Modelling of combined ICRF and NBI heating in JET hybrid plasmas

Dani Gallart, Mervi Mantsinen, Clive Challis, Domenico Frigione, Jonathan Graves, Joerg Hobirk, Eva Belonohy, Agata Czarnecka, Jacob Eriksson, Marc Goniche, Carl Hellesen, Philippe Jacquet, Emmanuel Joffrin, Natalia Krawczyk, Damian King, Morten Lennholm, Ernesto Lerche, Ewa Pawelec, George Sips, Emilia SolanoMaximos Tsalas, Marco Valisa

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

During the 2015-2016 JET campaigns many efforts have been devoted to the exploration of high performance plasma scenarios envisaged for ITER operation. In this paper we model the combined ICRF+NBI heating in selected key hybrid discharges using PION. The antenna frequency was tuned to match the cyclotron frequency of minority hydrogen (H) at the center of the tokamak coinciding with the second harmonic cyclotron resonance of deuterium. The modelling takes into account the synergy between ICRF and NBI heating through the second harmonic cyclotron resonance of deuterium beam ions which allows us to assess its impact on the neutron rate RNT. We evaluate the influence of H concentration which was varied in different discharges in order to test their role in the heating performance. According to our modelling, the ICRF enhancement of RNTincreases by decreasing the H concentration which increases the ICRF power absorbed by deuterons. We find that in the recent hybrid discharges this ICRF enhancement was in the range of 10-25%. Finally, we extrapolate the results to D-T and find that the best performing hybrid discharges correspond to an equivalent fusion power of ∼7.0 MW in D-T.
Original languageEnglish
DOIs
Publication statusPublished - 23 Oct 2017
Externally publishedYes
Event22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 - Aix en Provence, France
Duration: 23 Oct 2017 → …

Conference

Conference22nd Topical Conference on Radio-Frequency Power in Plasmas 2017
CountryFrance
CityAix en Provence
Period23/10/17 → …

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Gallart, D., Mantsinen, M., Challis, C., Frigione, D., Graves, J., Hobirk, J., Belonohy, E., Czarnecka, A., Eriksson, J., Goniche, M., Hellesen, C., Jacquet, P., Joffrin, E., Krawczyk, N., King, D., Lennholm, M., Lerche, E., Pawelec, E., Sips, G., ... Valisa, M. (2017). Modelling of combined ICRF and NBI heating in JET hybrid plasmas. Paper presented at 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017, Aix en Provence, France. https://doi.org/10.1051/epjconf/201715703015