2025/02/03 by Patrick Krkotić, Krkotić, P., Elena Bez +15
Engineering · Materials Science · #Accelerator Physics (physics.acc-ph) #Advanced X-ray and CT Imaging #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Fusion materials and technologies
paper · pdf · doi:10.48550/arxiv.2502.01392
openalex publication_date 2025/02/03 · openalex created_date 2025/02/06 · openalex updated_date 2026/07/30
The presence of strong electron clouds in the quadrupole magnetic field regions of the Large Hadron Collider (LHC) leads to considerable heating that poses challenges for the cryogenic cooling system, and under certain conditions to proton beam quality deterioration. Research is being conducted on laser-treated inner beam screen surfaces for the upgraded High-Luminosity LHC to mitigate this issue. Laser-induced surface structuring, a technique that effectively roughens surfaces, has been shown to reduce secondary electron emission; an essential factor in controlling electron cloud formation. Conversely, the resulting surface roughening also alters the material's surface impedance, potentially impacting beam stability and increasing beam-induced resistive wall heating. Different laser treatment patterns have been applied to LHC beam screens to estimate this potential impact and assessed for their microwave responses.