Abstract :
Steady fields in excess of 200 kOe can now be realised with normal conductors such as copper. Mechanical forces dominate the design problem beyond 250 kOe but, in principle, fields towards 500 kOe seem possible. Superconductors may have a natural upper limit near 250 kOe. For fields well in excess of 500 kOe, very-short-pulse techniques remain the only practicable method at present.