Abstract
We discuss new collisional-radiative modeling calculations of tungsten at moderate temperatures of 1200 to 2400 eV. Such plasma conditions are relevant to ongoing experimental work at ASDEX Upgrade and are expected to be relevant for ITER. Our calculations are made using the Los Alamos National Laboratory (LANL) collisional-radiative modeling ATOMIC code. These calculations formed part of a submission to the recent NLTE-8 workshop that was held in November 2013. This series of workshops provides a forum for detailed comparison of plasma and spectral quantities from NLTE collisional-radiative modeling codes. We focus on the LANL ATOMIC calculations for tungsten that were submitted to the NLTE-8 workshop and discuss different models that were constructed to predict the tungsten emission. In particular, we discuss comparisons between semi-relativistic configuration-average and fully relativistic configuration-average calculations. We also present semi-relativistic calculations that include fine-structure detail, and discuss the difficult problem of ensuring completeness with respect to the number of configurations included in a CR calculation.
Highlights
The properties of tungsten are of prime importance for the future of magnetic fusion modeling.Tungsten has been proposed as a plasma-facing device for the ITER machine [1] due to its high melting point, and its low affinity for tritium
We report on collisional-radiative modeling calculations for tungsten made using the Los Alamos ATOMIC plasma kinetics code
In this report we have presented several collisional-radiative modeling calculations for tungsten at temperatures from 1200 to 2400 eV made using the Los Alamos ATOMIC code
Summary
The properties of tungsten are of prime importance for the future of magnetic fusion modeling. It is critical to understand the atomic properties of tungsten and the plasma kinetics that give rise to the radiative losses over the large temperature ranges that will be found in ITER. ASDEX Upgrade in recently reported work [2] In this temperature range, the most abundant tungsten ions contain many electrons in open N-shell configurations, resulting in potentially vast numbers of atomic levels that require consideration. The most abundant tungsten ions contain many electrons in open N-shell configurations, resulting in potentially vast numbers of atomic levels that require consideration This makes the calculation of atomic data and the resulting plasma kinetics modeling extremely complex and computationally intensive. Tungsten has been a test case for many of the non-LTE kinetics workshops [5,6], and the subject of various investigations using EBIT measurements (for example, [7])
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