Experimental observation of the blob-generation mechanism from interchange waves in a plasma |
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| Authors: | Furno I Labit B Podestà M Fasoli A Müller S H Poli F M Ricci P Theiler C Brunner S Diallo A Graves J |
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| Institution: | Centre de Recherches en Physique des Plasmas-Ecole Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse, CH-1015 Lausanne, Switzerland. |
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| Abstract: | The mechanism for blob generation in a toroidal magnetized plasma is investigated using time-resolved measurements of two-dimensional structures of electron density, temperature, and plasma potential. The blobs are observed to form from a radially elongated structure that is sheared off by the E x B flow. The structure is generated by an interchange wave that increases in amplitude and extends radially in response to a decrease of the radial pressure scale length. The dependence of the blob amplitude upon the pressure radial scale length is discussed. |
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