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The Fine Structure of the Longitudinal Machine Impedance Observed with Single Bunches

机译:单束观察到的纵向机械阻抗的精细结构

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摘要

Using a beam spectrum measurement the detailed structure of the CERN SPS longitudinal machine impedance has been observed over a wide frequency range. Single high intensity proton bunches were injected into the machine with RF off. The spectrum of the unstable bunch modes, produced by the different resonant impedances in the ring, was measured during slow debunching. The maximum mode amplitude as a function of frequency was recorded for many injected bunches. The central frequency of each bunch mode is close to the resonant frequency of the impedance and the width depends upon the bunch length. Using sufficiently long bunches allowed the machine impedance to be seen in detail in the frequency range 100MHz to 4GHz. The low frequency of this range is defined by the initial stable bunch spectrum, and the high frequency by the vacuum chamber cut-off frequency. The dominant peaks in the spectrum have been identified with different impedance sources in the machine - some previously unknown.
机译:使用光束频谱测量,可以在很宽的频率范围内观察到CERN SPS纵向电机阻抗的详细结构。在关闭射频的情况下,将单个高强度质子束注入机器。在慢速反包扎期间测量由环中不同的谐振阻抗产生的不稳定束模式的频谱。记录了许多注入束的最大模态振幅与频率的关系。每个束模式的中心频率接近阻抗的谐振频率,宽度取决于束长度。使用足够长的束可以在100MHz至4GHz的频率范围内详细查看机器阻抗。该范围的低频由初始稳定束频谱定义,而高频由真空室截止频率定义。频谱中的主要峰值已通过机器中的不同阻抗源进行了识别-有些以前是未知的。

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