Critical Technology Development for 16 Tesla Head-only MRI Superconducting Persistent Magnets: V2

项目总结 先进的大脑研究需要超高场磁共振系统。11.7T NeuroSpin CEA磁共振磁体 通过使用超流氦冷却，将超导NbTi材料的使用推向了极限。去设计 并建立一个经济实惠的16T磁头只有MRI磁体，必须使用Nb3Sn线。为了减少这样的风险 一种高场、高应力、高储能的磁体，关键技术必须在16T 可以实现磁共振成像系统。其中最大的风险之一是Nb3Sn线圈复合材料母材在高温下的开裂 高机械应力和高热应力。GE Research将在高背景下设计和测试Nb3Sn测试线圈 用磁场(~8.5T)评价新型陶瓷-纤维绝缘复合材料基体在高温下的完整性 机械应力和热应力。未反应Nb3Sn丝、反应丝和NbTi与Nb3Sn线上的持久接头 电线将在外部磁场下进行开发和测试。联合阻力目标为10-10-9 磁体以持续模式运行的。

PROJECT SUMMARY Advanced brain research demands ultra-high field MRI systems. The 11.7 T Neurospin CEA MRI magnet pushed the use of superconducting NbTi materials to the limit by using superfluid helium to cool. To design and build a cost effective 16 T head-only MRI magnet, Nb3Sn wires must be used. To reduce the risks with such a high-field, high-stress, and high-stored energy magnet, critical technologies must be developed before a 16 T MRI system can be realized. One of the biggest risks is the cracking of the Nb3Sn coil composite matrix under high mechanical and thermal stress. GE Research will design and test Nb3Sn test coils under high background magnetic fields (~8.5 T) to evaluate the integrity of novel ceramic-fiber insulation composite matrix under high mechanical and thermal stress. Persistent joints on unreacted Nb3Sn wires, reacted wires, and NbTi to Nb3Sn wires will be developed and tested under external magnetic fields. Joint resistance is targeted to be <10-10 - 10-9  for the magnet to operate in a persistent mode.