A seminar given by
Researcher at the Oak Ridge National Laboratory (United States of America)
titled:
Advancing Iterative Synthetic Diagnosis Workflow for Light Impurities on WEST
Abstract: Despite limited poloidal diagnostic coverage in fusion devices, understanding impurity distributions across the poloidal extent is crucial for interpreting experimental results. Our developed iterative synthetic diagnosis workflow provides valuable insights into impurity sources and transport in the main Scrape Off Layer (SOL) plasma. The workflow utilizes uses hydrogenic plasma from a multifluid MHD code as fixed background, allowing an impurity transport code to determine poloidal charge state abundances. These abundances are further processed using the collisional radiative code ColRadPy, which converts them into spectral line intensities. To account for 3D effects such as sight lines and reflections off in-vessel components, we employ Raysect.
By comparing experimental measurements with synthetic results generated by the workflow, we iteratively adjust free parameters in the impurity transport code to achieve consistency between the synthetic and experimental outcomes. Our focus lies on oxygen, assumed to be the primary source of tungsten (W) sputtering, and includes experimental and SOLEDGE SOL power scans conducted on the WEST platform. The constructed synthetic workflow demonstrates good agreement with measured O II emission, offering valuable insights for future measurements of higher charge states.
We gratefully acknowledge the support of the U.S. Department of Energy (DOE) under Grant Numbers DE-SC0014664 and DE-AC05-00OR22725.
