Title :
Mechanical behaviour of cabled superconductors under transverse and longitudinal loads [for NET]
Author_Institution :
Max-Planck-Inst. fur Plasmaphys., Munchen, Germany
fDate :
1/1/1992 12:00:00 AM
Abstract :
As part of the development for the magnet system for the NET (Next European Torus) Tokamak machine (Next European Torus) for fusion research, 40 kA cable-in-conduit type Nb3Sn superconductors are being manufactured and tested. A model has been developed for the behavior of strands randomly oriented in a superconducting cable. The model predicts that frictional heating in such cables, due to either transverse magnetic loading or applied longitudinal strain or both combined, is not a significant heat source compared to AC losses. Under typical operational conditions in the ABB cable, with εleff =0.0015, σteff=6.4 MPa, and an applied external transverse strain to the jacket of -0.0015, the maximum strains predicted in the strands are (with c=4 mm); due to the transverse stress (longitudinal bending) ±0.3%, due to the longitudinal strain (direct) 0.15%
Keywords :
Tokamak devices; composite superconductors; fusion reactor materials; fusion reactor theory and design; magnetic leakage; niobium alloys; superconducting cables; superconducting magnets; tin alloys; 40 kA; AC losses; NET; Nb3Sn superconductors; applied longitudinal strain; cable-in-conduit type; cabled superconductors; frictional heating; heat source; longitudinal loads; mechanical behaviour; model; randomly oriented strands; superconducting cable; transverse magnetic loading; transverse strain; Capacitive sensors; Magnetic field induced strain; Manufacturing; Mechanical cables; Niobium; Superconducting cables; Superconducting magnets; Superconductivity; Tin; Tokamaks;
Journal_Title :
Magnetics, IEEE Transactions on
