Speaker
Description
The High-Luminosity Large Hadron Collider (HL-LHC) will mark a new phase of LHC operation, aiming to reach an integrated luminosity of 3000 fb$^{-1}$ over 10 years of operation. A key element to achieve the target luminosity is the beam intensity increase, nearly doubling the number of protons per bunch compared to the initial LHC design. This increases the load on the collimators protecting against beam losses, particularly in the betatron cleaning insertion region (IR7), a multistage collimation system responsible for beam halo cleaning. Particles intercepted here may undergo diffractive scattering and propagate for hundreds of meters, reaching the adjacent dispersion suppressor (DS) sections. To assess the impact of these losses, FLUKA simulations have been performed to predict the power deposition in the superconducting DS magnets on both sides of IR7. Accurate modelling of these losses is essential to ensure safe machine operation and to optimize beam loss monitor thresholds, minimizing unnecessary protective beam dumps. In this contribution, we present shower simulation studies for the latest HL-LHC collimation optics (v1.6), with improved cleaning and impedance in IR7, and compare them to the previous one (v1.5).
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