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Title: Reflectometry: A Reliable And Sensitive Plasma Diagnostic For Density Profile And Turbulence Measurements On Tore-Supra

Abstract

A set of four reflectometers has been installed on Tore-Supra to measure the density profiles and the properties of density fluctuations with good spatial resolution. Fast swept X-mode reflectometers covering the range 50 to 155 GHz provide reliable and accurate measurements of the whole density profile from the edge on the outer side up to the core on the high field side even during large and fast profile evolution. Precise evaluation of the density profile is crucial for particle transport studies. A particular feature, a local peaking, has been observed in the core during ohmic discharge. Density fluctuations are measured with three different techniques. The classical fixed frequency method looks at large scale fluctuations (kr < 3 cm-1) . It measures the radial profile of fluctuations and can detect density perturbation associated to high frequency modes. A new method has been validated to measure the radial profile of small scale density fluctuations from fast FM-CW phase reflected signal. This method could also retrieve the radial wavenumber spectrum. The last method Doppler reflectometry is based on back scattering. It measures the poloidal rotation and fluctuations amplitude at different poloidal wave numbers (3 < k{theta} < 20 cm-1). This collection of diagnosticsmore » achieves complementary measurements from the low to the high field side of the discharge and from large to small scale.« less

Authors:
; ; ; ; ;  [1]; ; ;  [2];  [3];  [4]
  1. Association Euratom-CEA, CEA/DSM/DRFC, Centre de Cadarache, 13108 Saint Paul lez Durance (France)
  2. LPTP, CNRS (UMR-7648), Ecole Poly technique, 91128 Palaiseau (France)
  3. LPMIA, Universite Henri Poincare, BP 239, 54506 VANDOEUVRE Cedex (France)
  4. LPIIM, CNRS (UMR 6633) -- Universite de Provence, 13397 Marseille Cedex 20 (France)
Publication Date:
OSTI Identifier:
20797879
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 812; Journal Issue: 1; Conference: PLASMA 2005: International conference on research and applications of plasmas; 3. German-Polish conference on plasma diagnostics for fusion and applications; 5. French-Polish seminar on thermal plasma in space and laboratory, Opole-Turawa (Poland), 6-9 Sep 2005; Other Information: DOI: 10.1063/1.2168805; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; BACKSCATTERING; DISTURBANCES; FLUCTUATIONS; GHZ RANGE; MICROWAVE RADIATION; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA RADIAL PROFILES; RADIATION TRANSPORT; ROTATION; SPATIAL RESOLUTION; TORE SUPRA TOKAMAK; TURBULENCE

Citation Formats

Sabot, R., Clairet, F., Giacalone, J. C., Molina, D., Sirinelli, A., Vermare, L., Hennequin, P., Honore, C., Truc, A., Heuraux, S., and Leclert, G. Reflectometry: A Reliable And Sensitive Plasma Diagnostic For Density Profile And Turbulence Measurements On Tore-Supra. United States: N. p., 2006. Web. doi:10.1063/1.2168805.
Sabot, R., Clairet, F., Giacalone, J. C., Molina, D., Sirinelli, A., Vermare, L., Hennequin, P., Honore, C., Truc, A., Heuraux, S., & Leclert, G. Reflectometry: A Reliable And Sensitive Plasma Diagnostic For Density Profile And Turbulence Measurements On Tore-Supra. United States. doi:10.1063/1.2168805.
Sabot, R., Clairet, F., Giacalone, J. C., Molina, D., Sirinelli, A., Vermare, L., Hennequin, P., Honore, C., Truc, A., Heuraux, S., and Leclert, G. Sun . "Reflectometry: A Reliable And Sensitive Plasma Diagnostic For Density Profile And Turbulence Measurements On Tore-Supra". United States. doi:10.1063/1.2168805.
@article{osti_20797879,
title = {Reflectometry: A Reliable And Sensitive Plasma Diagnostic For Density Profile And Turbulence Measurements On Tore-Supra},
author = {Sabot, R. and Clairet, F. and Giacalone, J. C. and Molina, D. and Sirinelli, A. and Vermare, L. and Hennequin, P. and Honore, C. and Truc, A. and Heuraux, S. and Leclert, G.},
abstractNote = {A set of four reflectometers has been installed on Tore-Supra to measure the density profiles and the properties of density fluctuations with good spatial resolution. Fast swept X-mode reflectometers covering the range 50 to 155 GHz provide reliable and accurate measurements of the whole density profile from the edge on the outer side up to the core on the high field side even during large and fast profile evolution. Precise evaluation of the density profile is crucial for particle transport studies. A particular feature, a local peaking, has been observed in the core during ohmic discharge. Density fluctuations are measured with three different techniques. The classical fixed frequency method looks at large scale fluctuations (kr < 3 cm-1) . It measures the radial profile of fluctuations and can detect density perturbation associated to high frequency modes. A new method has been validated to measure the radial profile of small scale density fluctuations from fast FM-CW phase reflected signal. This method could also retrieve the radial wavenumber spectrum. The last method Doppler reflectometry is based on back scattering. It measures the poloidal rotation and fluctuations amplitude at different poloidal wave numbers (3 < k{theta} < 20 cm-1). This collection of diagnostics achieves complementary measurements from the low to the high field side of the discharge and from large to small scale.},
doi = {10.1063/1.2168805},
journal = {AIP Conference Proceedings},
number = 1,
volume = 812,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}