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Dual array 3D electron cyclotron emission imaging at ASDEX Upgrade
I G J Classen1, C W Domier2, N C Luhmann2
1FOM-Institute DIFFER, Dutch Institute for Fundamental Energy Research, 3430 BE Nieuwegein, The Netherlands.
The Review of Scientific Instruments
|November 29, 2014
Summary
The upgraded electron cyclotron emission imaging diagnostic now provides quasi-3D electron temperature measurements. This advancement allows for direct observation of 3D plasma instability properties, enhancing fusion energy research.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Diagnostic Technology
Background:
- The ASDEX Upgrade tokamak utilizes advanced diagnostics for plasma research.
- Electron Cyclotron Emission Imaging (ECEI) is crucial for measuring electron temperature profiles.
Purpose of the Study:
- To upgrade the existing 2D ECEI diagnostic at ASDEX Upgrade.
- To enable quasi-3D measurements of electron temperature for enhanced plasma instability analysis.
Main Methods:
- Installation of a second detector array for the ECEI diagnostic.
- Achieving toroidal separation of 40 cm between two 2D detector arrays.
- Simultaneous observation of plasma field lines by both arrays.
Main Results:
- The enhanced ECEI system provides 288 total channels across two 2D arrays.
- Quasi-3D electron temperature measurements are now achievable.
- Direct measurement of 3D plasma instability properties, such as edge localized mode filaments, is enabled.
Conclusions:
- The upgraded ECEI diagnostic significantly advances the capability for 3D plasma analysis.
- This facilitates a deeper understanding of plasma instabilities in fusion devices.
- The new system is vital for optimizing future fusion reactor designs.
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