Title :
A Global Structural and Electromagnetic Finite Element Model for the Prediction of the Mechanical Behavior of the JT-60SA Superconducting Magnet System
Author :
Tomarchio, V. ; Barabaschi, P. ; Davis, S. ; Duglue, D. ; Hajnal, N. ; Phillips, G.
Author_Institution :
Eur. Home Team, JT-60SA, Garching, Germany
fDate :
6/1/2012 12:00:00 AM
Abstract :
The JT-60SA is a fusion experiment designed to contribute to the early realization of fusion energy by providing support to the operation of ITER; by addressing key physics issues for ITER and DEMO; and by investigating how best to optimize the operation of the next fusion devices that will be built after ITER. It is a combined project of the JA-EU Satellite Tokamak Program under the Broader Approach (BA) Program and JAEA´s Program for National Use, and it is to be built in Naka, Japan, using the infrastructure of the existing JT-60U experiment. The superconducting magnet system of JT-60SA consists of a Central Solenoid, six Equilibrium Field coils and eighteen Toroidal Field coils. The systems are connected to each other by means of flexible and kinematic mechanical attachments, with the Toroidal Field magnet acting as the structural backbone of the whole magnet system. This is then supported to the cryostat base of the machine through a series of gravity supports. A detailed finite element model, representing a 40 degree sector of the superconducting magnet system of JT-60SA, has been developed with particular focus on the mechanical connections between the different coil systems. A complete set of analyses were carried out to obtain the electromagnetic force distribution on the three magnet sub-systems during all operational scenarios and consequently to predict the corresponding stresses and deformations. By doing this the integrity of the system and the performance of its bolted and pinned connections were verified against the applicable codes and standards. This paper illustrates the details of the modeling strategy which lead to the production of the finite element model and provides a comprehensive report and a critical analysis of the most relevant results obtained to date.
Keywords :
Tokamak devices; cryostats; finite element analysis; solenoids; superconducting coils; superconducting magnets; DEMO; ITER; JA-EU Satellite Tokamak program; JT-60SA superconducting magnet system; JT-60U experiment; bolted connection; broader approach program; central solenoid; coil system; cryostat base; deformation; electromagnetic finite element model; electromagnetic force distribution; equilibrium field coil; flexible mechanical attachment; fusion energy; fusion experiment; global structural model; kinematic mechanical attachment; mechanical behavior prediction; mechanical connection; modeling strategy; pinned connection; stress; toroidal field coil; toroidal field magnet; Coils; Finite element methods; Magnetic confinement; Magnetomechanical effects; Superconducting magnets; Toroidal magnetic fields; Analysis; coils; magnet; structural; tokamak;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2011.2178577