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:
影响因子:
--
通讯作者:
Dexter A
中科院分区:
文献类型:
--
作者:
Dexter A
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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DOI:
10.1103/physrevstab.9.064403
发表时间:
2006
影响因子:
--
作者:
D. Douglas;K. Jordan;L. Merminga;E. Pozdeyev;C. Tennant;Haipeng Wang;T. Smith;S. Simrock;I. Bazarov;G. Hoffstaetter
通讯作者:
G. Hoffstaetter
DOI:
10.1103/physrevstab.14.051004
发表时间:
2011
影响因子:
--
作者:
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通讯作者:
K. Hasegawa
DOI:
10.1103/physrevstab.12.101002
发表时间:
2009
影响因子:
--
作者:
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通讯作者:
F. Zimmermann
DOI:
10.1109/pac.2007.4441113
发表时间:
2007
期刊:
2007 IEEE Particle Accelerator Conference (PAC)
影响因子:
--
作者:
F. Zimmermann
通讯作者:
F. Zimmermann