Speaker
Description
Modern large-scale magnetic confinement fusion devices use divertors to optimize particle and heat exhaust. At the Wendelstein 7-X stellarator (W7-X), this is achieved with an Island Divertor concept, where magnetic islands guide particles and heat along field lines to dedicated target plates. Given the 3D-nature of the island divertor geometry, a large part of the island needs to be diagnosed to assess and quantify transport, which is challenging with the current set of W7-X diagnostics. To address this, the newly installed MANTIS imaging system will be combined with helium gas puffs in upcoming experimental campaigns to provide localized, targeted measurements of island plasma parameters in order to infer transport dynamics.
To support the implementation, simulation studies were conducted using the EMC3-EIRENE plasma fluid transport code. A new synthetic forward modeling tool was developed to predict the performance and operational viability of MANTIS. In addition, we incorporate data from existing W7-X diagnostics, including helium puff spread, electron temperature, and density profiles, into the analysis to provide as much data and realistic plasma parameters for the evaluation. The resulting predictions enable optimized design and deployment of the MANTIS system. This contribution presents the simulation results, performance predictions for MANTIS, and the current status of its integration into W7-X.