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The figure shows the weighted average LHC arc heat load and the available cooling capacity as a function of bunch population for various values of the maximum secondary emission yield, assuming a photo-electron yield of 5%, photon reflectivity 5% and epsilon_max = 240 eV. Included in the simulation is a large component of elastically scattered electrons, as measured on LHC prototype vacuum chambers in EPA (V. Baglin, I. Collins) |