The central solenoid of the ohmic heating system for a tokamak fusion device.

**Problem Type:**

An axisymmetric problem of magneto-structural coupling.

**Geometry:**

The solenoid consists of 80 superconducting coils fixed in common plastic structure. Due to mirror symmetry one half of the structure is modeled.

**Given:**

- Magnetic data:

Current density in coils*j*= 300·10^{6}A/m^{2};

Magnetic permittivity of plastic, coils and liquid helium inside coils*μ*= 1. - Stress analysis data:
Copper of coils:

Young's modulus*E*= 7.74·10^{10}N/m^{2};

Poisson's ratio*ν*= 0.335;

Maximum allowable stress: 2.2·10^{8}N/m^{2}.Plastic structure:

Young's modulus*E*= 2·10^{11}N/m^{2};

Poisson's ratio*ν*= 0.35;

Maximum allowable stress: 1·10^{9}N/m^{2}.

See the *Coupl4MS.pbm* and *Coupl4SA.pbm* problems in the Examples folder for the corresponding DC magnetics and stresses analysis parts of this problem.