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Two-dimensional AXUV-based radiated power density diagnostics on NSTX-U.

I Faust1, L Delgado-Aparicio2, R E Bell2

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|November 29, 2014
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New diagnostics on the National Spherical Torus Experiment Upgrade (NSTX-U) tokamak will measure 2D photon emissivity. This enables detailed power balance, impurity transport, and magnetohydrodynamic studies for improved fusion energy research.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics Diagnostics
  • Tokamak Operations

Background:

  • Accurate measurement of radiated power density is crucial for understanding energy losses in tokamaks.
  • Previous diagnostic limitations hindered detailed analysis of 2D poloidal emissivity structures.

Purpose of the Study:

  • To design and characterize new diagnostics for measuring the 2D poloidal structure of total photon emissivity on the NSTX-U tokamak.
  • To enable advanced studies in power balance, impurity transport, and magnetohydrodynamics.

Main Methods:

  • Utilizing multiple AXUV-diode based pinhole cameras at various poloidal locations.
  • Employing tomographic reconstructions to derive local emissivity profiles.
  • Characterizing diagnostic sensitivity through simulations with varying impurity concentrations.

Main Results:

  • The study details the expected layout and response of new radially viewing poloidal arrays.
  • Simulations demonstrate the diagnostic's capability to handle different impurity concentrations.
  • The inverted radiated power profiles will aid in estimating power losses during divertor configuration transitions.

Conclusions:

  • The new diagnostics will provide essential 2D poloidal emissivity data for NSTX-U.
  • This will enhance the understanding of power losses and impurity behavior in fusion devices.
  • The findings will contribute to optimizing tokamak performance and fusion energy development.