Magnetic properties of arrays of superconducting strips in a perpendicular field

Pardo, Enric; Sanchez, Alvaro; Navau, Carles

doi:10.1103/physrevb.67.104517

Cited by 76 publications

(88 citation statements)

References 64 publications

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“…In the present paper we overcome this limitation and provide an algorithm that provides accurate solutions of the London theory by finding the current distribution that minimizes the free energy. A similar minimization method [28] has been used to obtain the magnetization curves of arrays of superconducting strips in homogeneous magnetic fields. The numerical method presented in this paper can solve more general geometries in arbitrary inhomogeneous magnetic fields, including most of the geometries that are typically present in atom chips.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Meissner effect on magnetic microtraps for neutral atoms near superconducting thin films

et al. 2008

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We theoretically evaluate changes in the magnetic potential arising from the magnetic field near superconducting thin films. An example of an atom chip based on a three-wire configuration has been simulated in the superconducting and the normal conducting state. Inhomogeneous current densities within the superconducting wires were calculated using an energy-minimization routine based on the London theory. The Meissner effect causes changes to both trap position and oscillation frequencies at short distances from the superconducting surface. Superconducting wires produce much shallower micro traps than normal conducting wires. The results presented in this paper demonstrate the importance of taking the Meissner effect into account when designing and carrying out experiments on magnetically trapped neutral atoms near superconducting surfaces.

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Section: Introductionmentioning

confidence: 99%

Impact of the Meissner effect on magnetic microtraps for neutral atoms near superconducting thin films

et al. 2008

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“…4, the full saturation field of the unstriated Roebel cable is about 4 times of those for the striated strands (green inverted triangle). The significantly lower saturation field of the striated strands is not due to a reduction of the critical current by laser scribing and is somewhat more than that expected [12] by the flux compression between the filaments. Although the saturation field H P s of the transposing section in the unstriated Roebel is quite subtle for a smaller strand number of 10, it is still visible on closer inspection, as shown by the example of 50 K in the inset of Fig.…”

Section: A Reduction Of Roebel Cable Magnetization Losses With Striamentioning

confidence: 65%

“…The 2D approach of side-by-side magnetic coupling of two stacks of m tapes is within the scope of [12], however, a calculation based on a thin strip [11] is more straightforward and avoids the need for computer modelling. …”

Section: Roebel Cable As Two Magnetically Coupled Stacks Of Tape Smentioning

confidence: 99%

AC Losses of Roebel Cables with Striated 2G REBCO Strands

Yang

Pelegrin

Young

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-We present experimental data on the ac losses in Roebel cables with striated 2G REBCO strands. Electromagnetic measurements by pick-up coils were carried out at different temperatures between 10 K and 85 K at frequencies between 2 Hz and 20 kHz in transverse ac fields up to 0.5 T. The Roebel cable samples were assembled from laser cut 2G REBCO strands, which consist of striated filaments prepared with laser scribing. Measurements at different temperatures show that the Roebel cables with striated strands have a lower losses by a factor of strand filament number over the whole temperature range. For analysis, a semiquantitative approach for unstriated Roebel was found to work satisfactorily. However, the Striated Roebel cables appears to have a different field penetration from those of the unstriated Roebel. The coupling current among the filaments has a time constant shorter than 0.1 ms and do not appear to increase in the striated Roebel cables, hence insignificant for most magnets related applications.

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“…8,9 Then, the electromagnetic behaviors and AC losses in stack of superconducting strips were widely studied by investigators, such as vertical arrays, horizontal arrays, and matrix arrays. [10][11][12][13][14][15][16] In addition, since the AC loss is dependent on many factors, some researchers also paid their attentions to the effects of frequency and defects on the AC losses of superconductors. [17][18][19][20][21][22][23] The above investigations mainly studied the AC losses in superconducting layers without ferromagnetic substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

et al. 2015

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This paper presents an investigation on the AC losses in several typical superconducting composite conductors using the H-formulation model. A single superconducting strip with ferromagnetic substrate or cores and a stack of coated conductors with ferromagnetic substrates are studied. We consider all the coated conductors carrying AC transport currents and simultaneously exposed to perpendicular AC magnetic fields. The influences of the amplitude, frequency, phase difference and ferromagnetic materials on the AC losses are investigated. The results show that the magnetization losses of single strip and stacked strips have similar characteristics. The ferromagnetic substrate can increase the magnetization loss at low magnetic field, and decrease the loss at high magnetic field. The ferromagnetic substrate can obviously increase the transport loss in stacked strips. The trends of total AC losses of single strip and stacked strips are similar when they are carrying current or exposed to a perpendicular magnetic field. The effect of the frequency on the total AC losses of single strip is related to the amplitude of magnetic field. The AC losses decrease with increasing frequency in low magnetic field region while increase in high magnetic field region. As the phase difference changes, there is a periodic variation for the AC losses. Moreover, when the strip is under only the transport current and magnetic field, the ferromagnetic cores will increase the AC losses for large transport current or field.

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Magnetic properties of arrays of superconducting strips in a perpendicular field

Cited by 76 publications

References 64 publications

Impact of the Meissner effect on magnetic microtraps for neutral atoms near superconducting thin films

Impact of the Meissner effect on magnetic microtraps for neutral atoms near superconducting thin films

AC Losses of Roebel Cables with Striated 2G REBCO Strands

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

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