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MPPE071 Einstein's General Relativity Effects on Beam Dynamics in a Storage Ring storage-ring, pick-up 3834
  • D. Dong, C.G. Huang, Z. Zusheng
    IHEP Beijing, Beijing
  Funding: The work is supported by National Science Foundation of China under Grant No. 10475094.

In this paper we will discuss Einstein's tide force predicted by Einstein's general relativity, how the new tide force would affect the beam orbits in a storage ring, and how to pick up and recognize it from the beam signals in a storage ring. The result shows this effect can be accumulated by the charged particle beam in a storage ring, it is a very interesting result.

MPPP004 LHC Orbit Stablisation Tests at the SPS feedback, optics, quadrupole, collimation 886
  • R.J. Steinhagen, J. Andersson, L.K. Jensen, O.R. Jones, J. Wenninger
    CERN, Geneva
  The LHC presently build at CERN is the first proton collider that requires a continuous orbit control for safe and reliable machine operation. A realistic test of the orbit feedback system has been performed in 2004 using already present LHC instrumentation and infrastructure on a 270 GeV coasting beam in the SPS. It has been demonstrated that the chosen feedback architecture can stabilise the beam better than 10 micrometre and is essentially limited by the noise of the beam position monitor and the bandwidth of the corrector magnets. The achieved orbit stability is comparable to those found at modern light sources and gives enough operational margin with respect to the requirements of the LHC Cleaning System (70 micrometre). Estimates for the long term drifts and achievable stability will be presented based on the experimental results.  
MPPP006 Performance Calculation on Orbit Feedback for NSLSII feedback, power-supply, closed-orbit, dipole 1036
  • L.-H. Yu
    BNL, Upton, Long Island, New York
  We discuss the preliminary calculation on the performance of closed orbit feedback system for NSLSII, its relation to the requirement on BPM, floor and girder stability, power supply stability, etc.  
RPPP014 Multi-Bunch Simulations of the ILC for Luminosity Performance Studies simulation, luminosity, feedback, linac 1368
  • G.R. White
    Queen Mary University of London, London
  • D. Schulte
    CERN, Geneva
  • N.J. Walker
    DESY, Hamburg
  Funding: This work is supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.

To study the luminosity performance of the International Linear Collider (ILC) with different design parameters, a simulation was constructed that tracks a multi-bunch representation of the beam from the Damping Ring extraction through to the Interaction Point. The simulation code PLACET is used to simulate the LINAC, MatMerlin is used to track through the Beam Delivery System and GUINEA-PIG for the beam-beam interaction. Included in the simulation are ground motion and wakefield effects, intra-train fast feedback and luminosity-based feedback systems. To efficiently study multiple parameters/multiple seeds, the simulation is deployed on the Queen Mary High-Throughput computing cluster at Queen Mary, University of London, where 100 simultaneous simulation seeds can be run.