DAPNIA-05-229 |
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Effect of the undulator in IR4 on the LHC beam |
F. Méot, A. Verdier |
An undulator is installed in IR4 to produce synchrotron radiation. The perturbation it introduces in LHC is examined. It has little effect on the closed orbit, a negligible effect on the tune. Its intrinsic non-linearities are negligible (analysis by ray tracing). Specifications on the multipole content of its integrated field are given to produce no effect on the dynamic aperture. |