Speaker
Description
The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a next-generation experiment designed for observing ultra-high-energy cosmic rays (UHECRs). Compared to conventional fluorescence detector, FAST features a compact and low-cost design by reducing the number of photomultiplier tubes. This design allows for the deployment of a large number of telescopes, aiming to achieve an unprecedented aperture. Currently, seven FAST prototypes are operated at two sites: three at the Telescope Array experiment and four at the Pierre Auger Observatory.
In this contribution, we report on evaluations of the stereo observation performance of the four FAST prototypes installed at two locations within the Pierre Auger Observatory using simulations. We address the expected annual event rate and the reconstruction resolution and bias for geometry, energy and $X_{\mathrm{max}}$. Furthermore, there is a future plan to install two additional prototypes at a third location at the Pierre Auger Observatory to form a FAST mini array. We also present the performance evaluation for this configuration based on simulations.
