Improved Modeling of Canted–Cosine–Theta Magnets

Brouwer, Lucas; Arbelaez, Diego; Caspi, S.; Marchevsky, M.; Prestemon, S.

doi:10.1109/tasc.2017.2775565

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…The analysis reported here does not consider the tensile load on the CORC R wire that appears in the CCT configuration. Detailed analysis on the mechanics of conductor and magnet structures with more realistic conditions will be carried out in future studies [63], [64]. More experimental data on the conductor performance under transverse electromagnetic forces are important to inform future magnet and conductor designs aiming at a dipole field of 15 T or higher.…”

Section: Discussionmentioning

confidence: 99%

An Initial Look at the Magnetic Design of a 150 mm Aperture High-Temperature Superconducting Magnet With a Dipole Field of 8 to 10 T

Wang

Arbelaez

Brouwer

et al. 2023

IEEE Trans. Appl. Supercond.

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High-temperature superconducting REBa2Cu3O7−x (REBCO) conductors have the potential to generate a high magnetic field over a broad temperature range. The corresponding accelerator magnet technology, still in its infancy, can be attractive for future energy-frontier particle colliders such as a multi-TeV muon collider. To help develop the technology, we explore the requirements and potential characteristics of a REBCO magnet, operating at 4.2 or 20 K, with a dipole field of 8 --10 T in a clear aperture of 150 mm. We use the canted cos θ magnet configuration to reduce the electromagnetic stresses on the conductors. We present the resulting dipole fields, field gradients for combined-function cases, conductor stresses, magnet dimensions and conductor lengths. We also discuss the conductor performance that is required to achieve the target dipole field at 4.2 and 20 K. The information can provide useful input to the development of REBCO magnet and conductor technology for collider-ring magnets in a muon collider.

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Section: Discussionmentioning

confidence: 99%

An Initial Look at the Magnetic Design of a 150 mm Aperture High-Temperature Superconducting Magnet With a Dipole Field of 8 to 10 T

Wang

Arbelaez

Brouwer

et al. 2023

IEEE Trans. Appl. Supercond.

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“…It can be seen that the winding of each layer exhibits a periodic symmetry in the axial direction, which also can be derived by equations (1)-( 3). e minimum periodic length is the pitch of the conductor path which is the turn-to-turn axial distance expressed by h. e symmetry region can be repeated in a laminated pattern to form the complete CCT layer [12]:…”

Section: Mechanical Structurementioning

confidence: 99%

“…For higher efficiency, ten wires were placed in one groove by the 2 × 5 arrangement with series connection. e operating current is 400 A. e stability of superconducting magnet mechanical structure is one of the main reasons for quench [5][6][7][8], so the stress-strain analysis on the magnet structure plays an important role on the magnet design [9][10][11][12][13][14][15], particularly for the complex structure of the CCT quadrupole magnet. e analysis model is created by cutting a section from the structure with a pitch owing to its periodic symmetry in the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Structure Design and Analysis of Canted‐Cosine‐Theta (CCT) Superconducting Quadrupole Magnet

Zhao

Chen

Liang

et al. 2021

Shock and Vibration

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A superconducting quadrupole magnet based on the Canted-Cosine-Theta (CCT) type coil with a gradient field of 40 T/m and a bore diameter of 60 mm has been designed for the preresearch of two projects of high intensity accelerator facility (HIAF) and accelerator driven subcritical system (ADS). The magnet is comprised of two-layer coils embedded in the formers and the end plates for locating. The coil formers made of aluminum alloy are machined with grooves according to the drive equations of CCT for placing the wires. The existence of ribs between two adjacent wires can avoid accumulation of the electromagnetic force. It is important to take the mechanical design for the complex structure to avoid tensile stresses on the conductor and confine the stresses within a reasonable value. The stress analysis for the quadrupole magnet has been carried out considering the thermal shrinking due to cool down as well as the electromagnetic force on the coil. This paper reports the detailed stress analysis for the CCT quadrupole magnet structure, discusses the calculating results, and gives a reasonable mechanical design.

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“…For the stranded conductor, the source term is now supplied by the circuit and determines the form of K Ai . Considering the weak integral of the source term in 2D (J is now a scalar J z ), and that the current density of the stranded conductor is derived from the current per turn i using The 2D matrices in the voltage balance are derived from equations (11), (13), and (15). The e term is re-written as an area integral with the shape functions added, such that The user element is coupled to an external circuit as voltage source using the standard distribution, circuit element CIRCU124 [22].…”

Section: Appendixmentioning

confidence: 99%

“…We present a new approach using only the commercial finite element software ANSYS [9]. It has previously been demonstrated that ANSYS has the capability to simulate some aspects of the complete problem, such as quench propagation [10][11][12] and the effect of eddy currents in mechanical structures on the current decay of a circuit coupled magnet [13]. We show user defined elements replicating these features and adding the additional missing capabilities of: (1) modeling magnetization of the conductor due to coupling currents and (2) combining all the effects into a single, coupled simulation with field and temperature dependent material properties.…”

Section: Introductionmentioning

confidence: 99%

User defined elements in ANSYS for 2D multiphysics modeling of superconducting magnets

Brouwer¹,

Arbelaez²,

Auchmann³

et al. 2019

Supercond. Sci. Technol.

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Dynamic simulation of superconducting magnets is critical for the design of quench protection systems to prevent potentially damaging temperatures and high voltage from developing after magnet quench. Modeling these scenarios is challenging due to the many multiscale phenomena which impact magnet behavior. These range from conductor scale effects of quench and interfilament coupling currents up to the behavior of the magnet in its powering and protection circuit. In addition, a strong coupling between electromagnetic and thermal domains is required to capture temperature and field dependent material properties and quench behavior. We present a finite element approach which integrates the various effects into the commercial software ANSYS by means of programming new element types. This is shown capable of simulating the strongly coupled transient electromagnetic, thermal, and circuit behavior of superconducting magnets required for quench protection studies. A benchmarking study is presented which shows close agreement between the new ANSYS elements and a COMSOL Multiphysics implementation developed at CERN for dump resistor and Coupling Loss Induced Quench (CLIQ) based magnet protection of a Nb 3 Sn block dipole. Following this, the ANSYS implementation is shown reproducing strongly coupled quench back behavior observed during the test of a Nb 3 Sn superconducting undulator prototype at Lawrence Berkeley National Laboratory.

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Improved Modeling of Canted–Cosine–Theta Magnets

Cited by 19 publications

References 16 publications

An Initial Look at the Magnetic Design of a 150 mm Aperture High-Temperature Superconducting Magnet With a Dipole Field of 8 to 10 T

An Initial Look at the Magnetic Design of a 150 mm Aperture High-Temperature Superconducting Magnet With a Dipole Field of 8 to 10 T

Structure Design and Analysis of Canted‐Cosine‐Theta (CCT) Superconducting Quadrupole Magnet

User defined elements in ANSYS for 2D multiphysics modeling of superconducting magnets

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