used frequently. The superconducting device retains a beam chamber with a 7.2 mm vertical beam aperture.

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“…In recent years there has been increasing interest in superconducting undulator technology for synchrotron radiation and free-electron lasers applications (Kim et al, 2003;Trakhtenberg et al, 2010;Ivanyushenkov et al, 2012Ivanyushenkov et al, , 2014Ivanyushenkov et al, , 2015Dietderich et al, 2007;Hezel et al, 1999;Boffo et al, 2010;Hwang et al, 2006;Moser & Rossmanith, 2002;Grau et al, , 2011Mashkina et al, 2008a,b;Kostka et al, 2004). Superconducting undulator yields have shown improved performance over normal conducting electromagnetic wigglers and permanent magnet undulators.…”

Section: Introductionmentioning

confidence: 99%

Magnetic design and modelling of a 14 mm-period prototype superconducting undulator

Mishra

Gehlot

Sharma

et al. 2017

J Synchrotron Radiat

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The magnetic design of a ten-period (each period 14 mm) prototype superconducting undulator is reported using RADIA. The results of modelling the magnetic flux density are presented in an analytical formula. The dependence of the field integrals and phase error on the current density and undulator gap has been calculated, and temperature curves are determined for the models and are compared with earlier reported Moser-Rossmanith fits.

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Fabrication of a Short-Period ${\rm Nb}_{3}{\rm Sn}$ Superconducting Undulator

Cited by 27 publications

References 9 publications

Shaping Photon Beams with Undulators and Wigglers

Shaping Photon Beams with Undulators and Wigglers

Development of Superconducting Undulators at the Advanced Photon Source

Magnetic design and modelling of a 14 mm-period prototype superconducting undulator

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