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FP7

Observation of E × B Flow Velocity Profile Change Using Doppler Reflectometry in HL-2A

Funded under: FP7-EURATOM

Abstract

A broadband, O-mode sweeping Doppler reflectometry designed for measuring plasma E × B flow velocity profiles is operated in HL-2A. The main feature of the Doppler reflectometry is its capability to be tuned to any selected frequency in total waveband from 26-40 GHz. This property enables us to probe several plasma layers within a short time interval during a discharge, permitting the characterization of the radial distribution of plasma fluctuations. The system allows us to extract important information about the velocity change layer, namely its spatial localization. In purely Ohmic discharge a change of the E × B flow velocity profiles has been observed in the region for 28 < r < 30 cm if only the line average density exceeds 2.2 × 10{19} m{-3). The density gradient change is measured in the same region, too.

Additional information

Authors: WEI-WEN X et al, Southwestern Institute of Physics, Chengdu (CN);XIAO-LAN Z, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SHAO-DONG S, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Chinese Physics Letters, Volume 26 (2009), 4pp.
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0256-307X/26/3/035201
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