Modeling linear electron-positron colliders at the interaction point with the exascale code WarpX*

The HEP community has proposed several designs for next linear electron-positron colliders. 

A key challenge is the mitigation of beamstrahlung and the resulting emission of background particles while maximizing the luminosity. To tackle this, we need a comprehensive understanding of the physics at the interaction point, hence high-fidelity modeling of multi-physics processes.

Dedicated particle-in-cell (PIC) codes were developed to study beam-beam collisions and proved to provide robust modeling. In this context, however, there is a need for a state-of-the-art tool that guarantees accurate results along with consistent maintenance, strong performance, portability, advanced data management, and a wide variety of diagnostics.

Here, we introduce WarpX as an upcoming modeling tool in the field of linear lepton colliders. WarpX is an exascale open-source code that serves as a cross-disciplinary simulation environment in various fields of research.

We detail the extended capabilities of WarpX and recent code developments. We present benchmarks against established codes and new large-scale campaigns of different collider configurations. We visualize the features of the collision and explore the role of beamstrahlung and secondary pairs. 

Our results represent a step forward in expanding the capabilities of advanced simulation tools to the HEP community.