Speaker
Description
In the next few years, during Long Shutdown 3, the LHC will be upgraded to the High-Luminosity LHC (HL-LHC). The HL-LHC will run at a luminosity at least five times higher than the nominal LHC luminosity, which will lead to an unprecedented set of collision data, but will also create major challenges for the detectors in terms of pile-up and radiation level. To cope with the increased luminosity, the CMS detector will be substantially upgraded. This includes a replacement of the complete CMS tracker. The new Phase-2 Inner and Outer Tracker will rely on silicon pixel and strip sensors with increased radiation hardness and spatial resolution.
The Outer Tracker is built from radiation‑hard $p_T$-modules, each containing two closely spaced sensors. Front‑end ASICs perform on‑detector clustering and form “stubs” by correlating hits in the two sensors, selecting candidates compatible with tracks above a programmable $p_T$ threshold. PS (pixel–strip) modules equip the inner high‑occupancy region, and 2S (strip–strip) modules the outer radii, enabling efficient real‑time L1 track finding at up to O(200) interactions per bunch crossing. This contribution summarizes the Outer Tracker layout, module and electronics design, on‑detector stub formation, and recent progress in module production and integration.
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