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

TL;DR

This paper evaluates the luminosity performance of the 380 GeV stage of the Compact Linear Collider, considering static and dynamic imperfections, and finds that realistic conditions still surpass the nominal luminosity target.

Contribution

It provides detailed simulation results of the collider's luminosity performance under realistic imperfections, demonstrating robustness beyond nominal goals.

Findings

Achieves nearly three times the nominal luminosity with perfect collider.

90% of misaligned colliders reach at least 2.35×10^{34} cm^{-2}s^{-1} luminosity.

Realistic imperfections still allow for almost double the nominal luminosity target.

Abstract

The Compact Linear Collider is one of the two main European options for a collider 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 including the impact of static and dynamic imperfections. These calculations are performed with fully realistic tracking simulations from the exit of the damping rings to the interaction point and including beam-beam effects in the collisions. A luminosity of $4.3\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$ can be achieved with a perfect collider, which is almost three times the nominal luminosity target of $1.5\times10^{34}\,\text{cm}^{-2}\text{s}^{-1}$. In simulations 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 nominal luminosity target, this is a surplus of approximately 57%. Including the impact of ground motion, a luminosity surplus of 53% or greater can be expected for 90% of colliders. The average expected luminosity is $2.8\times10^{34}~\text{cm}^{-2}\text{s}^{-1}$, which is almost twice the nominal luminosity target.