A FOrward CALorimeter Upgrade For PHENIX Available to Purchase

Over the past few years, the PHENIX detector has undergone several upgrades in the forward region $(1<|η|<4),$ initially covered only by the muon arms. The focus of these upgrades is toward a better understanding of the Color‐Glass Condensate and the interplay between the different components of the proton’s spin valence/sea quark and gluon contributions. This paper highlights the newly proposed forward calorimeter detector, FOCAL. FOCAL is a tungsten‐silicon sampling calorimeter with high position and energy resolution, covering a pseudorapidity of $1.6<η<2.5.$ This future detector aims to constrain the current view of gluon saturation at small x in the Color‐Glass Condensate framework, through isolation of direct photons at high‐$pT$ over a broad range of pseudorapidity.