BEPCⅡ横向束流反馈系统条带电极的设计及模拟计算
Design and simulation of the stripline kicker for the BEPCⅡ transverse feedback system
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摘要: 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。Abstract: Active feedback systems are required to suppress CBI in BEPCⅡ. The BEPCⅡ transverse feedback system mainly includes three parts:the signal detection, the signal process and the kicker as the key part. The magnitude of feedback power is a very important parameter that is closely related to the design of the kicker. The stripline electrodes are used as the kicker in BEPCⅡ. In this paper the numeric modelling by means of the Hewlett&Packard high frequency structure simulation code and the simulation result of the kicker is given. The simulation result is almost same as the result coming from the formula and the reflection coefficient is less than 7 percent in the bandwidth of DC250MHz, the 1 300Ω shunt impedance can be achieved in the frequency of 250MHz, so 123 watts feedback power shoul
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Key words:
- coupled bunch instabilites(cbi) /
- transverse feedback system /
- stripline kicker /
- shunt impedance /
- hfss
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