Active lower order mode damping for the four rod LHC crab cavity

Active lower order mode damping for the four rod LHC crab cavity
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四杆大型强子对撞机蟹腔的主动低阶模式阻尼

DOI:
10.1016/j.nima.2016.11.021
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发表时间:
2017
期刊:
Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子:
--
通讯作者:
Dexter A
Dexter A
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作者:
Dexter A

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为大型强子对撞机计划的高亮度升级需要蟹腔在相互作用点将束团旋转成对齐。它们补偿了接近500μr ad的交叉角度。预计在本地交叉方案中,将在每个IP的两侧连续利用四个蟹腔来实现这种旋转。蟹腔以偶极模式运行,但始终具有可能高于或低于运行模式频率的加速模式。蟹形腔被赋予耦合器以确保不需要的加速模式被强烈地抑制,然而,采用标准做法,这些不需要的模式将总是有一定程度的激励。在这种激发具有随机相位的情况下,它可能会促进束团生长并限制束流寿命。本文提出了一种对蟹腔中不需要的最低加速模式的相位和幅值进行主动控制的方法。本文研究了作为函数腔品质因数和接近共振的抑制程度。
The high luminosity upgrade planned for the LHC requires crab cavities to rotate bunches into alignment at the interaction points. They compensate for a crossing angle near 500 μ r ad. It is anticipated that four crab cavities in succession will be utilized to achieve this rotation on either side of each IP in a local crossing scheme. A crab cavity operates in a dipole mode but always has an accelerating mode that may be above or below the frequency of the operating mode. Crab cavities are given couplers to ensure that unwanted acceleration modes are strongly damped however employing standard practice these unwanted modes will always have some level of excitation. Where this excitation has a random phase it might promote bunch growth and limit beam lifetime. This paper sets out a method for active control of the phase and amplitude of the unwanted lowest accelerating mode in the crab cavities. The paper investigates the level of suppression that can be achieved as a function cavity quality factor and proximity to resonance.
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发表时间: 2007
期刊: 2007 IEEE Particle Accelerator Conference (PAC)
影响因子: --
作者:
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