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Spectroscopic and Collisional Data for Tungsten from 1 eV to 20 keV
Closed for proposals
Project Type
Project Code
F41027CRP
1743Approved Date
Status
Start Date
Expected End Date
Completed Date
27 April 2015Description
Tungsten is the leading candidate for use as wall material in the regions of high heat and particle flux in a fusion reactor and in ITER. However, as an impurity in the plasma tungsten poses severe problems due to its high radiation efficiency. Its properties as a wall material and as an impurity are of great interest and are the subject of present fusion experiments and of numerical simulation. The proposed CRP will generate fundamental experimental and calculated data for radiative and collisional atomic processes involving tungsten ions interacting with plasma. The output of the CRP will support the interpretation of spectroscopic measurements on current and future fusion experiments, the modelling of tungsten in fusion plasma, and the design and optimization of fusion reactor experiments, and will advance the fusion energy research efforts.
Objectives
To increase capabilities of Member States to undertake fusion plasma modelling and simulation of present and future experiments and reactor designs through improved atomic databases, and thereby to contribute to the development of fusion energy generation.
Specific objectives
To generate experimental and calculated data for radiative and collisional processes involving tungsten ions in a fusion plasma environment. Processes include excitation and ionization by electron, photon, and proton impact, auto-ionization, radiative de-excitation and recombination, dielectronic recombination, and charge exchange. Data include cross-sections and spectroscopic signatures.
To gather, generate and evaluate experimental and calculated data for radiative and collisional processes involving tungsten ions in plasma
Impact
CRP focuses on the Tungsten processes with the fusion plasma constituents and with energies ranging from 1 eV up to 20 keV. Both the material and processes as well as the chosen energy range are crucially important present day's metallic fusion devices as well as any future next-step fusion machine, such as ITER.
Relevance
The importance of data for tungsten ions in fusion plasma is due to the use of tungsten as a plasma facing material in fusion experiments including ITER and in future demonstration reactor DEMO. The entire temperature range from ~1 eV in the divertor plasma up to ~20 keV in the ITER plasma core is of interest, and all charge states from neutral up to neon-like and a bit beyond are relevant. Emission from the lowest charge states of tungsten provides a tool for real-time erosion measurements of the plasma-facing components and the use of X-ray lines from highly charged tungsten ions is one approach for temperature measurements in hot core plasma. This CRP has provided data on these aspects but also highlighted gaps in the data.
This CRP built a foundation for the AMD Unit's TM series on "Collisional-radiative properties of Tungsten and Hydrogen in fusion edge plasmas", which has currently formed three Working Groups and a network with plasma modellers, fundamental data providers and experimentalists.