TY - JOUR
T1 - Modelling of combined ICRF and NBI heating in JET hybrid plasmas
AU - Gallart, Dani
AU - Mantsinen, Mervi
AU - Challis, Clive
AU - Frigione, Domenico
AU - Graves, Jonathan
AU - Hobirk, Joerg
AU - Belonohy, Eva
AU - Czarnecka, Agata
AU - Eriksson, Jacob
AU - Goniche, Marc
AU - Hellesen, Carl
AU - Jacquet, Philippe
AU - Joffrin, Emmanuel
AU - Krawczyk, Natalia
AU - King, Damian
AU - Lennholm, Morten
AU - Lerche, Ernesto
AU - Pawelec, Ewa
AU - Sips, George
AU - Solano, Emilia
AU - Tsalas, Maximos
AU - Valisa, Marco
N1 - Publisher Copyright:
© 2017 The authors, published by EDP Sciences.
PY - 2017/10/23
Y1 - 2017/10/23
N2 - 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 RNT increases 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.
AB - 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 RNT increases 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.
UR - http://www.scopus.com/inward/record.url?scp=85032628568&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201715703015
DO - 10.1051/epjconf/201715703015
M3 - Conference article
AN - SCOPUS:85032628568
SN - 2101-6275
VL - 157
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 03015
T2 - 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017
Y2 - 30 May 2017 through 2 June 2017
ER -