Research for a high repetitive synchrotron accelerator with the new type of RF cavity using high permeability magnetic alloy

高磁导率磁性合金新型射频腔高重复同步加速器的研究

• 批准号: 11309013
• 负责人: MORI Yoshiharu
• 金额: $ 25.31万
• 依托单位: High energy Accelerator research Organization (KEK)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11309013/
• 关键词: FFAG Acceleralor; Strong focusing; Synchrotron Oscillation; Acceptance; Rapid Repetitive Accelerator; MA RF Cavity; Beam Injection; Dynamic Aperture; 強集束; MA加速空間; シクロトロン振動; 速い繰返しの加速器; MA加速空胴; ダイナミックアバーチャー; シンクロトロン; 粒子加速器; FFAGシンクロトロン; 高周波

We developed the first proton FFAG (Fixed Field Alternating Gradient) accelerator in the world. We had already had the electron FFAG accelerator, but the proton FFAG accelerator had not been realized ever.We constructed the PoP (Proof of Principle) FFAG with the new type of RF cavity using high permeability magnetic alloy. In 2002, PoP FFAG could accelerate the proton beam. In principle, FFAG can accelerate the beam in high repetition rate due to the fixed magnetic field. We demonstrated the acceleration within 1msecwhere the proton accelerated from50keV to500keV. We ensure that the possibility of the acceleration in high repetition rate with FFAG Accelerator.For the studies of the basic performance of the PoP FFAG, the "zero chromaticity" of the PoP FFAG was verified experimentally. The zero chromaticity is an important characteristic for FFAG accelerator, which means that betatron tunes do not change during the acceleration. Betatron tunes were measured not only at injection stage bu … More t also during acceleration. The rf knock-out method was employed for the measurement. In addition, an electrode was newly developed and installed for the measurement. According to the experiment, it was verified that the betatron tunes were kept almost constant in the energy range from 50keV to 500keV. For the beam dynamics of a beam transporting system with strong non-linear field, a measurement of the horizontal dynamic aperturewas tried. Anumerical simulation predicts that the PoP FFAG has horizontal acceptance one or two orders of magnitude larger than that of conventional synchrotron.An indirect measurement of horizontal acceptance has been carried out and the results supported the simulation. To measure the acceptance directly, a new beam position monitor, which can measure the beam position and angle simultaneously, was developed. The beam motion in the phase space is expected to be observed directly. The development of the monitor itself had many R＆D issues, but the development has already been done and the monitor was installed in the PoP FFAG. At present, preliminary results of the direct measurement of the dynamic aperture were obtained. Less

我们研制了世界上第一台质子FFAG（固定场交变梯度）加速器。我们已经有了电子FFAG加速器，但质子FFAG加速器还没有实现，我们用高导磁率的磁性合金构建了新型射频腔的PoP（Proof of Principle）FFAG。2002年，PoP FFAG可以加速质子束。由于固定磁场的作用，FFAG原理上可以实现高重复频率的加速。我们演示了质子从50 keV加速到500 keV的1 ms加速。为保证FFAG加速器在高重复频率下加速的可能性，对PoP FFAG的基本性能进行了研究，实验验证了PoP FFAG的“零色度”特性。零色度是FFAG加速器的一个重要特性，即加速过程中电子感应加速器的调谐不发生变化。Betatron调谐不仅在注入阶段测量， ...更多信息 在加速过程中也是如此。采用rf敲除法进行测量。此外，新开发并安装了用于测量的电极。实验结果表明，在50 ~ 500 keV的能量范围内，电子感应加速器的调谐几乎保持恒定。针对强非线性场束流传输系统的束流动力学问题，尝试了水平动态光阑的测量。数值模拟结果表明，PoP FFAG的水平接受度比常规同步加速器的水平接受度高1 ~ 2个数量级，并对水平接受度进行了间接测量，结果支持了数值模拟。为了直接测量光束质量，研制了一种能同时测量光束位置和角度的光束位置监测仪。束流在相空间中的运动有望被直接观测到。显示器本身的开发有许多研发问题，但开发已经完成，显示器安装在PoP FFAG中。目前，已经取得了动态孔径直接测量的初步结果。少

项目成果

T.Yokoi, et al.: "FFAG Based Neutriono Factory"Proceedings of the Second Asian Particle Accelerator Conference. 127-129 (2001)

T.Yokoi 等人：“基于 FFAG 的中微子工厂”第二届亚洲粒子加速器会议论文集。

M.Fujieda, et al.: "Magnetic alloy loaded RF cavity for barrier bucket experiment at AGS"Proc. of he 1999 Particle Accelerator Conf. (PAC'99). 857-859 (1999)

M.Fujieda 等人：“用于 AGS 障碍桶实验的磁性合金加载 RF 腔”Proc。

M.Yoshiharu: "Multi-orbit synchrotron with FFAG focusing for acceleration of high intensity hadron beams"Proc. of the 1999 Particle Accelerator Conf. (PAC'99). 2271-2273 (1999)

M.Yoshiharu：“具有 FFAG 聚焦的多轨道同步加速器，用于加速高强度强子束”Proc。

Y.Mori, et al.: "Multi-Beam Acceleratkion in FFAG Synchrotron"Proceedings of the 2001 Praticle Acceleratior Conference. ROPA010. 588-590 (2001)

Y.Mori 等人：“FFAG 同步加速器中的多束加速”2001 年实践加速会议论文集。

K.Koba, et al.: "Longitudinal impedance tuner using high permeability material"Proc. of he 1999 Particle Accelerator Conf. (PAC'99). 1653-1655 (1999)

K.Koba 等人：“使用高磁导率材料的纵向阻抗调谐器”Proc。