Speaker
Description
During dedicated machine development periods in 2025, the LHC operated with High-Luminosity LHC (HL-LHC) beam parameters to study transverse beam dynamics in a high-intensity and high pile-up regime. For the first time, collisions with trains of $2.3\times10^{11}$~ppb were achieved, reaching a pile-up of 150 and reproducing operational conditions close to those foreseen for the HL-LHC. These experimental tests allowed for detailed measurements of emittance growth and proton losses. In particular, a fill with bunches having different transverse distributions was performed to assess the impact of non-Gaussian tails on beam lifetime and losses beyond the burn-off limit when the two beams are brought into collisions.
Furthermore, the evolution of the beam quality throughout the cycle was studied for different HL-LHC beam types. These results represent a key milestone towards the demonstration of the HL-LHC operational conditions.
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