Author: Caron, B.
Paper Title Page
MOPO001 Interaction Point Feedback Design and Integrated Simulations to Stabilize the CLIC Final Focus* 475
 
  • G. Balik, L. Brunetti, G. Deleglise, A. Jeremie, L. Pacquet
    IN2P3-LAPP, Annecy-le-Vieux, France
  • A. Badel, B. Caron, R. Le Breton
    SYMME, Annecy-le-Vieux, France
  • A. Latina, J. Pfingstner, D. Schulte, J. Snuverink
    CERN, Geneva, Switzerland
 
  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.  
 
TUPC023 Status of Ground Motion Mitigation Techniques for CLIC 1048
 
  • J. Snuverink, K. Artoos, C.G.R.L. Collette, F. Duarte Ramos, A. Gaddi, H. Gerwig, S.M. Janssens, J. Pfingstner, D. Schulte
    CERN, Geneva, Switzerland
  • G. Balik, L. Brunetti, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • P. Burrows
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • B. Caron
    SYMME, Annecy-le-Vieux, France
  • J. Resta-López
    IFIC, Valencia, Spain
 
  The Compact Linear Collider (CLIC) accelerator has strong stability requirements on the position of the beam. In particular, the beam position will be sensitive to ground motion. A number of mitigation techniques are proposed - quadrupole stabilisation and positioning, final doublet stabilisation as well as beam based orbit and interaction point (IP) feedback. Integrated studies of the impact of the ground motion on the CLIC Main Linac (ML) and Beam Delivery System (BDS) have been performed, which model the hardware and beam performance in detail. Based on the results future improvements of the mitigation techniques are suggested and simulated. It is shown that with the current design the tight luminosity budget for ground motion effects is fulfilled and accordingly, an essential feasibility issue of CLIC has been addressed.