The H mode of confinement in Tokamaks is characterized by a thin region of high gradients, located at the edge of the plasma and called the Edge Transport Barrier. Even if various theoretical models have been proposed for the interpretation of the edge physics, the main empirical scaling laws of the plasma confinement time are expressed in terms of global plasma parameters and they do not discriminate between the edge and core regions. Moreover all the scaling laws are assumed to be power law monomials. In the present paper, a new methodology is proposed to investigate the validity of both assumptions. The approach is based on Symbolic Regression via Genetic Programming and allows first the extraction of the most statistically reliable models from the available experimental data in the ITPA database. Non linear fitting is then applied to the mathematical expressions found by Symbolic regression. The obtained scaling laws are compared with the traditional scalings in power law form. © 2015 The Authors. Published by Elsevier B.V.

Peluso, E., Gelfusa, M., Murari, A., Lupelli, I., Gaudio, P. (2015). A statistical analysis of the scaling laws for the confinement time distinguishing between core and edge. PHYSICS PROCEDIA, 62, 113-117 [10.1016/j.phpro.2015.02.020].

A statistical analysis of the scaling laws for the confinement time distinguishing between core and edge

Peluso, E;GELFUSA, MICHELA;GAUDIO, PASQUALINO
2015-01-01

Abstract

The H mode of confinement in Tokamaks is characterized by a thin region of high gradients, located at the edge of the plasma and called the Edge Transport Barrier. Even if various theoretical models have been proposed for the interpretation of the edge physics, the main empirical scaling laws of the plasma confinement time are expressed in terms of global plasma parameters and they do not discriminate between the edge and core regions. Moreover all the scaling laws are assumed to be power law monomials. In the present paper, a new methodology is proposed to investigate the validity of both assumptions. The approach is based on Symbolic Regression via Genetic Programming and allows first the extraction of the most statistically reliable models from the available experimental data in the ITPA database. Non linear fitting is then applied to the mathematical expressions found by Symbolic regression. The obtained scaling laws are compared with the traditional scalings in power law form. © 2015 The Authors. Published by Elsevier B.V.
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961833576&partnerID=40&md5=d2844e40933e309b0597b2ed187ba3ec
Peluso, E., Gelfusa, M., Murari, A., Lupelli, I., Gaudio, P. (2015). A statistical analysis of the scaling laws for the confinement time distinguishing between core and edge. PHYSICS PROCEDIA, 62, 113-117 [10.1016/j.phpro.2015.02.020].
Peluso, E; Gelfusa, M; Murari, A; Lupelli, I; Gaudio, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/157919
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