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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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New frequency translation technique for FM-CW reflectometry.

Luis Meneses1, Luis Cupido, M E Manso

  • 1Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, 1049-001 Lisboa, Portugal. meneses@ipfn.ist.utl.pt

The Review of Scientific Instruments
|November 10, 2010
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Summary

A new double frequency conversion technique enhances broadband microwave reflectometry systems. This method improves phase information and sensitivity for plasma diagnostics, outperforming single conversion techniques.

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Area of Science:

  • Plasma physics
  • Microwave engineering
  • Diagnostic techniques

Background:

  • Broadband microwave reflectometry utilizes coherent detection for phase information and sensitivity in plasma diagnostics.
  • Coherent detection requires a frequency-translated probing signal for a stable intermediate frequency.

Purpose of the Study:

  • To present a novel double frequency conversion technique for generating frequency translation in microwave reflectometry.
  • To discuss the advantages of this new technique over traditional single frequency conversion methods.

Main Methods:

  • Development of a novel frequency translation technique using double frequency conversion.
  • Comparison with single frequency conversion techniques employing image rejection mixers.
  • Implementation and testing of new frequency translator modules for JET FM-CW reflectometers.

Main Results:

  • The novel double frequency conversion technique was successfully implemented in three JET FM-CW reflectometers.
  • These modules have been operating successfully at JET since mid-2009.
  • The new technique offers advantages over commonly used single frequency conversion methods.

Conclusions:

  • The presented double frequency conversion technique provides an effective method for frequency translation in broadband microwave reflectometry.
  • This advancement enhances system sensitivity and phase information acquisition for plasma diagnostics.
  • The successful deployment at JET demonstrates the practical viability and benefits of the new technology.