Conceptual Design of a 5 T 200 mm 1 T/s Ramping NbTi Synchrotron Magnet for Cancer Treatment

Recently, a collaborative research to develop an allsuperconducting synchrotron system for cancer treatment was embarked by a team led by Electronics and Telecommunications Research Institute in Korea. The system requires a 5 T dipole magnet with a uniform field region in cylindrical shape of 130 mm in diameter and 3000 mm in length, and operates at a ramping rate of 1 T/s. As the first step of the project, this paper presents a conceptual design of the magnet that consists of six single-layer cosine windings made of the NbTi Rutherford cable. Key design results include: (1) spatial field uniformity, ΔB/B-4within a target space of |r|3with the current sharing temperature of 5.65 K; and (6) adiabatic temperature rise of 87 K upon a quench.