Development of Beam Position Monitor Using HOM Coupler

使用 HOM 耦合器的光束位置监测器的开发

• 批准号: 18560049
• 负责人: SAWAMURA Masaru
• 金额: $ 1.48万
• 依托单位: Japan Atomic Energy Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560049/
• 关键词: Accelerator; HOM coupler; Beam Position Monitor

Abeam position monitor was developed using HOM coupler attached to JAEA ERL-FEL, superconducting linac. A shifter magnet was designed and made to control the electron beam position. Analysis of electro-magnetic field with 3D code MAFIA was used to calculate the beam trajectory. The shifter magnet was installed at the upstream of the first main accelerator. HOM power was measured by changing the shifter magnet current The HOM power was found to be represented by the sum of the square of beam position (sum of the initial beam position and beam shift proportional to shifter magnet current) and the square of the beam position fluctuation. The measured HOM powers and shifter magnet currents were fitted with the analytic formula to estimate the beam position and beam position fluctuation. JAEA ERL-FEL was estimated to have the beam offset of 0.23 mm and -0.31mm and the beam position fluctuation of 0.21 mm and 0.60 mm in horizontal and vertical reprehensively. When the beam position fluctuates, HOM power is not zero even if the beam passes through the axis. Scanning the beam position enable to estimate the beam position and the beam position fluctuation precisely.

利用日本原子能机构ERL-FEL超导直线加速器上的HOM耦合器研制了束流位置监测器。设计并制作了一个移动磁铁来控制电子束的位置。利用三维电磁场分析软件MAFIA计算了束流轨迹。换档磁铁安装在第一个主加速器的上游。HOM功率通过改变移位器磁体电流来测量。发现HOM功率由束位置的平方（初始束位置和束移位与移位器磁体电流成比例的总和）和束位置波动的平方的总和来表示。利用解析公式对测量的HOM功率和移频磁铁电流进行拟合，估算出束流位置和束流位置波动。JAEERL-FEL的束流偏移量为0.23 mm和-0.31 mm，束流位置起伏为0.21 mm和0.60 mm。当光束位置波动时，即使光束通过轴，HOM功率也不为零。通过扫描束流位置，可以精确估计束流位置和束流位置波动。

项目成果

Output Properties of IOT RF Sources

物联网射频源的输出特性

• 发表时间: 2006
• 期刊: Proceedings of the 3rd Annual Meeting of Particle Accelerator Society of Japan and the 31^31^ Linear Accelerator Meeting in Japan
• 作者: 山田貴博;松井和己;山田貴博;Takahiro Yamada;沢村 勝;Masaru Sawamura
• 通讯作者: Masaru Sawamura

IOT高周波出力特性

IoT高频输出特性

• 发表时间: 2006
• 期刊: 第3回加速器学会年会・第31回リニアック技術研究会プロシーディングス
• 作者: 山田貴博;松井和己;山田貴博;Takahiro Yamada;沢村 勝
• 通讯作者: 沢村 勝