Spatial and Temporal Behavior of Magnetic Field Distribution Due to Shielding Current in HTS Coil for Cyclotron Application

Ueda, Hiroshi; Fukuda, Mitsuhiro; Hatanaka, K.; Wang, Tao; Ishiyama, Atsushi; Noguchi, So

doi:10.1109/tasc.2012.2234813

Cited by 44 publications

(25 citation statements)

References 7 publications

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“…We compared the simulation and measurement results of the magnet composed of two double-pancake and four single pancake (2D+4S) coils [16,20] with those of a FEM simulation, which is a 2D finite element method with thin approximation method (FEM+TAM) [11,12]. Table 2 and figure 6(a) show the magnet configuration, in which turns of all pancake coils are insulated between turns.…”

Section: Two Double-pancake and Four Single Pancake Coils (All Turns Insulated)mentioning

confidence: 99%

A simple screening current simulation method using equivalent circuit model for REBCO pancake coils

Noguchi¹,

Imai²,

Park³

et al. 2020

Supercond. Sci. Technol.

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The screening current induced in rare-earth barium copper oxide (REBCO) tape generates an unwanted irregular magnetic field. The screening current-induced field (SCIF) is a challenging issue for MRI, NMR, and accelerators magnet composed of REBCO coils. A few FEM-based simulation methods have been proposed to estimate the SCIF; however, they require a long computation time.Recently, we have proposed a simple SCIF computation method based on the self and mutual inductances of REBCO pancake coil and screening current radial paths on the top and bottom of pancake coils. Accuracy of the proposed method is not excellent; however, computation time is quite short. In this paper, we report an equivalent circuit model that includes the self and mutual inductances of a REBCO pancake coil and screening current radial path. Moreover, with this proposed method, we can compute SCIF of no-insulation (NI) REBCO pancake coils, while it is not the case with the previously proposed FEM-based simulation method. The proposed method has been validated by experiment. The proposed method is available online.

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Section: Two Double-pancake and Four Single Pancake Coils (All Turns Insulated)mentioning

confidence: 99%

A simple screening current simulation method using equivalent circuit model for REBCO pancake coils

Noguchi¹,

Imai²,

Park³

et al. 2020

Supercond. Sci. Technol.

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show abstract

“…This approximation is well known and often applied in coil analyses. Ueda's group raised the issue related to the insufficient precision of the HTS coil analysis using the nested-loops approximation, but the accuracies of the model with and without applying this approximation have not been compared with one another [10]. Here, we assumed that the coated conductor in a coil was exposed to the normal magnetic field whose longitudinal distribution was shown in Fig.…”

Section: B Modeling Of Coil Wound With Coated Conductormentioning

confidence: 99%

“…We call it the nested-loops approximation. Meanwhile, a couple of groups reported more exact modeling not using this kind of approximation [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Efficient and Practical Models for Numerical Electromagnetic Field Analyses of Three-Dimensional-Shape Coils Wound With Coated Conductor

Sogabe

Tsukamoto

Mifune

et al. 2015

IEEE Trans. Appl. Supercond.

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We have been developing a model for numerical electromagnetic field analyses of three-dimensional-shape coils wound with coated conductor. To analyze three-dimensional-shape coils in a reasonable computation time, we applied thin-strip approximation and other two approximations to our model: a nested-loops approximation and a block approximation. In a nested-loops approximation, each coil turn was approximated as cumulated closed-loops, in a block approximation, several consecutive turns were modeled with an identical current distribution: the bundle of these consecutive turns was called as a block. Analyses were carried out for a single pancake coil to evaluate the errors caused by these approximations. The current profiles as well as temporal evolution of ac losses were compared in various analyses with or without the nested-loops approximation and the block approximation. These approximations were applied to the numerical electromagnetic field analyses of a part of a saddle-shape coil.

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“…Owing to some unresolved technical issues of coated conductors such as weak transverse stress tolerance [11] and strong effect of field screening [12,13], there are also renewed interests in Bi-2223 (Bi 2 -Sr 2 -Ca 2 -Cu 3 -O x ) conductors, powder-in-tube multifilamentary wires rolled into tape form, especially following the recent improvement in mechanical strength by laminations with high strength alloys [14].…”

Section: Introductionmentioning

confidence: 99%

High field Ic characterizations of commercial HTS conductors

Miyoshi¹,

Nishijima

Kitaguchi

et al. 2015

Physica C: Superconductivity and its Applications

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Spatial and Temporal Behavior of Magnetic Field Distribution Due to Shielding Current in HTS Coil for Cyclotron Application

Cited by 44 publications

References 7 publications

A simple screening current simulation method using equivalent circuit model for REBCO pancake coils

A simple screening current simulation method using equivalent circuit model for REBCO pancake coils

Efficient and Practical Models for Numerical Electromagnetic Field Analyses of Three-Dimensional-Shape Coils Wound With Coated Conductor

High field Ic characterizations of commercial HTS conductors

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