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Neutronics Simulations for DEMO Diagnostics.

Raul Luís1, Yohanes Nietiadi1, Antonio Quercia2

  • 1Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal.

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Summary
This summary is machine-generated.

Developing plasma diagnostic and control systems for future fusion reactors like DEMO requires understanding extreme radiation environments. This study quantifies radiation exposure for various diagnostic integration strategies, aiding in robust system design.

Keywords:
DEMOMCNPdiagnosticsneutronicsnuclear fusiontokamaks

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Area of Science:

  • Nuclear Engineering
  • Plasma Physics
  • Fusion Energy

Background:

  • Future fusion power plants, such as the Demonstration Power Plant (DEMO), face significant challenges due to high radiation levels during long operational periods.
  • Effective plasma diagnostic and control systems are crucial for DEMO's success, but their development is hindered by these harsh conditions.

Purpose of the Study:

  • To provide a comprehensive overview of the expected radiation environment for diagnostics in DEMO.
  • To assess the impact of different integration approaches on diagnostic radiation exposure.
  • To offer crucial data for the design of resilient diagnostic systems.

Main Methods:

  • Neutronics simulations were conducted using the water-cooled lithium lead blanket configuration as a reference.
  • Simulations covered pre-conceptual designs for in-vessel, ex-vessel, and equatorial port diagnostics, representing various integration strategies.
  • Flux and nuclear load calculations were performed for key sub-systems, including estimations of radiation streaming.

Main Results:

  • Different diagnostic integration approaches result in significantly varying radiation exposure levels.
  • Quantified neutron and gamma flux, along with nuclear heating loads, for representative diagnostic components.
  • Identified potential radiation streaming paths to ex-vessel components.

Conclusions:

  • The radiation environment significantly impacts diagnostic design choices for DEMO.
  • Understanding and quantifying these radiation levels is essential for selecting appropriate integration methods and materials.
  • The simulation results serve as a vital reference for diagnostic designers in the DEMO project.