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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Doppler reflectometer system in the stellarator TJ-II.

T Happel1, T Estrada, E Blanco

  • 1Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT, 28040 Madrid, Spain. tim.happel@ciemat.es

The Review of Scientific Instruments
|August 7, 2009
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Summary

A new Doppler reflectometer system was installed in the stellarator TJ-II, enabling precise measurements of plasma density fluctuations. This system measures perpendicular wave numbers and velocities, crucial for understanding plasma behavior in fusion devices.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Microwave diagnostics

Background:

  • Stellarator TJ-II requires advanced diagnostics for high-curvature plasma studies.
  • Doppler reflectometry is a key technique for measuring plasma properties.

Purpose of the Study:

  • To install and optimize a Q-band Doppler reflectometer system in the TJ-II stellarator.
  • To measure perpendicular wave numbers and velocities of plasma density fluctuations.

Main Methods:

  • Utilized a steerable mirror for +/-20 degree launch angles, enabling k(perpendicular) measurements from 3-15 cm(-1).
  • Employed the 3D ray/beam-tracing code TRUBA for localization and k(perpendicular) estimation.
  • Collected initial spectra and radial profiles of plasma density fluctuations.

Main Results:

  • Successfully installed and calibrated the Doppler reflectometer system.
  • Obtained first measurements of plasma density fluctuation spectra.
  • Generated radial profiles of perpendicular velocity for plasma density fluctuations.

Conclusions:

  • The new Doppler reflectometer system is effective for studying high-curvature plasmas in TJ-II.
  • The system's capabilities allow for detailed analysis of plasma turbulence and transport.
  • Future research will focus on detailed analysis of the measured plasma properties.