Study of Very Precise and Stable Beam Optics Controls in the Next Generation Linear Accelerators

在高能粒子和同步辐射轨道光物理实验中，为了推进高能粒子和同步辐射光物理的研究，需要获取精确的信息。提供高强度和高稳定的粒子束是非常重要的，特别是在新一代的直线对撞机、SASE自由电子激光和强质子直线加速器中。为了满足这些要求，我们研究了一种独特的工具来观察束流的光学质量以及束流和束流的位置，并研究了一种提高束流光学稳定性的方法。建立了八电极束流监测器以及四电极监测器来检索横向束流轮廓信息，这些信息可以转化为束流能量分布和发射度信息。为了提高束流质量的稳定性，对注入到KEKB的束流进行了反馈和监测。为了提高稳定环的响应时间，还研制了一套快速读出系统。这些无损、实时的束流信息加深了我们对光束质量的理解，并与硬件稳定性和尾迹场的非线性束流光学进行了比较。随着控制和仪表系统的发展，对优化算法进行了进一步的研究。

In the high-energy particle and synchrotron-orbit light physics experiments it is demanded to acquire precise information in order to advance their studies. It is important to provide high-intensity and high-stability particle beams especially in the next generation linear accelerators like a linear collider, SASE FEL, and a high-intensity proton linac.In order to meet those requirements we investigated a unique tool to observe the optical quality of beams as well as the beam current and position, and studied a method to improve the stability of the beam optics.Eight-electrode beam monitors were established as well as four-electrode monitors to retrieve, a transverse beam profile information, which can be translated into beam energy spread and emittance information. Thus it acts as a nondestructive beam quality monitor.Feedback and surveillance procedures were installed for the injection beams to KEKB in order to improve the stability of the beam quality. A fast read-out system was also developed to enhance the response time of the stabilization loops.Those nondestructive and real-time beam information advanced our understanding on the beam quality comparing them with hardware stabilities and nonlinear beam optics of wake fields. Accompanied with the developments of the control and instrumentation systems, further optimization algorithms are investigated.