Plasma blob generation due to cooperative elliptic instability |
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Authors: | Manz P Xu M Müller S H Fedorczak N Thakur S C Yu J H Tynan G R |
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Institution: | Center for Momentum Transport and Flow Organization, University of California at San Diego, San Diego, California 92093, USA. |
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Abstract: | Using fast-camera measurements the generation mechanism of plasma blobs is investigated in the linear device CSDX. During the ejection of plasma blobs the plasma is dominated by an m=1 mode, which is a counterrotating vortex pair. These flows are known to be subject to the cooperative elliptic instability, which is characterized by a cooperative disturbance of the vortex cores and results in a three-dimensional breakdown of two-dimensional flows. The first experimental evidence of a cooperative elliptic instability preceding the blob-ejection is provided in terms of the qualitative evolution of the vortex geometries and internal wave patterns. |
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