RESEARCH ON BEAM FLATTENING BY USING THE HIGHER HARMONIC CAVITY IN THE HIGH INTENSITY PROTON ACCELERATOR.

高强度质子加速器中高次谐波腔束流平坦化研究。

• 批准号: 17540277
• 负责人: IRIE Yoshiro
• 金额: $ 1.73万
• 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: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540277/
• 关键词: high intensity proton accelerator; second harmonic cavity; beam flattening; beam loading; low output impedance; 第2高潮波空洞

It is essential to form a flattened bunch shape in a high intensity proton accelerator from view point of mitigation of the space charge effect. The second harmonic cavity is used for this end, where precise control of the cavity phase to the fundamental one is required. This project is intended for the beam experiments at the world highest proton synchrotron facility, ISIS, Rutherford Appleton Laboratory (RAL), UK in order to investigate the space charge effects by using the low-output impedance (LOI) second harmonic cavity. Since the LOI cavity is free from beam loading, precise control of the cavity phase can be achieved.In August, 2005, we succeeded in producing a required RF voltage, 12.6kV per gap, for the LOI system : the frequency was swept at 50Hz from 2.6 to 6.2MHz, and the output impedance less than 30ohms. Although a problem on waveform distortions in the driver stage remained to be solved, the LOI system became almost ready for installation into the ISIS synchrotron for beam test.In 2006, however, a new project on the muon ionization cooling experiment (MICE project) came up at the RAL. The experimental area we have used so far was allocated for this project, and we had no choice but to move elsewhere. The Hall 2 of the ISIS facility was refurbished to accommodate our LOI system. The movement of the LOI and re-cabling of all the power lines and control lines began in October, 2006. By the end of March, 2007, these works have been completed. Therefore, the proposed experimental research could not be performed : the beam experiments are foreseen in Fy2007 or later.

在强流质子加速器中，为了减小空间电荷效应，束团的扁平化是必要的。二次谐波腔用于此目的，其中需要精确控制腔相位到基波相位。本项目是在英国卢瑟福阿普尔顿实验室（RAL）的ISIS质子同步加速器上进行的，目的是研究低输出阻抗二次谐波腔的空间电荷效应。2005年8月，我们成功地为LOI系统提供了所需的12.6kV/间隙的射频电压：频率为50 Hz，扫描范围为2.6 ~ 6.2MHz，输出阻抗小于30欧姆。尽管驱动级的波形失真问题仍有待解决，但LOI系统几乎可以安装到ISIS同步加速器上进行束流测试。然而，在2006年，RAL提出了一个关于μ子电离冷却实验的新项目（MICE项目）。到目前为止，我们使用的实验区是分配给这个项目的，我们别无选择，只能搬到其他地方。ISIS设施的2号大厅经过翻新，以容纳我们的LOI系统。2006年10月开始了LOI的移动和所有电源线和控制线的重新布线。截至2007年3月底，这些工作已经完成。因此，无法进行拟议的实验研究：预计在2007财政年度或以后进行束流实验。

项目成果

Low-impedance RF system with a new type of feedback amplifier for a high-intensity synchrotron under heavy beam loading.

具有新型反馈放大器的低阻抗射频系统，适用于重光束负载下的高强度同步加速器。

• 发表时间: 2006
• 期刊: Nuclear Instruments and Methods in Physics Research A 565
• 作者: T.Oki;Y.Irie;S.Takano;LOI collaboration team.
• 通讯作者: LOI collaboration team.

Cascaded Integrator Comb Filters with Smoothly Varying Coefficients for Reduced Delay in Synchrotron Feedback Loops

具有平滑变化系数的级联积分器梳状滤波器，可减少同步加速器反馈环路中的延迟

• 发表时间: 2005
• 期刊: Physical Review Special Topics-Accelerators and Beams 8・122001
• 作者: A.Schnase;M.Nomura;F.Tamura;M.Yamamoto;S.Anami;E.Ezura;K.Hara;C.Ohmori;A.Takagi;M.Yoshii
• 通讯作者: M.Yoshii

Low-impedance RF system with a new type of feedback amplifier for a high-intensity synchrotron under heavy beam loading

具有新型反馈放大器的低阻抗射频系统，适用于重束流负载下的高强度同步加速器

• 发表时间: 2006
• 期刊: Nuclear Instruments and Methods in Physics Research A 565
• 作者: T.Oki;Y.Irie;S.Takano;LOI collaboration team
• 通讯作者: LOI collaboration team

Wideband low-out put-impedance RF system for the second harmonic cavity in the ISIS synchrotron

ISIS同步加速器二次谐波腔的宽带低输出阻抗射频系统

• 发表时间: 2006
• 期刊: Proc. of European Particle Accelerator Conference
• 作者: Y.Irie;J.Dooling;D.Horan;R.Kustom;M.Midde ndorf;G.Pile;D.Bayley;G.Cross;I.Carder;M.Glover;D.Jenkins;A.Morris;A.Seville;S.Sto neham;J.Thomason;T.Western;S.Fukumoto;K.Muto;T.Oki;A.Takagi;S.Takano
• 通讯作者: S.Takano

Wideband low-output-impedance RF system for the second harmonic cavity in the ISIS synchrotron.

用于 ISIS 同步加速器中二次谐波腔的宽带低输出阻抗射频系统。

• 发表时间: 2006
• 期刊: Proc. of European Particle Accelerator Conference 2006
• 作者: Y.Irie;J.Dooling;D.Horan;R.Kustom;M.Middendorf;G.Pile;D.Bayley;G.Cross;I.Garder;M.Glover;D.Jenkins;A.Morris;A.Seville;S.Stoneham;J.Thomason;T.Western;S.Fukumoto;K.Muto;T.Oki;A.Takagi;S.Takano
• 通讯作者: S.Takano