Robust estimate of dynamo thresholds in the von K\'arm\'an sodium experiment using the Extreme Value Theory

التفاصيل البيبلوغرافية
العنوان: Robust estimate of dynamo thresholds in the von K\'arm\'an sodium experiment using the Extreme Value Theory
المؤلفون: Faranda, Davide, Bourgoin, Mickael, Miralles, Sophie, Odier, Philippe, Pinton, Jean-Francois, Plihon, Nicolas, Daviaud, François, Dubrulle, Bérengère
سنة النشر: 2014
المجموعة: Physics (Other)
مصطلحات موضوعية: Physics - Fluid Dynamics, Physics - Data Analysis, Statistics and Probability
الوصف: We apply a new threshold detection method based on the extreme value theory to the von K\'arm\'an sodium (VKS) experiment data. The VKS experiment is a successful attempt to get a dynamo magnetic field in a laboratory liquid-metal experiment. We first show that the dynamo threshold is associated to a change of the probability density function of the extreme values of the magnetic field. This method does not require the measurement of response functions from applied external perturbations, and thus provides a simple threshold estimate. We apply our method to different configurations in the VKS experiment showing that it yields a robust indication of the dynamo threshold as well as evidence of hysteretic behaviors. Moreover, for the experimental configurations in which a dynamo transition is not observed, the method provides a way to extrapolate an interval of possible threshold values.
Comment: 10 pages, 7 figures
نوع الوثيقة: Working Paper
DOI: 10.1088/1367-2630/16/8/083001
URL الوصول: http://arxiv.org/abs/1402.4275
رقم الانضمام: edsarx.1402.4275
قاعدة البيانات: arXiv
الوصف
DOI:10.1088/1367-2630/16/8/083001