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A transverse bunch by bunch feedback system for Pohang Light Source upgrade

机译：横向逐束反馈系统用于浦项光源升级

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摘要

The Pohang Light Source upgrade (PLS-II) project has successfully upgraded the Pohang Light Source (PLS). The main goals of the PLS-II project are to increase the beam energy to 3 GeV, increase the number of insertion devices by a factor of two (20 IDs), increase the beam current to 400 mA, and at the same time reduce the beam emittance to below 10 nm by using the existing PLS tunnel and injection system. Among 20 insertion devices, 10 narrow gap in-vacuum undulators are in operation now and two more in-vacuum undulators are to be installed later. Since these narrow gap in-vacuum undulators are most likely to produce coupled bunch instability by the resistive wall impedance and limit the stored beam current, a bunch by bunch feedback system is implemented to suppress coupled bunch instability in the PLS-II. This paper describes the scheme and performance of the PLS-II bunch by bunch feedback system.
机译：浦项光源升级（PLS-II）项目已成功升级了浦项光源（PLS）。 PLS-II项目的主要目标是将电子束能量增加到3 GeV，将插入设备的数量增加两倍（20个ID），将电子束电流增加到400 mA，同时减小通过使用现有的PLS隧道和注入系统，电子束的发射率可降至10 nm以下。在20个插入设备中，目前正在运行10个窄间隙真空起伏器，稍后将再安装两个真空起伏器。由于这些窄间隙真空起伏器最有可能通过电阻壁阻抗产生耦合束不稳定性并限制存储的束电流，因此实施了逐束反馈系统以抑制PLS-II中的耦合束不稳定性。本文通过束反馈系统描述了PLS-II束的方案和性能。

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