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A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U.

F M Laggner1, A Diallo1, B P LeBlanc1

  • 1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

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|May 3, 2019
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A new real-time (RT) Thomson scattering (TS) system was developed for the National Spherical Torus Experiment Upgrade (NSTX-U). This system enables rapid electron temperature and density measurements, crucial for fusion energy research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • The National Spherical Torus Experiment Upgrade (NSTX-U) requires advanced diagnostics for plasma characterization.
  • Real-time (RT) analysis of plasma parameters is essential for understanding and controlling fusion devices.

Purpose of the Study:

  • To develop and implement a prototype real-time Thomson scattering (TS) analysis system.
  • To enable rapid calculation of electron temperature (Te) and electron density (ne) for the multi-point Thomson scattering (MPTS) diagnostic system at NSTX-U.

Main Methods:

  • Upgraded data acquisition hardware with RT-capable electronics for fast signal digitization.
  • Developed new TS spectrum analysis software for rapid Te and ne calculation.
  • Implemented the RT framework within the MPTS diagnostic system.

Main Results:

  • Successfully tested and benchmarked the RT hardware and software against post-shot evaluations.
  • Achieved end-to-end processing times reproducibly below 17 ms, meeting the 60 Hz laser pulse repetition rate.
  • Demonstrated continuous operation for up to 30 minutes, suitable for long-duration discharges.

Conclusions:

  • The developed RT TS framework is a scalable and effective solution for real-time plasma diagnostics.
  • This system meets the demanding timing requirements of NSTX-U and is adaptable for future fusion devices.
  • The RT analysis provides crucial data for advanced tokamak and stellarator research.