用于ECR源产生难熔金属离子束的感应高温炉研制

As the main injector of heavy ion accelerator, ECR ion source needs to provide more and more intense highly charged refractory metallic ion beams. This requires the performance of ECR ion source to be further improved so that the metallic oven can work for a long time at ultra-high temperature. Compared with traditional resistive oven, the induction oven is designed to use high-frequency heating to overcome the problem of deformation caused by Lorentz force. It can work normally in an ECR ion source under the strong magnetic field. Based on the completion of new induction oven structure design, this project will focus on the effective utilization and restriction of eddy effect, the effective shielding of heat conduction and thermal radiation, and the surface coating on the crucible. Finally, the prototype of induction oven will be fabricated, and it will be tested on the offline test platform at Institute of Modern Physics. According to the results, a high-temperature induction oven with working temperature over 2000 degrees C and life more than 1000 hours will be designed and fabricated.

ECR离子源作为最主要的注入器，为重离子加速器提供强流高电荷态难熔金属离子束的需求日益增加。这要求对ECR离子源的性能进一步提高，使金属高温炉能够在超高温度下长时间稳定工作。感应高温炉采用高频加热，克服了传统电阻型高温炉因受洛伦兹力而变形的问题，能够在ECR离子源强磁场环境下稳定工作。本申请项目将在完成新型感应高温炉结构设计的基础上，重点研究交变磁场产生涡流的有效利用与限制、热传导与热辐射的有效屏蔽以及坩埚表面的喷涂工艺等问题。最后将完成感应高温炉的原型制造，并在近代物理研究所的高温炉测试平台上进行实验验证，根据反馈信息，最终设计出一款工作温度达到2000℃以上，寿命达到或超过1000小时的感应高温炉。

在高电荷态ECR离子源上利用感应加热技术为重离子加速器提供强流高电荷态难熔金属离子，具有束流强度高、长期工作稳定的优点。感应高温炉采用高频加热，克服了传统电阻型高温炉因受洛伦兹力变形的问题，能够在ECR离子源强磁场（2-3.6 T）环境下稳定工作。项目掌握了ECR离子源感应高温炉传输耦合匹配、热屏蔽、难熔金属与陶瓷相容性、炉头小型化等关键技术。离线测试结果表明，感应加热功率约1.2 kW情况下，坩埚温度可达到2000℃以上。在线测试结果表明，该类型感应高温炉能够满足难熔金属离子的产生需求，成功产生并提供Fe17+、Ni18+、Mn17+、U37+等难熔金属离子，连续工作时间从几天至数周，束流强度从40~500 euA不等。该项目的研究成果将为HIAF大科学工程所需强流高电荷态金属离子提供技术支持。