Technical design report for the CODEX-${\hat{I}}^2$ demonstrator

Abstract

The CODEX-${\hat{I}}^2$ apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, is described, with a particular focus on the design, construction, and installation of the new apparatus.

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