EUSO@TurLab project in view of Mini-EUSO and EUSO-SPB2 missions

The TurLab facility is a laboratory, equipped with a 5 m diameter and 1 mdepth rotating tank, located in the fourth basement level of the PhysicsDepartment of the University of Turin. In the past years, we have used thefacility to perform experiments related to the observations of Extreme EnergyCosmic Rays (EECRs) from space using the fluorescence technique for JEM- EUSOmissions with the main objective to test the response of the trigger logic. Inthe missions, the diffuse night brightness and artificial and natural lightsources can vary significantly in time and space in the Field of View (FoV) ofthe telescope. Therefore, it is essential to verify the detector performanceand test the trigger logic under such an environment. By means of the tankrotation, a various terrestrial surface with the different opticalcharacteristics such as ocean, land, forest, desert and clouds, as well asartificial and natural light sources such as city lights, lightnings andmeteors passing by the detector FoV one after the other is reproduced. The factthat the tank located in a very dark place enables the tests under an opticallycontrolled environment. Using the Mini-EUSO data taken since 2019 onboard theISS, we will report on the comparison between TurLab and ISS measurements inview of future experiments at TurLab. Moreover, in the forthcoming months wewill start testing the trigger logic of the EUSO-SPB2 mission. We report alsoon the plans and status for this purpose.