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The High Luminosity (HL) upgrade of the Large Hadron Collider (LHC) requires the installation of two new beam dumps capable of safely absorbing energies of up to 710 MJ per beam. The beam dump consists of an 8.4 m long, 700 mm diameter, thin-walled cylinder containing a shrink-fitted internal core made of carbon-based materials. This contribution reports on the critical R&D activities supporting the detailed design of both the dump vessel and the carbon-based core.
The vessel is constructed from Ti-6Al-4V (Grade 5) segments joined circumferentially by electron-beam welding. Extensive fatigue testing has been performed to validate the structural integrity of these welds under the severe vibrational loads induced by beam impact, complemented by fracture-toughness and fatigue-crack-growth characterisation.
For the absorbing materials, the HiRadMat-65 experiment evaluated several candidate core materials under HL-LHC nominal and accident beam-dilution scenarios, with no observable damage, thereby confirming their suitability for HL operation. Together, these results represent key steps toward the final engineering design of the HL-LHC beam dumps.
Research supported by the HL-LHC project.
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