Self-field degradation effect in adiabatic conditions

Duchateau, J.L.; Turck, B.

doi:10.1016/0011-2275(74)90123-4

Cited by 24 publications

(19 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6 In this paper, the centers of the round filaments or the cylindrical layers are taken as the integration path in Eq. Previously, for the condition of zero magnetic enclosed flux, the magnetic flux enclosed between the adjacent current carrying layers was calculated only for the matrix layer between r i ഛ r ഛ r i+2 , instead of ͑r i−1 + r i ͒ /2ഛ r ഛ ͑r i+1 + r i+2 ͒ /2 in Eq.…”

Section: B Field Energy and Flux Calculation For Composite With Comentioning

confidence: 99%

“…[1][2][3][4] Under the assumption that each strand is straight, i.e., as shown in Figs. [5][6][7][8][9][10] Practical superconducting composites have various cross sectional structures ranging from composites having a relatively small number of filaments for magnetic resonance imaging magnets, as shown in Figs. [1][2][3][4] The current distributions of a twisted superconducting composite, as shown in Figs.…”

Section: Introductionmentioning

confidence: 99%

“…6 However, there is a small difference between the two current distributions, which is due to the shielding circulation current through the normalmetal matrix between the filaments of the adjacent layers. Both the mag- netic energy and the magnetic flux enclosed between the strands or filaments are calculated, utilizing the analytical expression of the vector potentials due to the helical conductor.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calculations using the helical filamentary structure for current distributions of a six around one superconducting strand cable and a multifilamentary composite

Tominaka

2004

Journal of Applied Physics

View full text Add to dashboard Cite

The current and magnetic-field distributions within a twisted six around one (6-1) superconducting strand cable and a twisted simple superconducting multifilamentary composite have been studied with the assumption that the current distribution within each strand or each filament is uniform. For this purpose, the vector potential and the magnetic field due to a helical conductor with a circular cross section is calculated from the numerical integration of the analytical expression for a helical thin conductor. The current distributions among each strand or each filament are obtained by minimizing the magnetic energy for the case of the insulated strands or filaments, and by requiring zero magnetic flux enclosed between any pair of strands or filaments for the case of the noninsulated strands or filaments. For the case of the untwisted insulated strands or filaments, it is confirmed that the calculated results coincide with those due to the inductance. The screening circulation currents among strands within a multistrand cable or filaments within a composite are obtained as the difference between the current distributions for the case with the noninsulated strand or filament and for the case with the imaginarily insulated strand or filament. As a result, it is revealed that the negative current in the inner strands or filaments is a universal feature of the current distributions for superconducting multistrand cables and multifilamentary composites during the current sweep. Finally, the magnetic field distributions of a twisted 6-1 superconducting strand cable and a twisted simple superconducting multifilamentary composite have been obtained.

show abstract

Section: B Field Energy and Flux Calculation For Composite With Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calculations using the helical filamentary structure for current distributions of a six around one superconducting strand cable and a multifilamentary composite

Tominaka

2004

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Superconductor instabilities, while well known as far back as the late 1960's [1][2][3], and studied by various authors over time [4][5][6][7][8][9][10][11][12][13] have manifested themselves in the new generation of Nb 3 Sn developmental magnets because of the large increases in the critical currents of Nb 3 Sn strands. Instabilities in high performance Nb 3 Sn strands are an important concern and potential limiting factor for magnet performance [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Although the well known phenomenon of low-field flux jumps [4] is present in the M-H loops [5], these are not the primary difficulty, in that the instability manifests itself (and is particularly troublesome) at fields above the regime of low field flux jumping [17,19]. Models of instability in the presence of transport currents [6][7][8][9], or currents and fields [10,11] are available, but there is a need to apply them specifically to the present generation of strands. On an operational level, the construction of magnets with more stable strands has been pursued [21], as well as the improvement of the stability of the strands themselves.…”

Section: Introductionmentioning

confidence: 99%

STABILITY IN Nb[sub 3]Sn CONDUCTORS; MAGNETIC AND SELF-FIELD INSTABILITY CONSIDERATIONS AT 4 K AND 2 K

Sumption¹

2010

AIP Conference Proceedings

View full text Add to dashboard Cite

Stability in Nb 3 Sn conductors and cables is an important issue for Nb 3 Sn magnets generally, and High Energy Physics (HEP) magnets specifically. Substantial understanding of the instabilities has been gained in recent years, by adapting and applying well known models to the conductors of the present day. In this work, the results of an investigation of the roles of Residual Resistance Ratio (RRR), d eff , and strand diameter in regimes of both magnetic and self-field instabilities at 4 K as well as 2 K are described. Simple analytic models are used to compare the relative strengths of these effects in various field regimes at 4 K and 2 K. The sensitivity of the instabilities to RRR, d eff , and strand diameter are then described. The influence of the simultaneous changing of external field and strand transport (as would be present in a magnet) on the relative strengths of the self-field and the magnetization based current distributions is then discussed.

show abstract

Superconductors, Stabilization Against Flux Jumps

Turck

Maccioni

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

View full text Add to dashboard Cite

The sections in this article are Introduction Fundamental Equations and Calculations General Stability Criterion Applications to a Few Simplified or Usual Criteria Summary Influence of The Outer Shell Thickness and of the Heat Transfer Coefficients Determination of the Stable Current I s in a Particular Example Small Perturbation and the Critical State Model Conclusion Nomenclature

show abstract

Self-field degradation effect in adiabatic conditions

Cited by 24 publications

References 1 publication

Calculations using the helical filamentary structure for current distributions of a six around one superconducting strand cable and a multifilamentary composite

Calculations using the helical filamentary structure for current distributions of a six around one superconducting strand cable and a multifilamentary composite

STABILITY IN Nb[sub 3]Sn CONDUCTORS; MAGNETIC AND SELF-FIELD INSTABILITY CONSIDERATIONS AT 4 K AND 2 K

Superconductors, Stabilization Against Flux Jumps

Contact Info

Product

Resources

About