A. Montvai

Magnetic Field, Force and Stress Calculations for Modular Helias Coil Systems

At IPP Garching, the future experiment WENDELSTEIN VII-X is being developed. A Helias configuration ( Helical A dvanced S tellarator) has been chosen because of its confinement and stability properties. Superconducting coils are favoured because of their steady state field, but pulsed water-cooled copper coils could be used also. Two limiting cases are studied for WVII-X with the major radius between R 0 = 5 m and R 0 = 6.5 m, the magnetic induction between B 0 = 4 T and B 0 = 3 T at a stored magnetic energy of W ≈ 0.66 GJ and W ≈ 0.88 GJ. The stress and strain distributions caused by the electromagnetic forces have been investigated by finite-element computations. A mutual support scheme is used between adjacent coils. For a typical load case, the equivalent stress reaches a peak value of about 110 MPa in the composite conductor.