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ITER LIDAR performance analysis.

M N A Beurskens1, L Giudicotti, M Kempenaars

  • 1EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom. marc.beurskens@jet.uk

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

This study verifies core profile measurements for ITER using LIDAR Thomson scattering, achieving high spatial resolution and accuracy. Simulations confirm system viability for electron temperatures above 5 keV, with development needed for lower temperatures.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Optical Diagnostics

Background:

  • Accurate electron temperature and density measurements are crucial for ITER's core plasma understanding.
  • LIDAR Thomson scattering offers high spatial resolution for plasma diagnostics.

Purpose of the Study:

  • To verify the specifications of the core LIDAR Thomson scattering system for ITER.
  • To assess the system's performance across a range of electron temperatures and densities.
  • To evaluate laser and detector combinations for optimal performance.

Main Methods:

  • Utilized a full profile Monte Carlo simulation code to verify system specifications.
  • Assumed specific input and collection transmission values for simulations.
  • Evaluated combinations of Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) lasers and microchannel plate photomultipliers.

Main Results:

  • The system meets spatial resolution (<10% accuracy for T(e)) and accuracy specifications for electron temperatures above 5 keV.
  • A Nd:YAG laser combined with specific photomultipliers is suitable for T(e) > 5 keV.
  • Development of fast near-infrared detectors is required for T(e) of 500 eV.

Conclusions:

  • The proposed LIDAR Thomson scattering system design is validated for core profile measurements in ITER.
  • The chosen laser and detector combination is effective for high-temperature plasma diagnostics.
  • Further detector development is necessary to meet the full operational temperature range.