Numerical Design Optimization of Short-Period HTS Staggered Array Undulators

Hellmann, S.; Calvi, M.; Schmidt, Thomas; Zhang, Kai

doi:10.1109/tasc.2020.2965873

Cited by 11 publications

(11 citation statements)

References 11 publications

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“…Super-Conducting Undulators are also candidates for short-period undulators, and the subject of important Research and Development activities 68 – 74 . Other designs, based on magnetic materials (possibly high-temperature superconductors) polarised by a large solenoid, are also being studied 75 – 82 .…”

Section: Photon Sources In the New Latticementioning

confidence: 99%

The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility

et al. 2023

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The Extremely Brilliant Source (EBS) is the experimental implementation of the novel Hybrid Multi Bend Achromat (HMBA) storage ring magnetic lattice concept, which has been realised at European Synchrotron Radiation Facility. We present its successful commissioning and first operation. We highlight the strengths of the HMBA design and compare them to the previous designs, on which most operational synchrotron X-ray sources are based. We report on the EBS storage ring’s significantly improved horizontal electron beam emittance and other key beam parameters. EBS extends the reach of synchrotron X-ray science confirming the HMBA concept for future facility upgrades and new constructions.

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Section: Photon Sources In the New Latticementioning

confidence: 99%

The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility

et al. 2023

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“…COMSOL and ANSYS have been used to solve the magnetisation problem: the first implements the popular H-formulation while the second uses a new approach based on the A-V formulation [27]. In this paper, the main results of the design optimisation are introduced, more details can be found in [28]. In figure 2 the results of a 3D model with periodic boundary conditions are presented where the current and trapped field are highlighted.…”

Section: The Superconducting Staggered Array Principlementioning

confidence: 99%

A GdBCO bulk staggered array undulator

Calvi

Ainslie

Dennis

et al. 2019

Supercond. Sci. Technol.

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The Insertion Device group of the Paul Scherrer Institute has started an R&D program on a high temperature superconducting undulator to reduce the period length and increase the undulator's magnetic field well beyond the present capability. Simulation results for a 10 mm period and 4 mm magnetic gap staggered array of GdBCO bulks predict peak magnetic field above 2 T. Building on the existing working principle of undulator design and simulated performance, the first experimental results of a 5 period 6.0 mm gap short undulator measured in the new test facility available at the University of Cambridge will be presented together with details of the experimental setup and sample preparation.

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“…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.

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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

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Numerical Design Optimization of Short-Period HTS Staggered Array Undulators

Cited by 11 publications

References 11 publications

The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility

The Extremely Brilliant Source storage ring of the European Synchrotron Radiation Facility

A GdBCO bulk staggered array undulator

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

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