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Analysis techniques for blob properties from gas puff imaging data.
Rev Sci Instrum
March 2023
EPFL, Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
Filamentary structures, also known as blobs, are a prominent feature of turbulence and transport at the edge of magnetically confined plasmas. They cause cross-field particle and energy transport and are, therefore, of interest in tokamak physics and, more generally, nuclear fusion research. Several experimental techniques have been developed to study their properties.
View Article and Find Full Text PDFTracking blobs in the turbulent edge plasma of a tokamak fusion device.
Sci Rep
October 2022
MIT Computer Science & Artificial Intelligence Laboratory (CSAIL), Cambridge, MA, 02139, USA.
The analysis of turbulence in plasmas is fundamental in fusion research. Despite extensive progress in theoretical modeling in the past 15 years, we still lack a complete and consistent understanding of turbulence in magnetic confinement devices, such as tokamaks. Experimental studies are challenging due to the diverse processes that drive the high-speed dynamics of turbulent phenomena.
View Article and Find Full Text PDFIon temperature measurement techniques using fast sweeping retarding field analyzer (RFA) in strongly intermittent ASDEX Upgrade tokamak plasmas.
Rev Sci Instrum
June 2020
Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, GermanyInstitute of Plasma Physics, National Science Center Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
This manuscript presents a new method of interpreting the ion temperature (T) measurement with a retarding field analyzer (RFA) that accounts for the intermittent/turbulent nature of the scrape off layer (SOL) plasmas in tokamaks. Fast measurements and statistical methods are desirable for an adequate description of random fluctuations caused by such intermittent events as edge localized modes (ELMs) and blobs. We use a RFA that can sweep its current-voltage (I-V) characteristics with up to 10 kHz.
View Article and Find Full Text PDFNoninvasive measurement of dissipation in colloidal systems.
Phys Rev E Stat Nonlin Soft Matter Phys
September 2012
II. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
According to Harada and Sasa [Phys. Rev. Lett.
View Article and Find Full Text PDFSurvival of related individuals: an extension of some fundamental results of heterogeneity analysis.
Math Popul Stud
September 1996
"Many ideas in the analysis of heterogeneous mortality are based on the relationship between individual and observed hazard rates. This connection is established with the help of conditional averaging procedure: The observed risk of death at age x is calculated among those who survive this age. The analogy of this result for bivariate survival model with correlated individual hazards is derived.
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