Energy and critical current considerations of Bi(2223)/Ag coils for micro-superconducting magnetic energy storage: influence of operating temperature and winding geometry within the same overall tape length

Pitel, J.; Kòváč, Pavol; Lehtonen, J.; Paasi, Jaakko

doi:10.1088/0953-2048/14/4/301

Cited by 9 publications

(12 citation statements)

References 33 publications

(37 reference statements)

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“…This is because the magnetic field is the largest there and the anisotropy of the tape is not very large (figure 2). This is in contrast to coils made of Bi2223 tapes, where the limiting turn is at the average radius on the top and bottom ends [51]. The reason is that Bi2223 tapes are highly anisotropic.…”

Section: Critical Current Of the Coilsmentioning

confidence: 89%

AC loss in ReBCO pancake coils and stacks of them: modelling and measurement

Pardo¹,

Šouc²,

Kováč³

2012

Supercond. Sci. Technol.

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Many applications of ReBCO coated conductors contain stacks of pancake coils. In order to reduce their high AC loss, it is necessary to understand the loss mechanisms. In this article, we measure and simulate the AC loss and the critical current, Ic, in stacks of pancake coils ("pancakes"). We construct stacks of up to 4 pancakes and we measure them by electrical means. We also obtain the anisotropic field dependence of Jc from Ic measurements of the tape. This Jc is the only input to the simulations, together with the coil dimensions. After validating our computations with the measurements, we simulate stacks of many pancakes, up to 32. We found that the AC loss in a stack of (four) pancakes is very high, two orders of magnitude larger than for a single tape. A double pancake behaves as a single one with double width but a stack of more pancakes is very different. Finally, we found that a 2-strand Roebel cable reduces the AC loss in a stack of pancakes but not in a single pancake. In conclusion, our simulations are useful to predict the ac loss of stacks of coated conductor pancake coils and to reduce the ac loss by optimizing the coil design.

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Section: Critical Current Of the Coilsmentioning

confidence: 89%

AC loss in ReBCO pancake coils and stacks of them: modelling and measurement

Pardo¹,

Šouc²,

Kováč³

2012

Supercond. Sci. Technol.

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“…STEP6: STEP6 has two kinds of procedures for each section in this paper. , which is the electric field criterion of the minimum critical current I cmin [19,20]. We finally obtain the current, I, versus voltage, V , characteristics and the critical current, I cmin , of the HTS coil.…”

Section: Step4mentioning

confidence: 99%

Coupled-analysis of current transport performance and thermal behaviour of conduction-cooled Bi-2223/Ag double-pancake coil for magnetic sail spacecraft

Nagasaki¹,

Nakamura²,

Funaki³

et al. 2013

Physica C: Superconductivity

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“…The experimental data (Table 1) are close to calculated stored energy values. We received with coil made of 600 m wire (doubled wire was used) the stored energy that can be received without core with 5 km of HTS wire [7].…”

Section: Example Of Smesmentioning

confidence: 99%

“…The major elements of these SMES's are Nb-Ti coils immersed in liquid helium bath. But HT-SMES's presently pass through the first stage of research and development [2][3][4][5][6][7]. This process already encountered several difficulties related to their electromagnetic and thermal properties.…”

Section: Introductionmentioning

confidence: 99%