in MW. The question of what field strength B should be used is settled by establishing the field that minimizes the mass of the magnet. The reactor is a layered device with cylindrical symmetry. The radius of the plasma chamber sufficient to contain the migma disc (or discs) is, say, For the known neutron spectrum a thickness of LiH shielding of about 40 cm is sufficient. Allowing another 10 cm for insulation and plumbing, we find for the inner radius of the magnet It is known from equilibrium calculations that the magnetic field must be highly uniform in order to attain a high degree of diamagnetism [8], thus we require a length of coil per cell of r2. Thus the total length of coil is where we have used the assumed value of j and no=4nx 10-7 H m-1. Combining Eqs. 14 and 16 and assuming a mass density of 2.8 Mg m-2 (aluminum stabilized superconductor), we find for the magnet mass in Mg per MW of raw power output
RkJQdWJsaXNoZXIy MTU5NjU0Mg==