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Optimization of a bolometer detector for ITER based on Pt absorber on SiN membrane
H Meister1, T Eich, N Endstrasser
1Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching, Germany. meister@ipp.mpg.de
The Review of Scientific Instruments
|November 10, 2010
Summary
Researchers are developing robust bolometer detectors for ITER, capable of withstanding high temperatures and neutron radiation. Initial tests show promising results, with ongoing optimization for enhanced performance in fusion plasma diagnostics.
Area of Science:
- Nuclear Fusion Engineering
- Plasma Diagnostics
- Materials Science
Background:
- ITER requires plasma diagnostics to operate reliably at high temperatures (>200°C) and neutron fluences (0.1 dpa).
- Bolometer diagnostics are crucial for measuring plasma radiation in fusion devices.
Purpose of the Study:
- To develop and test miniaturized metal resistor bolometer detectors for ITER.
- To characterize detector performance under thermal loads and radiation environments.
Main Methods:
- Fabrication of bolometer detectors using platinum absorbers on silicon nitride membranes.
- Laboratory calibration tests up to 450°C.
- In-situ testing in the ASDEX Upgrade tokamak.
Main Results:
- Demonstrated detector functionality under high thermal loads.
- Identified areas for optimization based on ASDEX Upgrade performance.
- Implemented laser trimming to minimize resistance mismatch and thermal drifts.
Conclusions:
- The developed bolometer detectors show potential for ITER applications.
- Further optimization is necessary to meet stringent operational requirements.
- Laser trimming is an effective technique for improving detector stability.
