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Novel dual-reflection design applied for ITER core x-ray spectrometer.

Zhifeng Cheng1, Amro Bader2, Maarten De Bock3

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A new dual-reflection configuration for the International Tokamak Experimental Reactor (ITER) core x-ray spectrometer, the X-Ray Crystal Spectroscopy Core (XRCS-Core), enhances space fitting and radiation dose reduction. It uses graphite reflectors for improved performance in fusion plasma diagnostics.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics
  • X-ray Spectroscopy

Background:

  • The International Tokamak Experimental Reactor (ITER) requires advanced diagnostic tools for plasma analysis.
  • Existing x-ray spectrometers face challenges with space constraints and radiation exposure within the ITER environment.

Purpose of the Study:

  • To introduce a novel dual-reflection configuration for the ITER core x-ray spectrometer, named X-Ray Crystal Spectroscopy Core (XRCS-Core).
  • To optimize the system for observing spectral lines from seeded xenon and intrinsic tungsten impurities.
  • To ensure the spectrometer meets port integration needs and measurement requirements within ITER.

Main Methods:

  • A dual-reflection configuration utilizing highly oriented pyrolytic graphite as the front reflector.
  • A combination of reflector-deflected and direct Lines of Sight (LOSs).
  • Spectral performance simulation using the analytical-raytracing mixed code XRSA.

Main Results:

  • The XRCS-Core system successfully fits allocated space and reduces detector radiation dose.
  • Highly oriented pyrolytic graphite offers higher x-ray throughput and better misalignment tolerance than perfect crystals.
  • Simulations show good imaging quality and a spectral resolution exceeding 8000.

Conclusions:

  • The XRCS-Core system is a viable solution for ITER's core x-ray spectroscopy needs.
  • The design accommodates space limitations and radiation reduction requirements.
  • The system's applicability across various ITER scenarios is supported by performance assessments.