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In-vessel activation monitors in JET: progress in modeling.
Georges Bonheure1, I Lengar, B Syme
1Laboratory for Plasma Physics, Association Euratom-Belgian State, Avenue de la Renaissance 30, B-1000 Brussels, Belgium.
The Review of Scientific Instruments
|December 11, 2008
Summary
New in-vessel activation monitors at JET provide crucial data for fusion energy research. These monitors help address challenges in diagnostic systems for ITER, improving neutron and charged particle measurements.
Area of Science:
- Nuclear Fusion Engineering
- Plasma Physics
- Diagnostic Systems R&D
Background:
- Developing reliable diagnostic systems is critical for future fusion reactors like ITER.
- JET (Joint European Torus) is utilizing advanced techniques to address challenges with lost diagnostics.
Purpose of the Study:
- To evaluate new in-vessel activation monitors for measuring neutron and charged particle fluences.
- To support research and development for ITER's diagnostic systems.
- To assess the effectiveness of a manipulator arm-based sample transport system for activation analysis.
Main Methods:
- Deployment of new in-vessel activation monitors within the JET tokamak.
- Utilizing a manipulator arm for in-situ sample transport and irradiation.
- Selection of long-half-life radionuclides and ultralow background gamma-ray measurements.
- Modification of the MCNP neutron transport model to incorporate activation probe data.
Main Results:
- The new monitors successfully provided data on neutron and charged particle fluences.
- Irradiation closer to the plasma potentially reduced neutron scattering.
- MCNP model calculations accurately reproduced neutron-induced activity on samples.
Conclusions:
- The developed activation monitoring system shows promise for fusion diagnostics R&D.
- This approach could be valuable for ITER's diagnostic calibration strategies.
- The study validates the use of advanced activation monitors and modeling for fusion plasma analysis.
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