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Title: Structural design of the superconducting Poloidal Field coils for the Tokamak Physics Experiment

The Tokamak Physics Experiment concept design uses superconducting coils made from cable-in-conduit conductor to accomplish both magnetic confinement and plasma initiation. The Poloidal Field (PF) magnet system is divided into two subsystems, the central solenoid and the outer ring coils, the latter is focus of this paper. The eddy current heating from the pulsed operation is excessive for a case type construction; therefore, a ``no case`` design has been chosen. This ``no case`` design uses the conductor conduit as the primary structure and the electrical insulation (fiberglass/epoxy wrap) as a structural adhesive. The model integrates electromagnetic analysis and structural analysis into the finite element code ANSYS to solve the problem. PF coil design is assessed by considering a variety of coil current wave forms, corresponding to various operating modes and conditions. The structural analysis shows that the outer ring coils are within the requirements of the fatigue life and fatigue crack growth requirements. The forces produced by the Toroidal Field coils on the PF coils have little effect on the maximum stresses in the PF coils. In addition in an effort to reduce the cost of the coils new elongated PF coils design was proposed which changes the aspect ratiomore » of the outer ring coils to reduce the number of turns in the coils. The compressive stress in the outer ring coils is increased while the tensile stress is decreased.« less
Authors:
;
Publication Date:
OSTI Identifier:
10125308
Report Number(s):
UCRL-JC--114266; CONF-931018--84
ON: DE94007078; TRN: 94:004578
DOE Contract Number:
W-7405-ENG-48; AC02-76CH03073
Resource Type:
Conference
Resource Relation:
Conference: Symposium on fusion engineering,Hyannis, MA (United States),11-15 Oct 1993; Other Information: PBD: 6 Oct 1993
Research Org:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SUPERCONDUCTING COILS; COMPUTER-AIDED DESIGN; TOKAMAK DEVICES; MECHANICAL STRUCTURES; FINITE ELEMENT METHOD; A CODES 700430; MAGNET COILS AND FIELDS