Speaker
Description
The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a next-generation cosmic ray experiment aiming to observe cosmic rays above 10$^{19}$ eV with unprecedented statistics. To achieve this, FAST will utilize low-cost, easily deployable, autonomous fluorescence telescopes spread over a detecting area an order of magnitude larger than those of current observatories. We present the current observation status of FAST and the analysis of data taken by prototypes in the northern and southern hemispheres between 2018 and 2024, including preliminary measurements of the $X_{\textrm{max}}$ elongation rate from events observed in coincidence with the Pierre Auger Observatory and Telescope Array experiment. We also report on the development of the second-generation prototype telescopes and their scheduled installation as part of a “FAST mini-array” in 2025.
