Spectroscopic diagnostics for deriving electron temperature and density from an Argon plasma in GyM

The electron temperature (Te) and electron density (ne) are important parameters for characterizing the plasma status in the Scrape-Off-Layer (SOL) and the divertor of magnetically confined fusion devices and investigating its physical and chemical properties in different operating conditions [1]. These parameters are usually derived locally using Langmuir Probes (LP), which are intrusive techniques. Optical diagnostics, such as Optical Emission Spectroscopy (OES), utilizing plasma radiation, offer a non-invasive complementary technique providing extremely powerful insights when supported by an accurate atomic modelling [2, 3]. This work focuses on the implementation of the OES technique to analyze an argon plasma in the linear device GyM and to derive an estimate of the line-of-sight averaged Te and ne.