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Charge exchange recombination spectroscopy at Wendelstein 7-X
O P Ford1, L Vanó1, J A Alonso2
1Max-Planck Institut für Plasmaphysik, 17491 Greifswald, Germany.
The Charge Exchange Recombination Spectroscopy (CXRS) diagnostic system on Wendelstein 7-X (W7-X) provides detailed plasma measurements. Initial results showcase ion temperature, flow, electric fields, and impurity densities crucial for fusion energy research.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Spectroscopy
Background:
- Charge Exchange Recombination Spectroscopy (CXRS) is a standard diagnostic in high-temperature fusion devices.
- The Wendelstein 7-X (W7-X) stellarator requires advanced diagnostics for plasma characterization.
Purpose of the Study:
- To detail the design of an extensive and flexible CXRS diagnostic system for W7-X.
- To present initial measurements of key plasma parameters using the W7-X CXRS system and neutral beam heating.
Main Methods:
- Implementation of a highly flexible and extensive CXRS diagnostic system.
- Utilizing neutral beam heating to enable CXRS measurements.
- Analysis of spectral data for ion temperature, velocity, beam attenuation, and impurity densities.
Main Results:
- Acquisition of high-resolution local measurements of plasma parameters.
- Presentation of ion temperature profiles across various heating scenarios.
- Derivation of toroidal flow, radial electric field, beam attenuation, and normalized impurity density profiles.
Conclusions:
- The W7-X CXRS system is successfully providing crucial data for stellarator research.
- The diagnostic capabilities are vital for understanding and optimizing plasma conditions in fusion devices.
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