High-β* Optics Calculus at IP2 for Forward Physics in LHC Runs 3 and 4
Abstract
We present a study of high-β* optics configurations at Interaction Point 2 (IP2) of the Large Hadron Collider (LHC), developed to enable forward and diffractive physics measurements with the ALICE experiment during Runs 3 and 4. Using MAD-X, we designed a β* = 30 m optics scheme that satisfies beam stability and aperture requirements, while offering improved sensitivity to small-angle scattering. The configuration follows the Achromatic Telescopic Squeeze (ATS) optics scheme, originally developed for IP1 and IP5, which provides enhanced control over phase advance and chromaticity. The resulting optics layout enables a forward physics program with continuous data-taking. We also outline possible extensions toward even higher β* values and discuss the implementation roadmap.
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