Potential design problems for ITER fusion device

Area of Science:

• Nuclear Fusion Engineering
• Plasma Physics
• Computational Modeling

Background:

• The International Thermonuclear Experimental Reactor (ITER) aims to demonstrate commercial fusion energy feasibility using tokamak technology.
• Tokamak designs rely on magnetic fields to confine high-temperature plasma for fusion reactions.
• Plasma disruptions and edge-localized modes (ELMs) pose significant challenges due to sudden energy releases and high power loads.

Purpose of the Study:

• To assess the performance and integrity of ITER's plasma-facing components (PFCs) during transient events like ELMs and disruptions.
• To identify potential design flaws in current ITER components through advanced simulations.
• To inform necessary modifications or innovative designs for ensuring reactor safety and operational success.

Main Methods:

• Comprehensive, state-of-the-art computer simulations of the entire ITER interior.
• Utilizing the HEIGHTS computer package for detailed analysis.
• Simulating ITER's full and exact 3D geometry, incorporating relevant physical processes during transient events.

Main Results:

• Simulations indicate potential serious problems with the current design of ITER's plasma-facing components (PFCs).
• High transient power loads during ELMs and disruptions can exceed design tolerances.
• The current ITER divertor design may be inadequate for preventing structural damage.

Conclusions:

• The current ITER divertor design may not withstand the extreme conditions of plasma disruptions and ELMs.
• Significant modifications or novel designs are likely required for ITER's PFCs.
• Ensuring the robustness of PFCs is critical for the successful operation of fusion energy reactors.