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Application of AXUV diode detectors at ASDEX Upgrade.
M Bernert1, T Eich1, A Burckhart1
1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany.
The Review of Scientific Instruments
|April 3, 2014
Summary
A new semiconductor detector system in the ASDEX Upgrade tokamak enables precise, fast measurements of plasma radiation. This advancement allows for detailed analysis of radiation events, such as edge localized modes, on unprecedented timescales.
Area of Science:
- Fusion energy research
- Plasma physics
- Tokamak diagnostics
Background:
- Accurate measurement of plasma radiation is crucial for understanding tokamak performance and stability.
- Previous diagnostics had limitations in spectral range, spatial resolution, or temporal response.
- The ASDEX Upgrade tokamak required an improved radiation measurement system for fast transient events.
Purpose of the Study:
- To introduce and validate a new wide-spectral-range radiation diagnostic for the ASDEX Upgrade tokamak.
- To assess the performance and degradation of Absolute eXtended UltraViolet (AXUV) diodes in a tokamak environment.
- To enable absolutely calibrated radiated power measurements on fast timescales.
Main Methods:
- Installation of a 256-line-of-sight semiconductor detector system using AXUV n-on-p diodes.
- Combination of the semiconductor detector system with foil-based bolometry for calibration.
- Analysis of diode sensitivity degradation and its dependence on photon energy.
- Time-dependent calibration of the diodes using foil bolometry data.
- Comparison of quasi-calibrated diode measurements with foil bolometry.
Main Results:
- The new diagnostic provides radiation measurements with 5 μs time resolution over a wide spectral range (1 eV-8 keV).
- Degradation of AXUV diodes in the tokamak environment leads to a photon energy-dependent sensitivity.
- Time-dependent calibration using foil bolometry (limited to <1 kHz) allows for accurate measurements on kHz timescales.
- Measurements from the corrected diodes are assumed valid up to the maximum time resolution of 200 kHz.
Conclusions:
- The newly installed diagnostic system significantly enhances the capability to measure plasma radiation in tokamaks.
- The combination of AXUV diodes and foil bolometry provides accurate, absolutely calibrated radiated power on fast timescales.
- This improved diagnostic enables detailed analysis of fast radiation phenomena, such as edge localized modes.
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