Coil design considerations and cost analysis for neutral beam magnets

The hollow and mixed conductor coils offer performance and size compatible with the requirements. The mixed conductor coil is somewhat more efficient, but some physical constraints may make the hollow conductor preferable. The mixed conductor coil has 2 sets of leads coming out. One set is for current; the other is for water. Space limitations may require restricting to coil to a single set of leads. It is important to maintain a spare parts inventory. The present design has all four coils identical, minimizing that inventory. The coil design is based on readily available conductor sizes and shapes. There is some leeway designed into the coil as it is shown to allow some small variations by vendors