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Chevron beam dump for ITER edge Thomson scattering system.

E Yatsuka1, T Hatae, G Vayakis

  • 1Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan.

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|November 5, 2013
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Summary
This summary is machine-generated.

The ITER Thomson scattering beam dump uses a chevron design to withstand harsh conditions, extending its operational lifetime. This design optimizes energy distribution, ensuring durability against thermal and electromagnetic loads for the ITER project.

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Area of Science:

  • Fusion energy research
  • Plasma physics
  • Optical engineering

Background:

  • The ITER project requires robust systems for plasma diagnostics.
  • The edge Thomson scattering system needs a durable beam dump to handle intense laser and plasma interactions.
  • Existing beam dump designs face challenges with thermal, electromagnetic loads, and space constraints.

Purpose of the Study:

  • To design and analyze the lifetime of a beam dump for the ITER edge Thomson scattering system.
  • To optimize the beam dump structure for enhanced durability under operational stresses.
  • To assess the impact of design modifications on performance and longevity.

Main Methods:

  • Estimation of beam dump lifetime using multi-pulse laser-induced damage thresholds.
  • Structural optimization using a chevron design with bent sheets to mitigate energy concentration.
  • Analysis of thermal loads (nuclear heating, plasma radiation) and electromagnetic loads during disruptions.
  • Evaluation of stray light and absorbed laser energy profiles, assuming a specific bi-directional reflection distribution function (BRDF).

Main Results:

  • The chevron beam dump design effectively avoids concentrated laser pulse energy.
  • The optimized structure is projected to withstand expected thermal and electromagnetic loads throughout the ITER project.
  • The analysis identified critical issues for lifetime assessment, including BRDF variations due to plasma-derived particle interactions.

Conclusions:

  • The chevron beam dump design offers a viable solution for the ITER edge Thomson scattering system.
  • Further research is needed to resolve uncertainties related to BRDF variations for precise lifetime predictions.
  • The design provides a reasonable margin for peak beam profile factors, ensuring operational reliability.