球形储能腔能量倍增器的研制

Accelerating gradient is an important parameter of an accelerator. Both of the leader of the next generation large collider, the international linac collider (ILC) and the compact linac collider (CLIC), need a very high accelerating gradient to achieve the design goals. The RF pulse compression technology can improve the accelerating gradient by compressing the pulse width to improve the peak output power of the klystron. Now in China, there is a large gap comparing to the international advanced level on the aspect of RF pulse compression related technology, and considering the technical pre-research and reserves, it is quite necessary to start the research of it. Basing on investigating the domestic and international relevant research, the subject will carry out the research and design of the S-band spherical storage cavity energy doubler (SLED) related technology. It will aim at mastering the key technology of spherical storage cavity SLED which includes the understanding and application of the related theory about the mode and field distribution in spherical cavity. Furthermore, a satisfying mode converter which is used for the transition between the standard waveguide and the spherical cavity will be designed, and the coupling design and optimization work between them will also be accomplished. During the whole design process, the fabrication and adjustment as well as the test work are also the important and difficult points. In one word, it is a work containing high technology for researching the S-band spherical storage cavity SLED. It is hoped to study the international advanced level and to improve the international competitiveness of China on this aspect through the study work of this subject.

加速梯度是加速器的重要指标，以国际直线对撞机ILC和紧凑型直线对撞机CLIC为首的下一代大型对撞机都需要很高的加速梯度来达到设计目标，RF脉冲压缩技术可以通过压缩脉冲提高速调管输出峰值功率，进而达到提高加速梯度的目的。目前国内在RF脉冲压缩相关领域与国际先进水平存在着较大差距，同时考虑到进行技术预研与储备，开展RF脉冲压缩技术的研究变得非常迫切。本课题将在充分调研国际国内相关研究的基础上，开展S波段球形储能腔能量倍增器（SLED）相关技术的研究与设计，旨在掌握球形储能腔SLED的关键技术，包括对球形腔模式，场分布等相关理论的理解和应用，设计出满足要求的模式转换器件来进行标准波导与球形腔之间的过渡，完成波导与球形腔的耦合设计和优化。同时，整个系统的加工，调配及测试也是研究的重点和难点。总之，进行S波段球形储能腔SLED的研究是一项技术含量很高的工作，希望通过该课题的研究，提升国际竞争力。

加速梯度是加速器的重要指标，RF脉冲压缩技术可以通过压缩脉冲宽度来提高速调管输出峰值功率，进而达到提高加速梯度的目的。相比于使用更高功率的速调管，能大幅度节约成本，而脉冲压缩器（能量倍增器）正是实现此功能的核心设备。能量倍增器的发展趋势，是结构更加紧凑简易，同时能量倍增因子更高，而这些正是球形储能腔能量倍增器的优势所在。. 本课题通过3年时间，完成了球形储能腔能量倍增器整体的仿真设计与加工测试，实测脉冲压缩效果与功率增益非常理想，与理论及仿真值较为符合。摸索出了一整套设计加工经验，为今后的应用打下了坚实基础。. 工作于S波段的球形储能腔能量倍增器可以根据需要设计于各种工作模式，或扩展到其它频段，在大科学工程中有较好的应用前景。