Density fluctuation profiles on Tore Supra
The ALTAIR experiment on Tore Supra for the analysis of plasma turbulence by CO(2) laser scattering includes features such as 2 pi rotation of analysed k wave vectors, heterodyne detection and accessibility of two simultaneous and independent wave numbers. Taking into account the pitch angle of the magnetic field lines, together with the hypothesis that the fluctuations are mainly perpendicular to these field lines, the spatial resolution along the chord of measurement can be improved. During stationary plasmas in ohmic regimes, fluctuation measurements have been recorded with a rotation of the analysed k vector. Successive angles of k then correspond to different positions of the analysed volume. These measurements have been analysed by using a suitable deconvolution program, which provides the density fluctuation radial profile. It is proved that the scattering signal is compatible with the actual pitch angle profile. It is also verified that the density fluctuation increases towards the edge, but with a flatter profile than in TFR.
Bibliographic Reference: Paper presented: 18th European Conference of the EPS-Plasma Physics Division, Berlin (DE), June 3-7, 1991
Availability: Text not available
Record Number: 199110367 / Last updated on: 1994-12-02
Original language: en
Available languages: en