In many scientific applications, it is important to investigate how certain properties scale with the parameters of the systems. The experimental studies of scalings have traditionally been addressed with log regression, which limits the results to power laws and to theoretical and not data-driven dimensionless quantities. This has also been the case in nuclear fusion, in which the scaling of the energy confinement time is a crucial aspect in understanding the physics of transport and in the design of future devices. Traditionally two main assumptions are at the basis of the most widely accepted empirical scaling laws for the confinement time: (a) the dimensionless variables used are the ones derived from the symmetries of the Vlasov equation; (b) the final scalings have the mathematical form of power laws. In this paper, it is shown how symbolic regression (SR), implemented with genetic programming (GP) techniques, can be used to test these hypotheses. Neither assumption is confirmed by the available data of the multi-machine International Tokamak Physics Activity (ITPA) of validated tokamak discharges. The statistically soundest expressions are not power laws and cannot be formulated in terms of the traditional dimensionless quantities. The consequences of the data-driven scaling laws obtained are both practical and theoretical: the confinement time for the ITER can be significantly shorter than foreseen by power laws and different dimensionless variables should be considered for theoretical investigations. On the other hand, higher quality databases should be built to reduce the uncertainties in the extrapolations. It is also worth emphasising that the proposed methodology is fully general and therefore can be applied to any field of science.

Murari, A., Peluso, E., Lungaroni, M., Gelfusa, M., & Gaudio, P. (2015). Application of symbolic regression to the derivation of scaling laws for tokamak energy confinement time in terms of dimensionless quantities. NUCLEAR FUSION, 56(2), 026005 [10.1088/0029-5515/56/2/026005].

Application of symbolic regression to the derivation of scaling laws for tokamak energy confinement time in terms of dimensionless quantities

PELUSO, EMMANUELE;LUNGARONI, MICHELE;GELFUSA, MICHELA;GAUDIO, PASQUALINO
2015

Abstract

In many scientific applications, it is important to investigate how certain properties scale with the parameters of the systems. The experimental studies of scalings have traditionally been addressed with log regression, which limits the results to power laws and to theoretical and not data-driven dimensionless quantities. This has also been the case in nuclear fusion, in which the scaling of the energy confinement time is a crucial aspect in understanding the physics of transport and in the design of future devices. Traditionally two main assumptions are at the basis of the most widely accepted empirical scaling laws for the confinement time: (a) the dimensionless variables used are the ones derived from the symmetries of the Vlasov equation; (b) the final scalings have the mathematical form of power laws. In this paper, it is shown how symbolic regression (SR), implemented with genetic programming (GP) techniques, can be used to test these hypotheses. Neither assumption is confirmed by the available data of the multi-machine International Tokamak Physics Activity (ITPA) of validated tokamak discharges. The statistically soundest expressions are not power laws and cannot be formulated in terms of the traditional dimensionless quantities. The consequences of the data-driven scaling laws obtained are both practical and theoretical: the confinement time for the ITER can be significantly shorter than foreseen by power laws and different dimensionless variables should be considered for theoretical investigations. On the other hand, higher quality databases should be built to reduce the uncertainties in the extrapolations. It is also worth emphasising that the proposed methodology is fully general and therefore can be applied to any field of science.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
English
Con Impact Factor ISI
Murari, A., Peluso, E., Lungaroni, M., Gelfusa, M., & Gaudio, P. (2015). Application of symbolic regression to the derivation of scaling laws for tokamak energy confinement time in terms of dimensionless quantities. NUCLEAR FUSION, 56(2), 026005 [10.1088/0029-5515/56/2/026005].
Murari, A; Peluso, E; Lungaroni, M; Gelfusa, M; Gaudio, P
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
NF_application_symbolic.pdf

non disponibili

Licenza: Copyright dell'editore
Dimensione 2.32 MB
Formato Adobe PDF
2.32 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/166747
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 20
social impact