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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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Spatial resolution of the JET Thomson scattering system.

L Frassinetti1, M N A Beurskens, R Scannell

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Summary

The Joint European Torus (JET) enhanced its High Resolution Thomson Scattering (HRTS) diagnostic, significantly reducing spatial smearing. This improvement aids in more accurate plasma pedestal profile analysis in fusion research.

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Area of Science:

  • Fusion Energy Research
  • Plasma Physics
  • Diagnostic Instrumentation

Background:

  • The High Resolution Thomson Scattering (HRTS) diagnostic is crucial for analyzing plasma profiles in fusion devices like JET.
  • Accurate pedestal profile analysis requires precise knowledge of the instrument function, which describes spatial smearing.
  • The original HRTS configuration exhibited significant spatial smearing, impacting analysis reliability.

Purpose of the Study:

  • To calculate the instrument function of the HRTS diagnostic at JET for improved pedestal profile analysis.
  • To present and implement an improved optical design for the HRTS laser input system.
  • To quantify the reduction in spatial smearing achieved by the new optical design.

Main Methods:

  • Calculation of the HRTS instrument function for the original and improved configurations.
  • Implementation of a new optical design for the HRTS laser input system.
  • Application of a forward deconvolution procedure using reconstructed instrument kernels for pedestal analysis.

Main Results:

  • The original HRTS system had a spatial instrument response FWHM of (22 ± 1) mm, dependent on JET plasma magnetic topology.
  • An improved optical design reduced spatial smearing, resulting in an HRTS instrument function with FWHM of approximately (9.8 ± 0.8) mm.
  • The deconvolution procedure yielded good results for both configurations, but reliability decreased for narrow pedestals.

Conclusions:

  • The enhanced HRTS optical design significantly improves spatial resolution for JET plasma diagnostics.
  • Accurate instrument function characterization is vital for reliable pedestal profile analysis, especially with advanced diagnostics.
  • The effectiveness of deconvolution techniques is limited when pedestal features approach the instrument's spatial resolution.