Three running stellarators are available in the frame of the present project for planning, running and analysis of experiments: TJ-II at CIEMAT, in Spain; the Large Helical Device (LHD) at the National Institute for Fusion Science (NIFS), in Japan; and the Wendelstein 7-X (W7-X) stellarator, at the Max-Planck Institute for Plasma Physics (IPP) in Germany. W7-X is currently under the operation phase OP1.2 [Sunn-Pedersen-15], and it will later undergo an upgrade in preparation of the long-pulse operation phase OP2, which will start in early 2021. The theoretical and computational developments that are subject of this project will allow a first principle interpretative modelling of the transport measurements of the plasma main ions and impurities. In this respect, it is important to highlight that the three devices are equipped with different sets of diagnostics that provide observables particularly suitable for the validation of the simulations.
The following objective is in line with the present task:
- Simulation of the ion heat flux (both turbulent and collisional) in the core of W7-X for several magnetic configurations and the radial particle flux of highly charged impurities with arbitrary concentration for their confrontation with measurements., also exploiting TJ-II and LHD as a test-bed for validating physical mechanisms and modelling tools.
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