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

我们研制了世界上第一台质子固定场交替梯度(FFAG)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，我们用高磁导率的磁性合金构建了新型射频腔的POP(原理证明)FFAG。2002年，POP FFAG对质子束有加速作用。理论上，由于固定磁场的作用，FFAG可以在较高的重复频率下加速束流。我们演示了1毫秒内的加速，其中质子从50keV加速到500keV。为了研究POP FFAG的基本性能，从实验上验证了POP FFAG的零色度特性。零色度是FFAG加速器的一个重要特性，这意味着在加速过程中倍他电子管的调谐不会改变。不仅在注入阶段通过…测量了倍他电子管的音调在加速过程中也有更多的t。采用射频敲击法进行了测量。此外，新开发和安装了用于测量的电极。实验证明，在50keV~500keV的能量范围内，电子束流的调谐几乎保持不变。针对具有强非线性场的束流传输系统的束流动力学，尝试了水平动态孔径的测量方法。数值模拟结果表明，POP FFAG的水平接受比常规同步加速器的水平接受大1~2个数量级，并进行了水平接受的间接测量，结果与模拟结果吻合。为了直接测量接收度，研制了一种能同时测量束流位置和角度的新型束流位置监测仪。相空间中的光束运动可望直接观察到。显示器本身的研制有很多研发问题，但已经完成了研发，并将显示器安装在POP FFAG中。目前，动态孔径的直接测量已取得初步结果。较少

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