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Fusion Science and Technology
Latest News
NRC nominee Nieh commits to independent safety mission
During a Senate Environment and Public Works Committee hearing today, Ho Nieh, President Donald Trump’s nominee to serve as a commissioner at the Nuclear Regulatory Commission, was urged to maintain the agency’s independence regardless of political pressure from the Trump administration.
J. A. Alonso, S. J. Zweben, J. L. de Pablos, E. de la Cal, C. Hidalgo, T. Klinger, B. Ph. Van Milligen, M. A. Pedrosa, C. Silva, H. Thomsen
Fusion Science and Technology | Volume 50 | Number 2 | August 2006 | Pages 301-306
Technical Paper | Stellarators | doi.org/10.13182/FST06-A1250
Articles are hosted by Taylor and Francis Online.
Two-dimensional edge plasma turbulence as measured by high-speed H imaging is investigated in the TJ-II stellarator. An image analysis method based on two-dimensional continuous wavelet transformation is introduced. This method detects localized coherent structures (blobs) in the images and extracts their geometrical characteristics (position, scale, orientation angle, and aspect ratio). This paper studies the impact of edge shear layers (both spontaneous and biased induced) on these geometrical aspects of blobs. Results show a reduction in the angular dispersion of k ~ 1.2 to 1.4 cm-1 blobs as the shear layer (both spontaneous and biased induced) is established in the boundary, as well as a shift of the aspect ratio histogram toward higher values. The turbulence suppression induced by the biasing seems to be scale selective, more effectively suppressing k ~ 1.4 cm-1, ~ 4.5 cm structures than k ~ 0.7 cm-1, ~ 9.0 cm ones.