ALTAIR: An infrared laser scattering diagnostic on the TORE SUPRA tokamak

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143603· OSTI ID:7285372

Truc, A; Quemeneur, A; Hennequin, P; Gresillon, D; Gervais, F ^[1]; Laviron, C; Olivain, J; Saha, S K; Devynck, P ^[2]

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1. Laboratoire de Physique des Milieux Ionises, Ecole Polytechnique, 91128 Palaiseau Cedex (France)
2. Association Euratom-CEA, Departement de Recherches sur la Fusion Controlee, Centre d'Etudes Nucleaires de Cadarache, 13108 Saint-Paul-lez-Durance Cedex (France)

A collective laser light scattering diagnostic ALTAIR (a french acronym for local analysis of anomalous transport using infrared light), using a CO{sub 2} laser beam ({lambda}=10.6 {mu}m) has been realized to measure plasma density fluctuations in the TORE SUPRA tokamak. This article describes in detail the optical setup, the signal processing, acquisition, and control systems required for this experiment. As the density fluctuations propagating in tokamaks have small wave numbers and require small scattering angles, such scattering experiments are considered as having no resolution along the beam. However, taking advantage of the pitch angle variation of the magnetic field lines around the magnetic axis along a vertical chord, it has been possible to obtain partial spatial localization of the scattering volume by rotating the direction of the analyzed wave vector in a horizontal plane. Heterodyne detection is used to determine the fluctuations propagation direction. The experiment has been tested on acoustic waves and the first results obtained on TORE SUPRA indeed show the existence of a spatial resolution.

• OSTI ID: 7285372
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:7; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
INFRARED RADIATION
LIGHT SCATTERING
PLASMA DENSITY
PLASMA DIAGNOSTICS
RADIATIONS
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TORE SUPRA TOKAMAK