Flow induced vibrations of the CLIC X-band accelerating structures

T. Charles, K. Ryan, M. Boland, G. Riddone, A. Samoshkin

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch


Turbulent cooling water in the Compact Linear Collider (CLIC) accelerating structures will inevitably induce some vibrations. The maximum acceptable amplitude of vibrations is small, as vibrations in the accelerating structure could lead to beam jitter and alignment difficulties. A Finite Element Analysis model is needed to identify the conditions under which turbulent instabilities and significant vibrations are induced. Due to the orders of magnitude difference between the fluid motion and the structure's motion, small vibrations of the structure will not contribute to the turbulence of the cooling fluid. Therefore the resonant conditions of the cooling channels presented in this paper, directly identify the natural frequencies of the accelerating structures to be avoided under normal operating conditions. In this paper a 2D model of the cooling channel is presented finding spots of turbulence being formed from a shear layer instability. This effect is observed through direct visualisation and wavelet analysis.

Original languageEnglish
Title of host publicationIPAC 2011 - 2nd International Particle Accelerator Conference
Subtitle of host publicationSan Sebastian, Spain; 4-9 September 2011
Place of PublicationGeneva
PublisherJoint Accelerator Conferences Website (JACoW)
Number of pages3
ISBN (Print)9789290833666
Publication statusPublished - 2011
Event2nd International Particle Accelerator Conference - Kursaal, San Sebastian, Spain
Duration: 4 Sep 20119 Sep 2011
Conference number: 2


Conference2nd International Particle Accelerator Conference
Abbreviated titleIPAC 2011
CityKursaal, San Sebastian

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