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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Deconvolution of Thomson scattering temperature profiles.

R Scannell1, M Beurskens, P G Carolan

  • 1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, United Kingdom. rory.scannell@ccfe.ac.uk

The Review of Scientific Instruments
|June 7, 2011
PubMed
Summary
This summary is machine-generated.

Deconvoluting Thomson scattering (TS) profiles is crucial for accurate electron temperature and density measurements. A new, simplified method requires only the instrument function and observed profiles, making it accessible for various TS systems.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Accurate electron temperature (T(e)) and density (n(e)) profiles are essential for understanding plasma behavior.
  • Deconvolution of Thomson scattering (TS) data is necessary when plasma gradients approach the instrument function's spatial resolution.
  • Existing deconvolution methods at the scattered signal level are complex, requiring extensive calibration data.

Purpose of the Study:

  • To present a simplified deconvolution technique for Thomson scattering profiles.
  • To enable accurate determination of underlying T(e) and n(e) profiles using minimal data.
  • To provide a practical method suitable for systems with high spatial sampling.

Main Methods:

  • The study introduces a novel deconvolution approach.
  • This method utilizes only the instrument function I(r) and the observed T(e, observed)(r) and n(e, observed)(r) profiles.
  • It bypasses the complexity of scattered signal level deconvolution.

Main Results:

  • The proposed technique successfully retrieves underlying T(e)(r) and n(e)(r) profiles.
  • The method is validated for its applicability across diverse TS systems.
  • It proves particularly effective for systems with high spatial resolution relative to the instrument function.

Conclusions:

  • A simplified and effective deconvolution method for TS measurements is established.
  • This technique reduces the complexity and data requirements for obtaining accurate plasma profiles.
  • The method enhances the utility of TS diagnostics, especially in high-resolution scenarios.