Conceptual design of a magnet system to generate 20t in a 0.15m diameter bore,211 employing an inductor precooled by liquid nitrogen

摘要

The research program for an eventual neutrino factory or muon coltider needs a211u001emagnet of -0.15 m diameter bore to generate approx. 20 T over a length of approx. 211u001e0.3 m. Downstream for approx. 3 m the field should fall gradually to approx. 1.25 211u001eT, white the bore increases fourfold inversely as the square root of the field. A 211u001econventional magnet would require approx. 40 MW; a superconducting or hybrid 211u001emagnet might cost tens of millions of dollars. An economically feasible system 211u001eemploys a pulse magnet precocded by liquid nitrogen, with two sets of coils 211u001eenergized sequentially.