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The Compact Linear Collider is one of the two main European options for acollider in a post Large Hadron Collider era. This is a linear $e^+e^-$collider with three centre-of-mass energy stages: 380 GeV, 1.5 TeV and 3 TeV.The luminosity performance of the first stage at 380 GeV is presented includingthe impact of static and dynamic imperfections. These calculations areperformed with fully realistic tracking simulations from the exit of thedamping rings to the interaction point and including beam-beam effects in thecollisions. A luminosity of $4.3\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$ canbe achieved with a perfect collider, which is almost three times the nominalluminosity target of $1.5\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$. Insimulations with static imperfections, a luminosity of$2.35\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$ or greater is achieved by 90%of randomly misaligned colliders. Expressed as a percentage of the nominalluminosity target, this is a surplus of approximately 57%. Including the impactof ground motion, a luminosity surplus of 53% or greater can be expected for90% of colliders. The average expected luminosity is$2.8\times10^{34}~\text{cm}^{-2}\text{s}^{-1}$, which is almost twice thenominal luminosity target.

Luminosity Performance of the Compact Linear Collider at 380 GeV with Static and Dynamic Imperfections