Global scaling of the heat transport in fusion plasmas

Sara Moradi, Johan Anderson, Michele Romanelli, Hyun Tae Kim, X. Litaudon, S. Abduallev, M. Abhangi, P. Abreu, M. Afzal, K. M. Aggarwal, T. Ahlgren, J. H. Ahn, Leena Aho-Mantila, N. Aiba, Markus Airila, R. Albanese, V. Aldred, D. Alegre, E. Alessi, P. AleynikovA. Alfier, A. Alkseev, M. Allinson, B. Alper, E. Alves, G. Ambrosino, R. Ambrosino, L. Amicucci, V. Amosov, E. Andersson Sundén, M. Angelone, M. Anghel, C. Angioni, L. Appel, C. Appelbee, P. Arena, M. Ariola, H. Arnichand, S. Arshad, A. Ash, N. Ashikawa, V. Aslanyan, O. Asunta, Antti Hakola, Seppo Koivuranta, Jari Likonen, Y. Liu, Antti Salmi, Paula Sirén, Tuomas Tala, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    A global heat flux model based on a fractional derivative of plasma pressure is proposed for the heat transport in fusion plasmas. The degree of the fractional derivative of the heat flux, α, is defined through the power balance analysis of the steady state. The model was used to obtain the experimental values of α for a large database of the Joint European Torus (JET) carbon-wall as well as ITER like-wall plasmas. The fractional degrees of the electron heat flux are found to be α<2, for all the selected pulses in the database, suggesting a deviation from the diffusive paradigm. Moreover, the results show that as the volume integrated input power is increased, the fractional degree of the electron heat flux converges to α∼0.8, indicating a global scaling between the net heating and the pressure profile in the high-power JET plasmas. The model is expected to provide insight into the proper kinetic description for the fusion plasmas and improve the accuracy of the heat transport predictions.

    Original languageEnglish
    Article number013027
    JournalPhysical review research
    Volume2
    Issue number1
    DOIs
    Publication statusPublished - 8 Jan 2020
    MoE publication typeA1 Journal article-refereed

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