Abstract
The ALTAIR diagnostic has been developed to analyse the density fluctuations with wavelength between 0.2 and 2 cm in the tokamak TORE SUPRA. These fluctuations are measured by coherent Thomson scattering of a CO{sub 2} laser beam. The localisation of the fluctuations is an important aspect in a scattering experiment in a tokamak. For small scattering angles ({approx} 1 mrad) the transverse resolution is excellent; the diameter of the beam (5cm) is very small compared to the diameter of the plasma (160cm). Conversely, there is no resolution along the observation direction because the length of the scattering volume is larger than the diameter of the plasma. If we take into account the helicity of the magnetic field lines in the tokamak, adding the fact that the turbulence wave vector is mainly perpendicular to these field lines, some resolution can be obtained along the direction of the beam.
Laviron, C;
Devynck, P;
Garbet, X;
Payan, J;
Saha, S K;
[1]
Truc, A;
Quemeneur, A;
Hennequin, P;
Gresillon, D;
Gervais, F
[2]
- Association Euratom-CEA, Centre d`Etudes Nucleaires de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
- Ecole Polytechnique, 91 - Palaiseau (France). Lab. de Physique des Milieux Ionises
Citation Formats
Laviron, C, Devynck, P, Garbet, X, Payan, J, Saha, S K, Truc, A, Quemeneur, A, Hennequin, P, Gresillon, D, and Gervais, F.
Spatial resolution with a CO{sub 2} laser scattering experiment on TORE SUPRA.
France: N. p.,
1991.
Web.
Laviron, C, Devynck, P, Garbet, X, Payan, J, Saha, S K, Truc, A, Quemeneur, A, Hennequin, P, Gresillon, D, & Gervais, F.
Spatial resolution with a CO{sub 2} laser scattering experiment on TORE SUPRA.
France.
Laviron, C, Devynck, P, Garbet, X, Payan, J, Saha, S K, Truc, A, Quemeneur, A, Hennequin, P, Gresillon, D, and Gervais, F.
1991.
"Spatial resolution with a CO{sub 2} laser scattering experiment on TORE SUPRA."
France.
@misc{etde_10116320,
title = {Spatial resolution with a CO{sub 2} laser scattering experiment on TORE SUPRA}
author = {Laviron, C, Devynck, P, Garbet, X, Payan, J, Saha, S K, Truc, A, Quemeneur, A, Hennequin, P, Gresillon, D, and Gervais, F}
abstractNote = {The ALTAIR diagnostic has been developed to analyse the density fluctuations with wavelength between 0.2 and 2 cm in the tokamak TORE SUPRA. These fluctuations are measured by coherent Thomson scattering of a CO{sub 2} laser beam. The localisation of the fluctuations is an important aspect in a scattering experiment in a tokamak. For small scattering angles ({approx} 1 mrad) the transverse resolution is excellent; the diameter of the beam (5cm) is very small compared to the diameter of the plasma (160cm). Conversely, there is no resolution along the observation direction because the length of the scattering volume is larger than the diameter of the plasma. If we take into account the helicity of the magnetic field lines in the tokamak, adding the fact that the turbulence wave vector is mainly perpendicular to these field lines, some resolution can be obtained along the direction of the beam.}
place = {France}
year = {1991}
month = {Dec}
}
title = {Spatial resolution with a CO{sub 2} laser scattering experiment on TORE SUPRA}
author = {Laviron, C, Devynck, P, Garbet, X, Payan, J, Saha, S K, Truc, A, Quemeneur, A, Hennequin, P, Gresillon, D, and Gervais, F}
abstractNote = {The ALTAIR diagnostic has been developed to analyse the density fluctuations with wavelength between 0.2 and 2 cm in the tokamak TORE SUPRA. These fluctuations are measured by coherent Thomson scattering of a CO{sub 2} laser beam. The localisation of the fluctuations is an important aspect in a scattering experiment in a tokamak. For small scattering angles ({approx} 1 mrad) the transverse resolution is excellent; the diameter of the beam (5cm) is very small compared to the diameter of the plasma (160cm). Conversely, there is no resolution along the observation direction because the length of the scattering volume is larger than the diameter of the plasma. If we take into account the helicity of the magnetic field lines in the tokamak, adding the fact that the turbulence wave vector is mainly perpendicular to these field lines, some resolution can be obtained along the direction of the beam.}
place = {France}
year = {1991}
month = {Dec}
}