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Radiated power and soft x-ray diagnostics in the SMART tokamak.

J Salas-Suárez-Bárcena1, L F Delgado-Aparicio2, J Segado-Fernández3

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A new diagnostic system for the small aspect ratio tokamak (SMART) will use soft x-ray emissions to measure plasma properties. This system is designed to characterize radiated power and effective charge (Zeff) for improved fusion energy research.

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Area of Science:

  • Fusion energy research
  • Plasma physics
  • Tokamak diagnostics

Background:

  • The small aspect ratio tokamak (SMART) requires advanced diagnostics for operational control.
  • Characterizing plasma impurities and radiated power is crucial for tokamak performance and stability.

Purpose of the Study:

  • To introduce a synthetic model for characterizing radiated power and soft x-ray emissions in SMART.
  • To validate the feasibility of a multi-energy soft x-ray diagnostic system for SMART.
  • To estimate signal strength for the proposed diagnostic design.

Main Methods:

  • Development of a synthetic model to extract radiated power and effective charge (Zeff) values.
  • Utilizing electron density, temperature, and impurity concentration distributions.
  • Simulating diagnostic performance under SMART's initial operational scenarios (Ip = 100 kA; Bt = 0.1 T) with double-null configuration and varying triangularity.
  • Considering anticipated impurities (C, Fe, O, N) with homogeneous distribution and Zeff values between 1 and 2.

Main Results:

  • The synthetic model successfully extracts radiated power and Zeff values based on plasma parameters.
  • Signal strength estimations indicate the feasibility of the proposed multi-energy soft x-ray diagnostic.
  • The model accounts for various impurity compositions and plasma configurations relevant to SMART operations.

Conclusions:

  • The developed synthetic model is a valuable tool for analyzing soft x-ray emissions and radiated power in SMART.
  • The proposed multi-energy soft x-ray diagnostic system is feasible and crucial for impurity control and plasma characterization in SMART.
  • This work provides a foundation for optimizing diagnostic design and operational strategies in future tokamak experiments.