3D Modeling of High Temperature Superconducting Staggered Array Undulator

Zhong, Zhaoyang; Zhang, Min; Wang, Wei; Chudý, Michal; Chen, Yiran; Hsu, C. H.; Huang, Zhen; Coombs, Tim

doi:10.1109/tasc.2013.2238271

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2010, Majoros et al first adopted the FEM software FLUX 3D for simulating the magnetic fields in a 3D Nb 3 Sn helical SCU model [22]. In 2013, Zhong et al adopted the FEM software COMSOL for simulating the magnetic fields in a staggeredarray bulk HTSU with the H-formulation method [153]. Further work on modelling HTS undulators with COMSOL were reported by Nguyen and Ashworth [80] and Hellmann et al [110].…”

Section: Modelling Toolsmentioning

confidence: 99%

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

Zhang

Calvi²

2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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.

show abstract

Section: Modelling Toolsmentioning

confidence: 99%

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

Zhang

Calvi²

2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In the models, we approximate this by applying a uniform background magnetizing field. The past prototypes and FEM simulations were all based on staggered-array half-moon-shaped bulk superconductors acting as a compact insertion device [3,4,81,82]. In this section, we study the undulator field generated by staggered-array cuboid bulks, to which the pre-stress can be applied more homogeneously because of their regular shape.…”

Section: Large-scale 3d Modelling Of the Bhtsu Critical State Currentsmentioning

confidence: 99%

“…However, other numerical methods, including those combined with FEM, have also shown excellent performance in modelling the critical state [37,40,46,50,52]. So far, the numerical analysis of magnetization currents in the BHTSU has been carried out with the 3D H-formulation [81,82], the MEM method [83], the RAA-combined T-Ω formulation [45,46,84], and the recently proposed backward computation method [52]. In particular, the backward computation method has shown excellent performance in simulating the magnetization currents in a periodical BHTSU model with 1.8 million DOFs within 1.4 h [52].…”

Section: Introductionmentioning

confidence: 99%

Fully-staggered-array bulk Re-Ba-Cu-O short-period undulator: large-scale 3D electromagnetic modelling and design optimization using A-V and H-formulation methods

Zhang

Ainslie

Calvi

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The development of a new hard x-ray beamline I-TOMCAT equipped with a 1 m long short-period bulk high-temperature superconductor undulator (BHTSU) has been scheduled for the upgrade of the Swiss Light Source at the Paul Scherrer Institute. The very hard x-ray source generated by the BHTSU will increase the brilliance at the beamline by over one order of magnitude in comparison to other state-of-the-art undulator technologies and allow experiments to be carried out with photon energies in excess of 60 keV. One of the key challenges for designing a 1 m long (100 periods) BHTSU is the large-scale simulation of the magnetization currents inside 200 staggered-array bulk superconductors. A feasible approach to simplify the electromagnetic model is to retain five periods from both ends of the 1 m long BHTSU, reducing the number of degrees of freedom to the scale of millions. In this paper, the theory of the recently-proposed 2D A-V formulation-based backward computation method is extended to calculate the critical state magnetization currents in the ten-period staggered-array BHTSU in 3D. The simulation results of the magnetization currents and the associated undulator field along the electron beam axis are compared with the well-known 3D H-formulation and the highly efficient 3D H-φ formulation method, all methods showing excellent agreement with each other as well as with experimental results. The mixed H-φ formulation avoids computing the eddy currents in the air subdomain and is significantly faster than the full H-formulation method, but is slower in comparison to the A-V formulation-based backward computation. Finally, the fastest and the most efficient A-V formulation, implemented in ANSYS 2020R1 Academic, is

show abstract

Feasibility and Features of a Staggered Undulator Constructed With HTS YBCO Bulks

Chen

Hwang

Yang

et al. 2014

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

3D Modeling of High Temperature Superconducting Staggered Array Undulator

Cited by 4 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

Fully-staggered-array bulk Re-Ba-Cu-O short-period undulator: large-scale 3D electromagnetic modelling and design optimization using A-V and H-formulation methods

Feasibility and Features of a Staggered Undulator Constructed With HTS YBCO Bulks

Contact Info

Product

Resources

About