Sage Journals: Discover world-class research

Abstract

A structural stress evaluation method and an analysis system in the design of superconducting coils with an inner ring support is described from the point of view of the mechanical strength. This system includes winding stress calculation, thermal stress calculation due to cooling-down, and magnetic stress calculation by the magnetic load in three dimensions. In order to obtain the axisymmetric or three-dimensional winding stress including the effects of axial load, a new calculation method called the "Changing Stiffness Method" has been developed. The accuracy of the winding stress calculation method has been verified from several studies and the effectiveness of the method on the coil supported with a flanged ring has also been verified. The analysis system has been applied to a high-field and high-homogeneity coil for experiment. The results of the calculations provide valuable information on the strength and the quench in the coil.

Get full access to this article

View all access options for this article.

References

Middleton

A.J.

and Trowbridge

C.W.

, Mechanical Stress in Large High Field Magnet Coils, Proc. Intern. Symposium on Magnet Technology, Rutherford Laboratory, Didcot, England (1967), p. 140.

Montogomery

, Solenoid Magnet Design (Wiley, New York, 1980), pp. 109–130.

Thome

R.J.

and Tarrah

J.M.

, MHD and Fusion Magnets; Field and Force Concepts (Wiley, New York, 1982), pp. 180–201.

Johnson

N.E.

, Stress analysis of nonhomogeneous superconducting solenoids, IEEE Trans. Magn. 22 (1971) 490.

Fowlker

C.W.

., Characterization of a Superconducting Coil Composite (National Bureau of Standards, Boulder, Colorado, 1973).

Zienkiewicz

O.C.

, The Finite Element Method in Engineering Science (McGraw-Hill London, 1971) pp. 103–153.

Tsai

S.W.

and Wu

E.M.

, General

Theory of Strength for Anisotropic Materials J. Composite Materials (Jan. 1971) 58–80.

Miya

., Study on the reduction of quench occurrence in superconducting coils, IEEE Trans. Magn., 24, No. 2 (1988) 1548–1551.

Takagi

., An investigation of mechanical disturbance in superconducting magnet by structural analysis, Ionics (Feb. 1987) (in Japanese).

10.

Tsai

S.W.

, Structural behavior of composite materials, NASA CR-71.

11.

ASTM, Standard Method of Flexure Test of Flat Sandwich Constructions (1970), C393-62.

A Practical Structural Stress Evaluation System for Superconducting Coils with Inner Ring Support

Abstract

Get full access to this article

References