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选择了一台商业化的前端电子学RFTF(radio frequency front-end for transverse feedback system)用于BEPCII横向束流反馈系统, 这是跟进世界先进加速器技术的具体实施。在BEPC同步运行模式下对RFTF的性能进行了测试实验,结果表明使用RFTF可以得到理想的波形,能够满足BEPCII横向反馈系统的需要,但是,当储存环出现不稳性时,系统无法正常工作,这就要求BEPCII纵向不稳定很小或者用纵向反馈系统来抑制存在的纵向不稳定。 相似文献
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BEPCII是一个多束团、大流强的装置, 由于高频腔的高次模和电阻壁阻抗等因素,不可避免地会出现束流不稳定性。BEPCII中采用束流反馈系统来抑制束流不稳定性。横向束流反馈系统主要包括前端电子学、信号处理电子学、反馈器件和放大器等几个部分。梳状滤波器是信号处理电子学的重要部件,利用两根长短不同的电缆以及一个功分器和合成器构成了一种简单有效的梳状滤波器,其梳状深度达到-41 dB,使用这种梳状滤波器的横向反馈系统成功地抑制了束流中出现的不稳定性。 相似文献
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BEPCII是一个多束团、大流强的装置, 由于高频腔的高次模和电阻壁阻抗等因素,不可避免地会出现束流不稳定性。BEPCII中采用束流反馈系统来抑制束流不稳定性。横向束流反馈系统主要包括前端电子学、信号处理电子学、反馈器件和放大器等几个部分。梳状滤波器是信号处理电子学的重要部件,利用两根长短不同的电缆以及一个功分器和合成器构成了一种简单有效的梳状滤波器,其梳状深度达到-41 dB,使用这种梳状滤波器的横向反馈系统成功地抑制了束流中出现的不稳定性。 相似文献
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为了提高注入束流的积累,抑制由于注入系统误差引起较大的β残余振荡是非常有必要的。较系统地介绍了利用合肥光源逐圈测量(turn by turn)系统[1],研究束流不稳定性,并给出了抑制注入β振荡的反馈系统设计原理和线路及初步实验结果。作为原理论证和预研,使用了一个相对简单的模拟滤波移相器对Kicker过程激发的β振荡进行反馈,得到了明显的对damping时间和振荡幅度的抑制作用,为以后低频和高频逐束团(bunch by bunch) 反馈系统研制和抑制束流的横向和纵向不稳定性的研究打下了良好的基础。 相似文献
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用高频结构模拟程序HFSS优化设计条带电极kicker并计算了它的反射参数和横向分流阻抗。从模拟得到的反射参数可以看出,在要求的250MHz带宽范围内, 反射的功率小于7%,说明了条带与功率传输线是阻抗匹配的;模拟得到的横向分流阻抗与公式计算得到的结果基本上一致。当频率250MHz时,得到了1 300Ω的分流阻抗,在此种条件下,需要反馈功率为123W方能抑制束流不稳定性,这为电极的机械设计和在反馈系统中选择功率放大器提供了最基本的依据。 相似文献
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The Beijing Electron and Positron Collider II (BEPCII) is a double ring electron positron collider, which can also be used as a synchrotron radiation (SR) light source. Since the BEPCII will start commissioning with SR mode in November 2006, it is essential to have a satisfying SR lattice. Here we first perform frequency map analysis on the original BEPCII SR lattice. The result shows that the resonance is really severe in the lattice and the transverse motion of particles is unstable. Then a new SR lattice is designed to obtain a large dynamic aperture and much more stable transverse motion. The dynamic aperture of the new lattice including nonlinear wiggler effect is calculated to be very good. This new SR lattice can be used in the commissioning stage of the BEPCII. 相似文献
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Jackson E. A. Ketterer F. D. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1974,2(4):215-221
An application is made of lumped feedback to achieve stability of a distributed electromechanical system. A conducting elastic wire, placed in an axial magnetic field and carrying a current, exhibits instability at a certain threshold of magnetic pressure. The two dimensional transverse displacement of the wire is sampled and these signals are used to produce proportional feedback forces which allow stable equilibrium to be restored. A stability diagram is determined indicating the minimum feedback force to prevent static instability. For one station feedback, there is a maximum allowable feedback to prevent overstabil1 ity. In addition, the maximum value of destabilizing force which can be stabilized is somewhat less than that required for the second mode to become unstable. The wave dynamics of this corkscrew instability are related to several types of electromechanical interaction. The pinch confinement of a plasma, proposed as a scheme for containing a controlled thermonuclear reaction, suffers from a similar corkscrew instability. 相似文献
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