Numerical analysis of the end-field with correction coils for the superconducting undulator at IHEP

Wei, Junhao; Chen, Zilin; Zhang, Xiangzhen; Bian, Xiaojuan; Xu, Miaofu; Yang, Xiangchen; Li, Yuhui

doi:10.1016/j.nima.2021.166036

Cited by 2 publications

(1 citation statement)

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“…Most recently, a 50-period SCU16 device was successfully developed and tested at 200 mA beam current in the SSRF storage ring, obtaining a stable on-axis field B 0 of 0.62 T at 7.5 mm vacuum gap (10 mm magnetic gap) [63,64]. In 2019, the Institute of High Energy Physics (IHEP), Beijing initiated the R&D of SCUs for the high energy photon source under construction [65]. Very recently, a 0.5 m long SCU15 model was successfully developed and tested, obtaining an on-axis field B 0 of 1.01 T at 7 mm magnetic gap and a RMS phase error between 4 • and 10 • at the operation current from 100 to 400 A [66].…”

Section: Vr Nbti Planarmentioning

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: Vr Nbti Planarmentioning

confidence: 99%