Energy Deposition Studies for the Hi-Lumi LHC Inner Triplet Magnets

TL;DR

This study models the energy deposition in the Hi-Lumi LHC inner triplet magnets using advanced simulation tools, ensuring safe operation and assessing radiation doses for future high-luminosity conditions.

Contribution

The paper presents a comprehensive simulation model of the upgraded LHC inner triplet region with new magnets and absorbers, validated across two codes for accurate energy deposition predictions.

Findings

Peak power density is below quench limit.

Peak dose in magnet insulators ranges from 20 to 35 MGy.

Results from FLUKA and MARS simulations agree well.

Abstract

A detailed model of the High Luminosity LHC inner triplet region with new large-aperture Nb3Sn magnets, field maps, corrector packages, and segmented tungsten inner absorbers was built and implemented into the FLUKA and MARS15 codes. In the optimized configuration, the peak power density averaged over the magnet inner cable width is safely below the quench limit. For the integrated luminosity of 3000 fb -1, the peak dose in the innermost magnet insulator ranges from 20 to 35 MGy. Dynamic heat loads to the triplet magnet cold mass are calculated to evaluate the cryogenic capability. In general, FLUKA and MARS results are in a very good agreement.