Improvements in curing coupled bunch instabilities at ELETTRA by mode shifting after the installation of the adjustable higher order mode frequency shifter (HOMFS)

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI:10.1109/PAC.1997.750820

M. Svandrlik, A. Fabris, C. Pasotti

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引用次数: 7

Abstract

Mode shifting is the technique used at the third generation synchrotron light source ELETTRA to cure Coupled Bunch instabilities (CBI). Temperature tuning of the RF cavities, based on an analytical prediction algorithm, allows longitudinal stable operating conditions to be obtained. However, once longitudinal stability has been achieved transverse instabilities can be observed, particularly during the energy ramp from 1.0 to 2.0 GeV. There has therefore been the need to extend the flexibility of the mode shifting technique. This has been achieved by the installation of adjustable HOMFS on the storage ring RF cavities. The HOMFS is effective on those longitudinal and transverse cavity Higher Order Modes which are unstable over a wide temperature range, by shifting them out of the operating temperature interval of the cavity. The installation of the HOMFS has improved the reliability and reproducibility of machine operation, also in view of the beam current upgrade.

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安装可调高阶模态移频器(HOMFS)后模移对ELETTRA耦合束不稳定性的改善

模式变换是第三代同步加速器ELETTRA光源用于解决耦合束不稳定性(CBI)的技术。基于分析预测算法的射频腔的温度调谐允许获得纵向稳定的操作条件。然而，一旦达到纵向稳定性，就可以观察到横向不稳定性，特别是在从1.0 GeV到2.0 GeV的能量斜坡期间。因此，需要扩展模式转换技术的灵活性。这是通过在存储环射频腔上安装可调节的HOMFS来实现的。在较宽温度范围内不稳定的纵向和横向腔高阶模态，HOMFS可以有效地将它们移出腔的工作温度区间。HOMFS的安装提高了机器操作的可靠性和再现性，同时也考虑到光束电流的升级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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