Towards large databases analysis for reactors-relevant studies on high electron temperature measurement discrepancy

Accurate electron temperature (Te) measurements are critical for future reactors such as ITER, CFETR, and DEMO, where core T e is expected to exceed 25 keV [1-3]. However, in current tokamaks, core electron temperature measurements become increasingly challenging at high values (typically above 6–7 keV), where discrepancies frequently arise between diagnostics such as Thomson Scattering (TS) and Electron cyclotron emission (ECE). These discrepancies highlight both a diagnostic challenge and an opportunity to deepen the understanding of core plasma physics. Recent studies have provided further insights into these phenomena, clarifying key physical aspects, and yielding more substantial results [4-8]. Nevertheless, a broader experimental database remains essential to validate and support the physical hypotheses developed in recent years. This contribution reports on preliminary results obtained from the analysis of the entire JET-DTE3 dataset, providing a status update on our ongoing research. Specifically, we focus on the methodological advancements and the analytical tools recently developed to manage the unprecedented volume of data within the DTE3 database. This framework enables a deep investigation into the T e discrepancy, marking the first time this phenomenon has been systematically studied across such an extensive and statistically significant dataset. This work is conducted within the framework of the International Tokamak Physics Activity (ITPA) JEX#17 on `High Electron Temperature Measurements', which aims to compare data collected across multiple fusion devices to systematically identify the origin of the observed Te discrepancy.