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

项目摘要 先进的大脑研究需要超高场MRI系统。11.7 T Neurospin CEA MRI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。设计 并且构建成本有效的16 T仅头部MRI磁体，必须使用Nb 3Sn线。为了降低风险， 高磁场、高应力和高储能磁体，必须在16 T之前开发关键技术。 MRI系统可以实现。最大的风险之一是Nb 3Sn线圈复合材料基体在 高机械和热应力。GE Research将在高背景下设计和测试Nb 3Sn测试线圈 磁场（~8.5 T），以评估在高温下新型陶瓷纤维绝缘复合材料基体的完整性。 机械和热应力。未反应的Nb 3Sn线、反应的线和NbTi到Nb 3Sn的持久接头 将在外部磁场下开发和测试导线。接头阻力的目标是<10-10 - 10-9 使磁体以持久模式操作。

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.