Additional Evidence for the Universality of the Probability Distribution of Turbulent Fluctuations and Fluxes in the Scrape-off Layer Region of Fusion Plasmas - art. no. 052507

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1884615· OSTI ID:989629

van Milligen, B Ph ^[1]; Sanchez, Raul ^[2]; Carreras, Benjamin A ^[3]; Lynch, Vickie E ^[3]; LaBombard, Brian ^[4]; Pedrosa, M A ^[5]; Hidalgo, Carlos ^[5]; Goncalves, B ^[6]; Balb�n, Rosa ^[5]

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1. Asociacion EURATOM-CIEMAT
2. Universidad Carlos III, Madrid, Spain
3. ORNL
4. Massachusetts Institute of Technology (MIT)
5. EURATOM-CIEMAT, Madrid, Spain
6. EURATOM IST Assoc., Lisbon, Portugal

Plasma density fluctuations and electrostatic turbulent fluxes measured at the scrape-off layer of the Alcator C-Mod tokamak [ B. LaBombard, R. L. Boivin, M. Greenwald, J. Hughes, B. Lipschultz, D. Mossessian, C. S. Pitcher, J. L. Terry, and S. J. Zweben, Phys. Plasmas 8, 2107 (2001) ], the Wendelstein 7-Advanced Stellarator [ H. Renner, E. Anabitarte, E. Ascasibar et al., Plasma Phys. Controlled Fusion 31, 1579 (1989) ], and the TJ-II stellarator [ C. Alejaldre, J. Alonso, J. Botija et al., Fusion Technol. 17, 131 (1990) ] are shown to obey a non-Gaussian but apparently universal (i.e., not dependent on device and discharge parameters) probability density distribution (pdf). The fact that a specific shape acts as an attractor for the pdf seems to suggest that emergent behavior and self-regulation are relevant concepts for these fluctuations. This shape is closely similar to the so-called Bramwell, Holdsworth, and Pinton distribution, which does not have any free parameters.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 989629
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 12; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATTRACTORS
DISTRIBUTION
ELECTROSTATICS
FLUCTUATIONS
PLASMA
PLASMA DENSITY
PROBABILITY
SHAPE
STELLARATORS