Résumé du preprint DAPNIA-05-229

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.
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