Design of a 50 mm Bore Resistive Magnet Using a Novel Cooling Hole Shape

We present the final design of a 50 mm bore 31⁺ T Florida-Bitter type resistive magnet using a new shape for the cooling slots. The new shape is like the bow of a boat and effectively smears out stress peaks that usually occur near the sides of cooling slots in previously designed Bitter magnets. Thus peak stress reduction of approximately 20% is obtained. The four-sub-coil magnet will produce 31.2 T at a power dissipation of 17.7 MW, and it will be the most efficient magnet in its class. The three innermost sub coils will be used as an insert to our 8 T Hybrid outsert, providing 30 T continuously at only 9 MW of power