Superconducting switch concept applied to superconducting undulator phase-error correction

Madur, A.; Trillaud, F.; Dietderich, D.R.; Marks, S.; Prestemon, S.; Schlueter, R.

doi:10.1063/1.3463264

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Similar shimming approach was later employed by Hwang et al in a 40-pole NbTi planar SCU prototype, showing a peak field of 40 mT (3% of the pole field strength) could be achieved to compensate the phase field error at a particular pole [59]. In 2010, Madur et al experimentally demonstrated that the current direction in a certain trim coil could be adjusted by means of bridge of superconducting heater switches and extended the superconducting bridge concept to control all trim coils [176]. Based on this heater switch concept, Arbelaez et al proposed to use lithographic ReBCO coated conductor for local field correction and numerically studied the possible compensation field provided by the correct current loops [177].…”

Section: Trim Coil and Switchable Hts Current Loopsmentioning

confidence: 99%

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Zhang

Calvi²

2022

Supercond. Sci. Technol.

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Superconducting undulators (SCUs) with period >15 mm can offer much higher on-axis undulator field B0 than state-of-the-art cryogenic permanent magnet undulators (CPMUs) with the same period and vacuum gap. The commissioned NbTi planar SCUs for user operation in the Karlsruhe Institute of Technology (KIT) synchrotron and the Advanced Photon Source (APS) storage ring are operated stably without quenches, producing outperformed photon flux in the high energy part of the hard X-ray spectrum. Another potential advantage of deploying SCU is its radiation hardness, a crucial characteristic for being used in free electron lasers (FELs) driven by high repetition rate superconducting linear accelerators (LINACs) and diffraction limited storage rings (DLSRs) with small vacuum gap and large averaged beam current. Development of shorter period but high field SCU is an important mission in an EU founded CompactLight project as this technology would reduce both the length of undulators and the length of LINACs. This review paper first overviews the research and development of SCUs worldwide from late 1970s to 2021, then presents the SCU design requirements and compares the theory limits of different types of planar and helical SCUs, and finally reviews the technical challenges including the SCU cryostat, the magnetic field measurement, the integral/local field correction and the high-temperature superconductor (HTS) challenges and prospects the research needs for SCUs.

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Section: Trim Coil and Switchable Hts Current Loopsmentioning

confidence: 99%

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Zhang

Calvi²

2022

Supercond. Sci. Technol.

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“…[9]. Other are active, such as superconducting coils [5], [10] and a superconducting switch network [11]. The concept of correction with line current pairs has been proposed in [12].…”

Section: Introductionmentioning

confidence: 99%

Error Analysis and Field Correction Methods in Superconducting Undulators

Rochepault

Arbelaez

Prestemon

et al. 2014

IEEE Trans. Appl. Supercond.

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“…Several methods for field correction in superconducting undulators have previously been Manuscript proposed, for example: those using trim coils [3], inductionshims [8], and modifications to the iron pole geometry [9]. At LBNL, a tuning scheme using coils (wound around individual poles) and superconducting switches was developed, and the concept of a superconducting switch network was designed and successfully tested [10]. This scheme uses a superconducting wire network along with heaters in order to redirect the flow of current from one wire loop to another.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Correction Concepts for Superconducting Undulators

Arbelaez

Lee

Pan

et al. 2013

IEEE Trans. Appl. Supercond.

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The ability to correct magnetic field errors in a superconducting undulator is critical for the successful application of these devices in future and existing light sources. These field errors, which can emanate from sources such as machining and coil winding imperfections, can lead to reduced light source performance by introducing errors in both the electron trajectory and the relative phase relationship between the oscillating electrons and the emitted photons. In this work, correction schemes are presented, which use a single power supply along with a superconducting switch network to define the path for the current during undulator tuning. The basic switching concept was previously designed and successfully tested at Lawrence Berkeley National Laboratory; the approach presented here is a significant advancement in generalizing and scaling that core concept. A new fabrication method is presented here, which uses lithographic methods to produce current paths and switch heaters on a superconducting film. The effect of an example corrector current path design on the magnetic field is investigated using the Finite Element Method, and the results at various undulator and corrector energization levels are presented. Experimental results from the heater switch concept are also presented.

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Superconducting switch concept applied to superconducting undulator phase-error correction

Cited by 6 publications

References 5 publications

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Error Analysis and Field Correction Methods in Superconducting Undulators

Magnetic Field Correction Concepts for Superconducting Undulators

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