Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase II project

Study of Robinson instabilities with a higher-harmonic cavity for the HLS phase II project
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HLS二期工程高次谐波腔罗宾逊不稳定性研究

DOI:
10.1088/1674-1137/36/11/018
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发表时间:
2012-11
期刊:
影响因子:
3.6
通讯作者:
Wang Lin
Wang Lin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhao Yu-Ning;Li Wei-Min;Wu Cong-Feng;Wang Lin

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合肥光源二期工程将采用四次谐波“朗道”腔,以抑制合肥储存环的耦合束团不稳定性,提高束流寿命。当储存环以小的动量压缩操作时,不稳定性限制了高次谐波腔的效用。分析模型和模拟结果表明,这种不稳定性是由罗宾逊模式耦合引起的。在解析模型中,我们使用一种算法来考虑罗宾逊不稳定性。为了研究不稳定行为的演变,已经进行了模拟,其中宏观颗粒分布在桶之间。分析建模和模拟都同意谐波腔的无源操作。
In the Phase II Project at the Hefei Light Source, a fourth-harmonic "Landau" cavity will be operated in order to suppress the coupled-bunch instabilities and increase the beam lifetime of the Hefei storage ring. Instabilities limit the utility of the higher-harmonic cavity when the storage ring is operated with a small momentum compaction. Analytical modeling and simulations show that the instabilities result from Robinson mode coupling. In the analytic modeling, we operate an algorithm to consider the Robinson instabilities. To study the evolution of unstable behavior, simulations have been performed in which macroparticles are distributed among the buckets. Both the analytic modeling and simulations agree for passive operation of the harmonic cavity.
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