Reliable 4.8 T trapped magnetic fields in Gd–Ba–Cu–O bulk superconductors using pulsed field magnetization

Zhou, Difan; Srpcic, Jan; Huang, Kai; Ainslie, Mark; Shi, Yunhua; Dennis, Anthony; Boll, Martin; Filipenko, Mykhaylo; Cardwell, D. A.; Durrell, John

doi:10.1088/1361-6668/abd45a

Cited by 17 publications

(14 citation statements)

References 36 publications

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“…The n-value (the exponent in the power-law approximation of the voltage-current curves), which is also closely connected with the pinning properties of HTS materials, has been shown to be just as important in [19]: lower n-values lead to a higher temperature rise during PFM. As for the pulse parameters, the multi-pulse techniques (with constant or alternating amplitude) have shown their advantage over the single-pulse method [16,[20][21][22][23][24][25][26]. If such pulses are combined with the corresponding temperature regime (meaning, each pulse is applied at a specific temperature), even higher results can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies of bulk superconductors and stacks of HTS-tapes [1,15,18,24,[26][27][28][29][30][31][32][33][34][35][36][37] are dedicated to the socalled flux jumps (or 'giant field leaps' as first introduced in [27]). These jumps occur at certain critical (or activation) fields and result in a rapid invasion of the magnetic flux into the superconducting samples.…”

Section: Introductionmentioning

confidence: 99%

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Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Moroz¹,

Kashurnikov²,

Rudnev³

et al. 2021

J. Phys.: Condens. Matter

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The impact of temperature on the pulsed magnetization of a high-temperature superconductor (HTS) has been numerically studied. The resulting trapped field (TF) and its distribution over the HTS have been calculated for samples with random and periodic pinning (a regular triangular lattice). The increasing ambient temperature (within the considered values) has been shown to improve the field-trapping efficiency and lead to the possibility of pumping more flux into the sample with each consecutive pulse (contrary to the low-temperature case). Various pulse shapes produced different results at high temperatures. Trapezoidal pulses showed the highest efficiency owing to the constant-field segments during which the vortices continued to enter the sample. The critical (activation) field of flux jumps has been shown to decrease with the rising temperature. At the highest considered temperature (30 K), the flux jumps occurred during the TF relaxation. To the best of our knowledge, such calculations have been done for the first time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Moroz¹,

Kashurnikov²,

Rudnev³

et al. 2021

J. Phys.: Condens. Matter

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“…multi-pulse stepwise cooling (MPSC) [23], [24], can increase the trapped field in single-grain bulk discs, with fields of up to 5 T or more having been achieved [5,17]. Here, we explore the application of the MPSC method to ring bulks, to reduce heating [8], improve thermomagnetic stability and avoid flux jumps.…”

Section: B Mpsc Pfm Measurementsmentioning

confidence: 99%

“…The heating issue during the PFM process has been mitigated for disc bulk superconductors by employing various multipulse PFM methods and trapped fields up to 5 T or more have been achieved [5,17]. As an alternative method of increasing the trapped field, Hirano et al [16] magnetized a composite stack of two MgB 2 ring bulks to 1.61 T by elongating the magnetizing pulses and inserting iron yokes in the bore of the sample as well as the magnetizing split coil.…”

Section: Introductionmentioning

confidence: 99%

Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization

Tsui¹,

Moseley

Dennis³

et al. 2022

IEEE Trans. Appl. Supercond.

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One potential application of magnetized RE-Ba-Cu-O (where RE = rare earth or Y) bulk superconductors is as a highfield alternative to conventional permanent magnets in desktop NMR and MRI systems. Pulsed field magnetization (PFM) is one of the most promising practical methods of magnetizing such bulks. However, the trapped fields obtained by PFM are much lower than those obtained using quasi-static methods like field-cooling magnetization (FCM) due to heating during PFM. Furthermore, bulk superconducting rings have proved more difficult to magnetize via PFM than discs. The reported trapped fields in single bulk superconducting rings magnetized by PFM are less than 0.35 T at the centre of the bore due to thermomagnetic instabilities. In this work, systematic PFM measurements on a bulk Gd-Ba-Cu-O ring were carried out and a trapped field of 1.3 T at 55 K was achieved using a multi-pulse, stepwise cooling (MPSC) method. In the MPSC method, a sequence of pulsed fields is used to magnetize the ring bulk. The pulsed field is increased in small increments and the sample temperature is decreased sequentially. Consequently, as some field is already trapped after the first pulse, the motion of the flux for subsequent pulses will be reduced, leading to less heat generated in the bulk sample. This greatly improves the thermomagnetic stability of the PFM process, enabling larger trapped fields.

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“…Figure 1 illustrates a Pulsed Field magnetization (PFM) setup where a cooled superconductor is submitted to a short pulse (a few µs) of magnetic field. Figure 2 shows a typical experimental result with a trapped field that is shown to last for days, even weeks [2]. This multi-physics aspect makes the problem difficult to tackle theoretically when flux motion, mechanical and thermal time scales are considered.…”

Section: Introductionmentioning

confidence: 99%

An Abelian Higgs model of pulsed field magnetization in superconductors

Caputo¹,

Danaila²,

Cyril³

2021

Preprint

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Pulsed field magnetization leads to trapped magnetic field persistent for long times.We present a one-dimensional model of the interaction between an electromagnetic wave and a superconducting slab based on the Maxwell-Ginzburg-Landau (Abelian Higgs) theory. We first derive the model starting from a Lagrangian coupling the electromagnetic field with the Ginzburg-Landau potential for the superconductor. Then we explore numerically its capabilities by applying a Gaussian vector potential pulse and monitoring usual quantities such as the modulus and the phase of the order parameter. We also introduce defects in the computational domain. We show that the presence of defects enhances the remanent vector potential and diminishes the modulus of the order parameter, in agreement with existing experiments.

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Reliable 4.8 T trapped magnetic fields in Gd–Ba–Cu–O bulk superconductors using pulsed field magnetization

Cited by 17 publications

References 36 publications

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Thermal behavior of ﬂux jumps and inﬂuence of pulse-shape on the trapped ﬁeld during pulsed magnetization of a high-temperature superconductor

Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization

An Abelian Higgs model of pulsed field magnetization in superconductors

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