2004
DOI: 10.1109/tmag.2004.825464
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A Vector Hysteresis Model for Superconducting Filament Magnetization in Accelerator Magnets

Abstract: Abstract-Magnetic field changes in the coils of superconducting magnets are shielded from the filaments' core by so-called persistent currents which can be modeled by means of the critical state model. This paper presents a semianalytical two-dimensional model of the filament magnetization due to persistent currents for changes of the magnitude of the magnetic induction and its direction while taking the field dependence of the critical current density into account. The model is combined with numerical field c… Show more

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Cited by 7 publications
(5 citation statements)
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“…Suspicious measurement data can be tested and validated by comparison. In the low-field region, where the persistentcurrent effects on field quality are dominant, the ROXIE model [14] can yield data for powering cycles that have not been measured previously.…”
Section: Field-quality Simulationmentioning
confidence: 99%
“…Suspicious measurement data can be tested and validated by comparison. In the low-field region, where the persistentcurrent effects on field quality are dominant, the ROXIE model [14] can yield data for powering cycles that have not been measured previously.…”
Section: Field-quality Simulationmentioning
confidence: 99%
“…2 shows the measured values of the transfer function, normalized in the sake of clarity. For comparison, theoretical values have been computed with Roxie [3], [4]. Roxie includes a vector hysteresis model to study the magnetization of superconducting coils in presence of fields with changing direction.…”
Section: A Single Poweringmentioning
confidence: 99%
“…Regarding superconductor magnetization, Figure 14(b) presents a comparison of the induced b 3 hystereses computed when taking into account the full effect (no corrective shims) and when introducing two ferromagnetic shims at suitable locations inside the coils: one 1.5-mm-thick shim attached right below the upper wedge of the outer layer and one 0.7-mm-thick shim attached right below the middle wedge of the inner layer, as shown in Figure 15. The effects of persistent magnetization currents were estimated using a ROXIE feature which combines a vector hysteresis model for hard superconductors with the BEM-FEM method and which relies on a given J C (B) fit function for the superconducting filaments [49]. The J C (B) function used in the simulation is shown in Figure 16.…”
Section: Cern Contributionmentioning
confidence: 99%