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New Thomson scattering diagnostic on RFX-mod.

A Alfier1, R Pasqualotto

  • 1Dipartamento di Fisica G. Galilei, Università degli Studi di Padova, Via Marzolo 8, I-35100 Padova, Italy. alberto.alfier@igi.cnr.it

The Review of Scientific Instruments
|May 17, 2007
PubMed
Summary

The upgraded Thomson scattering diagnostic in the RFX-mod fusion device provides high-resolution electron temperature and density profiles. This enhanced system delivers reliable plasma measurements for fusion energy research.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Diagnostic Techniques

Background:

  • The Reversed Field eXperiment (RFX-mod) underwent significant renovations, necessitating an upgraded diagnostic system.
  • Accurate measurement of plasma parameters is crucial for understanding and controlling fusion processes.

Purpose of the Study:

  • To describe the completely renovated Thomson scattering (TS) diagnostic system.
  • To detail its performance in measuring electron temperature and density profiles in the RFX-mod.

Main Methods:

  • Utilized a custom Nd:YLF laser producing 10 pulses at 50 Hz (3 J energy) for high-repetition rate measurements.
  • Employed 28 interference filter spectrometers with an optical delay system for 84 spatial resolution points (7 mm).
  • Used avalanche photodiodes and waveform digitizers for signal detection and recording, with a supercontinuum light source for relative temperature calibration and rotational Raman scattering in nitrogen for absolute density calibration.

Main Results:

  • The TS diagnostic successfully provided ten profile measurements within a 300 ms plasma discharge duration.
  • Demonstrated reliable, high-resolution electron temperature and density profiles during 2005 experimental campaigns.
  • Achieved precise measurements with 7 mm spatial resolution along an equatorial diameter.

Conclusions:

  • The renovated TS diagnostic is a high-performance system capable of delivering reliable, high-resolution plasma profiles.
  • This advancement supports ongoing research and operational control of the RFX-mod fusion device.
  • The calibration methods ensure accuracy for both electron temperature and density measurements.