Magnetic shielding properties of a superconducting hollow cylinder containing slits: modelling and experiment

被引：19

作者：

Fagnard, J-F ^{[1
,2
]}

Elschner, S. ^{[3
]}

Hobl, A. ^{[4
]}

Bock, J. ^{[4
]}

Vanderheyden, B. ^{[1
,2
]}

Vanderbemden, P. ^{[1
,2
]}

机构：

[1] SUPRATECS, B-4000 Liege, Belgium

[2] Dept Elect Engn & Comp Sci B28, B-4000 Liege, Belgium

[3] Univ Appl Sci Mannheim, D-68163 Mannheim, Germany

[4] Nexans SuperConductors GmbH, D-50531 Hurth, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2012年 / 25卷 / 10期

关键词：

CRITICAL-STATE; FIELD; TUBES; PENETRATION;

D O I：

10.1088/0953-2048/25/10/104006

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

This paper deals with the magnetic properties of bulk high temperature superconducting cylinders used as magnetic shields. We investigate, both numerically and experimentally, the magnetic properties of a hollow cylinder with two axial slits which cut the cylinder in equal halves. Finite element method modelling has been used with a three-dimensional geometry to help us in understanding how the superconducting currents flow in such a cut cylinder and therefore how the magnetic shielding properties are affected, depending on the magnetic field orientation. Modelling results show that the slits block the shielding current flow and act as an 'entrance channel' for the magnetic flux lines. The contribution of the slits to the total flux density that enters the cylinder is studied through the angle formed between the applied field and the internal field. The modelled data agree nicely with magnetic shielding properties measured on a bulk Bi-2212 hollow cylinder at 77 K. The results demonstrate that the magnetic flux penetration in such a geometry can be modelled successfully using only two parameters of the superconductor (constant J(c) and n value), which were determined from magnetic measurements on the plain cylinder.

引用

页数：9

共 41 条

[1] MAGNETIZATION OF HARD SUPERCONDUCTORS [J].

BEAN, CP .

PHYSICAL REVIEW LETTERS, 1962, 8 (06) :250-+

[2] ANALYTIC SOLUTION OF THE CRITICAL-STATE MODEL FOR AN ELLIPTIC CYLINDER WITH FIELD-DEPENDENT CRITICAL CURRENT-DENSITY [J].

BHAGWAT, KV ;

CHADDAH, P .

PHYSICAL REVIEW B, 1991, 44 (13) :6950-6954

[3] MELT CAST PROCESSED (MCP)-BSCCO-2212 TUBES FOR POWER APPLICATIONS UP TO 10 KA [J].

BOCK, J ;

ELSCHNER, S ;

HERRMANN, PF .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1995, 5 (02) :1409-1412

[4] Unusual critical states in type-II superconductors [J].

Brandt, E. H. ;

Mikitik, G. P. .

PHYSICAL REVIEW B, 2007, 76 (06)

[5] Superconductors of finite thickness in a perpendicular magnetic field: Strips and slabs [J].

Brandt, EH .

PHYSICAL REVIEW B, 1996, 54 (06) :4246-4264

[6] Superconductor disks and cylinders in an axial magnetic field. I. Flux penetration and magnetization curves [J].

Brandt, EH .

PHYSICAL REVIEW B, 1998, 58 (10) :6506-6522

[7] CRITICAL CURRENTS AND THE EFFECTS OF PINNING [J].

CAMPBELL, AM .

IEEE TRANSACTIONS ON MAGNETICS, 1991, 27 (02) :1660-1667

[8]

CARR WJ, 2001, AC LOSS MACROSCOPIC, P212

[9] Theory and experiment testing flux-line cutting physics [J].

Clem, John R. ;

Weigand, Marcus ;

Durrell, J. H. ;

Campbell, A. M. .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2011, 24 (06)

[10] Field penetration into hard type-II superconducting tubes: effects of a cap, a non-superconducting joint, and non-uniform superconducting properties [J].

Denis, S. ;

Dirickx, M. ;

Vanderbemden, Ph ;

Ausloos, M. ;

Vanderheyden, B. .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2007, 20 (05) :418-427

← 1 2 3 4 5 →