Interaction point feedback design and integrated simulations to stabilize the CLIC final focus

Abstract : The Compact Linear Collider (CLIC) accelerator has strong precision requirements on offset position between the beams. The beam which is sensitive to ground motion needs to be stabilized to unprecedented requirements. Different Beam Based Feedback (BBF) algorithms such as Orbit Feedback (OFB) and Beam-Beam Offset Feedback (BBOF) have been designed. This paper focuses on the BBOF control which could be added to the CLIC baseline. It has been tested for different ground motion models in the presence of noises or disturbances and uses digital linear control with or without an adaptive loop. The simulations demonstrate that it is possible to achieve the required performances and quantify the maximum allowed noise level. This amount of admitted noises and disturbances is given in terms of an equivalent disturbance on the position of the magnet that controls the beam offset. Due to the limited sampling frequency of the process, the control loop is in a very small bandwidth. The study shows that these disturbances have to be lowered by other means in the higher frequency range.
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G. Balik, L. Brunetti, G. Deleglise, A. Jérémie, L. Pacquet, et al.. Interaction point feedback design and integrated simulations to stabilize the CLIC final focus. 2nd International Particle Accelerator Conference (IPAC2011), Sep 2011, San Sebastian, Spain. pp.MOPO001. ⟨in2p3-00628894⟩

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