Trial manufacture of the biperiodic DAW accelerating tube

双周期DAW加速管的试制

• 批准号: 06554003
• 负责人: IWASHITA Yoshihisa
• 金额: $ 11.58万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06554003/
• 关键词: DAW; biperiodic L-support; electron accelerator; cold model; bridge coupler; choke structure

Disk-and-Washer accelerating structure, which has excellent stability, high efficiency and good vacuum property, has not been widely used, because it has the mode overlapping problem and its analysis was difficult with only two dimensional or axisymmetric RF codes. One of the purposes for this project is that the biperiodic structure can cure the problem even for the practical application. In these processes we have been trying to reduce the fabrication cost for the mass production. Material tests such as the RF characteristics or vacuum properties are also carried out.Based on the accumulated knowledge, a power model that can handle high RF power and can keep high vacuum is designed and fabricated. The total length is about 2.5m. The designed operation frequency is 2857MHz, so that it can replace one of the three existing disc-load waveguide accelerating tubes in our laboratory for acceleration tests. It consists of two endplates, two 1.2-m long accelerating tubes and one coaxial bridge coupler in between. We also investigated the coaxial bridge coupler and obtained sufficient results in design strategies and RF characteristics with the use of a choke structure. Three frequency tuners to be installed on the bridge coupler are designed and assembled. The remote control system for the tunes is prepared for the beam acceleration tests. Results from simulation codes and the cold model tests are combined with the measurements of the power model and they are consolidated for the preparation of the beam-acceleration tests.

圆盘垫圈加速结构具有优异的稳定性、高效率和良好的真空性能，但由于存在模态重叠问题且仅用二维或轴对称射频码难以分析，因此尚未得到广泛应用。该项目的目的之一是双周期结构甚至可以解决实际应用中的问题。在这些过程中，我们一直在努力降低批量生产的制造成本。还进行了射频特性或真空特性等材料测试。基于积累的知识，设计和制造了能够处理高射频功率并保持高真空的功率模型。总长度约为2.5m。设计的工作频率为2857MHz，可以替代实验室现有的三个盘载波导加速管之一进行加速测试。它由两个端板、两个1.2米长的加速管和中间的一个同轴桥式耦合器组成。我们还研究了同轴桥式耦合器，并在使用扼流圈结构的设计策略和射频特性方面获得了足够的结果。设计并组装了三个安装在桥式耦合器上的频率调谐器。曲调遥控系统是为梁加速测试准备的。将仿真代码和冷模型测试的结果与功率模型的测量结果相结合，并将它们合并以准备梁加速测试。

项目成果

岩下芳久: "Cold Model Test of Biperiodic L-Support Disk-and-Washer Linac Structure" Proc. of 1995 Particle Accelerator Conference, Texas. (in print).

Yoshihisa Iwashita：“双周期 L 型支撑盘和垫圈直线加速器结构的冷模型测试”，1995 年粒子加速器会议，德克萨斯州（印刷版）。

岩下 芳久、青 寛幸、野田 章、岡本 宏巳、白井 敏之、井上 信: "Power Model of Biperiodic DAWCavity" Proc.of the 1996 Linear Accelerator Conference,Geneva. 857-859 (1996)

Yoshihisa Iwashita、Hiroyuki Ao、Akira Noda、Hiromi Okamoto、Toshiyuki Shirai、Makoto Inoue：“双周期 DAWCavity 的功率模型”，1996 年线性加速器会议，日内瓦 857-859。

Y.Iwashita, et al.: "Fabrication of Biperiodic DAW cavity" Proc.of 1997 Particle Accelerator Conference, Vancouver. (in press).

Y.Iwashita 等人：“双周期 DAW 腔的制作”Proc.of 1997 粒子加速器会议，温哥华。

Y.Iwashita: "Biperiodic L-Support DAW For Electron Acceleration" Bulletin of the Instutute for Chemical Research, Kyoto University. 73. 97-105 (1995)

Y.Iwashita：“用于电子加速的双周期 L-Support DAW”京都大学化学研究所公告。

岩下 芳久、野田 章、岡本 宏巳、白井 敏之、井上 信: "Cold Model Measurement of Biperiodic L-Support DAW" Proc.of the 10th Symposium on Accelerator Science and Technology,Oct.15-17,1995 Hitachinaka,Japan. 67-69 (1995)

Yoshihisa Iwashita、Akira Noda、Hiromi Okamoto、Toshiyuki Shirai、Makoto Inoue：“双周期 L-Support DAW 的冷模型测量”第十届加速器科学与技术研讨会论文集，1995 年 10 月 15-17 日，日本 Hitchinaka 67。 -69 (1995)