A novel hydrogenic spectroscopic technique for inferring the role of plasma–molecule interaction on power and particle balance during detached conditions

Abstract Detachment, an important mechanism for reducing target heat deposition, is achieved through reductions in power, particle and momentum; which are induced plasma–atom plasma–molecule interactions. Experimental research how those reactions precisely contribute to detachment limited. Both as well interactions can result excited hydrogen atoms emit atomic line emission. In this work, we investigate a new Balmer Spectroscopy technique Plasma–Molecule Interaction—BaSPMI. This first disentangles the emission from various secondly quantifies their contributions (ionisation recombination) power balance (radiative losses). Its performance verified using synthetic diagnostic techniques of both attached detached TCV MAST-U SOLPS-ITER simulations. We find that H 2 plasma chemistry involving H 2 + and/or ? substantially elevate H? during detachment, show precursor Molecular Activated Recombination. An example illustration analysis full BaSPMI shows hydrogenic series, even Ly? medium-n lines, be significantly influenced by tens ofpercent. That has implications spectroscopy diagnosing divertor plasmas.