Speaker
Description
The high intensity and wide energy range of the Large Hadron Collider (LHC), further extended by its high-luminosity upgrade, set great challenges on beam diagnostics. The Beam Gas Curtain (BGC), installed on Beam 1 in 2023, addresses these challenges with a non-invasive profile monitor exploiting the fluorescence induced by the beam in a thin supersonic gas curtain. This contribution reviews the operational experience gained with the instrument, presenting emittance measurements performed continuously over the full machine cycle with proton and lead ion beams, and their cross-validation against the other LHC transverse diagnostics. The most recent developments are then described: the optimisation of the gas curtain width, which improves the spatial resolution, and the first tests with nitrogen, whose higher fluorescence yield is offset by space-charge broadening. The perspectives for the second instrument foreseen for LHC Beam 2 are finally outlined.
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