Cryogen-free Light-weight Superconducting Beam Bending Magnets for Proton Therapy

 描述（由申请人提供）：该快速通道项目的总体目标是将超导磁体设计和新磁体拓扑结构中的创新联合收割机结合起来，为质子束治疗中使用的旋转机架创建轻型环形束流偏转磁体。磁体对于双光束扫描治疗是稳健的，因为磁体是干燥的（没有液氦冷却剂）并且可以承受来自快速变化的磁场的AC损耗（需要改变光束的能量以调整光束到肿瘤中的穿透）。这种环形弯曲磁铁将使用一种独特的、无冷冻剂的自屏蔽超导磁铁，这使得该扫描仪对于使用质子束的笔形束扫描具有吸引力。所提出的弯曲磁体使用创新的磁体拓扑结构，该磁体拓扑结构是沿梁沿着的恒定场并且自屏蔽磁场，从而消除了铁的需要和重量。高场（1.5T及更高）无制冷剂MRI磁体的设计和制造中的成熟技术与创新的恒定场环向场射束偏转磁体相结合，实现了机架设计的重大突破。

 DESCRIPTION (provided by applicant): The overall goal of this Fast Track project is to combine innovations in superconducting magnet design and new magnet topologies to create a lightweight toroidal beam bending magnet for rotating gantries used in proton beam therapy. The magnet is robust for pencil-beam scanning therapy, as the magnet is dry (no liquid helium coolant) and can withstand AC losses from rapidly varying magnetic fields (needed for varying the energy of beam to adjust penetration of the beam into the tumor). This toroidal bending magnet will use a unique, cryogen-free self- shielded superconducting magnet that makes the scanner attractive for pencil beam scanning using a proton beam. The proposed bending magnet uses an innovative magnet topology that is constant field along the beam and self-shields the magnetic field, eliminating the need and weight of the iron. The combination of proven technologies in design and manufacturing of high-field (1.5T and higher) cryogen- free MRI magnets and the innovative constant-field toroidal field beam bending magnet results in a significant breakthrough gantry design.