Fluka Energy Deposition Studies for the HL LHC

The LHC upgrade, planned in about ten years from now, is envisaged to accumulate up to 3000 fb−1 integrated luminosity by running at a peak luminosity of 5×1034 cm−2 s−1 [1]. In order to reach such an ambitious goal, the high luminosity insertions need a major redesign implying a 150 mm aperture low-beta Inner Triplet (IT), a superconducting D1 and new quadrupoles in the Matching Section. Energy deposition studies show that degradation of the coil insulator represents the most challenging issue from the radiation impact point of view. We propose a suitable shielding consisting of a beam screen with several mm tungsten absorbers at mid-planes to guarantee not to exceed a few ten MGy. This will also allow a good margin with respect to the risk of radiation induced quenches.