isruption loads disruption mitigation and runaway electron avoidance Disruption Avoidance amp Prediction Disruption Mitigation Halo current loads incl asymmetric are sufficiently mitigated by highZ injection ID: 1045395
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1. Disruption LoadsStatus of R&D for ITER disruption loads, disruption mitigation and runaway electron avoidanceDisruption Avoidance & PredictionDisruption MitigationHalo current loads (incl. asymmetric) are sufficiently mitigated by high-Z injectionGaps in the physics basis for thermal load mitigation efficiency (up to 90% radiation is required in ITER) and for radiation asymmetries that could cause first wall meltingThermal load mitigation has to be compatible with runaway avoidance and eddy current load limits (fast current quench) – to be confirmed!Runaway mitigation scheme is not yet confirmed, most promising candidate: high-Z scattering further modelling & experimental efforts are required!Input required for the ITER Disruption Mitigation System before the final design review 2017Gaps in physics basis to be mitigated by a flexible system (injector types, sequence,…)All ITER components have been conservatively designed from current knowledge on loadsGaps in the physics basis on - asymmetric events: cause, amplitude and rotationGaps in the physics basis on - runaway generation and related heat loadsOpen issues to be addressed in modelling & experiments to prepare ITER operationAvoidance (and mitigation) scenarios to be more intensively implemented in routine operation at present devices: gain experience on efficiency and reliabilitydata-driven approaches reach high reliability (require learning, sensitive to scenario changes)physics based (portable) threshold detector to be developedMitigation requires prediction with high success rate:ITPA tasksITPA taskITPA task