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Abstract

Reflectometry is widely used to measure the electronic density profile in tokamak plasmas. Its principle is based upon a radar procedure and it determines the phase shift of a millimetre wave propagating into the plasma and reflected at a cut off layer. Sweeping the source frequency is the standard technique to reconstruct the density profile.

On Tore Supra, O mode reflectometry diagnostics using backward wave oscillators have operated routinely for more than 10 years. However, plasma turbulence and magnetohydrodynamic (MHD) degraded density measurements. To increase diagnostic reliability, a new 26-36 GHz O-mode heterodyne reflectometer was developed. Its high dynamic heterodyne detection and ultra fast sweep capabilities (up to 10 µs) provided by its solid state source greatly improved phase determination and reduced MHD and turbulence effects..

Additional information

Authors: LECLERT G, LPIIM, CNRS 6633, Universite de Provence, Marseille (FR);HACQUIN S, LPIIM, CNRS 7040, Universite Henri Poincare Nancy, Vandoeuvre (FR);COLIN M, LPIIM, CNRS 7040, Universite Henri Poincare Nancy, Vandoeuvre (FR);HEURAUX S, LPIIM, CNRS 7040, Universite Henri Poincare Nancy, Vandoeuvre (FR);CLAIRET F ET AL, DRFC, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Review of Scientific Instruments, Vol.72, No.1 (2001), pp.340-343
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