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Start Over Author "Mantsinen, Mervi" Topic cyclotron resonance
3 results on '"Mantsinen, Mervi"'

1. Modelling of combined ICRF and NBI heating in JET hybrid plasmas

Author

Gallart, Dani, Mantsinen, Mervi, Challis, Clive, Frigione, Domenico, Graves, Jonathan, Hobirk, Joerg, Belonohy, Eva, Czarnecka, Agata, Eriksson, Jacob, Goniche, Marc, Hellesen, Carl, Jacquet, Philippe, Joffrin, Emmanuel, Krawczyk, Natalia, King, Damian, Lennholm, Morten, Lerche, Ernesto, Pawelec, Ewa, Sips, George, Solano, Emilia, Tsalas, Maximos, Valisa, Marco, Barcelona Supercomputing Center, JET Contributors, and Frigione, D.

Subjects
Tokamak, QC1-999, Cyclotron, Cyclotron resonance, 01 natural sciences, 7. Clean energy, Fusió nuclear controlada, 010305 fluids & plasmas, law.invention, law, NBI heating, 0103 physical sciences, Neutron, 010306 general physics, Fusion reactions, ICRF and NBI heating, Jet (fluid), ICRF, Física [Àrees temàtiques de la UPC], Chemistry, Physics, Plasma, Fusion power, Computational physics, JET hybrid plasmas, Harmonic, Atomic physics
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 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. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Dani Gallart would like to thank “La Caixa” for support of his PhD studies.

Published
2017
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2. The Role of Combined ICRF and NBI Heating in JET Hybrid Plasmas in Quest for High D-T Fusion Yield.

Author

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

Subjects
*CYCLOTRON resonance, *PLASMA beam injection heating, *NEUTRAL beams, *ELECTRONS, *PLASMA gases
Abstract

Combined ICRF and NBI heating played a key role in achieving the world-record fusion yield in the first deuterium-tritium campaign at the JET tokamak in 1997. The current plans for JET include new experiments with deuterium-tritium (D-T) plasmas with more ITER-like conditions given the recently installed ITER-like wall (ILW). In the 2015-2016 campaigns, significant efforts have been devoted to the development of high-performance plasma scenarios compatible with ILW in preparation of the forthcoming D-T campaign. Good progress was made in both the inductive (baseline) and the hybrid scenario: a new record JET ILW fusion yield with a significantly extended duration of the high-performance phase was achieved. This paper reports on the progress with the hybrid scenario which is a candidate for ITER longpulse operation (~1000 s) thanks to its improved normalized confinement, reduced plasma current and higher plasma beta with respect to the ITER reference baseline scenario. The combined NBI+ICRF power in the hybrid scenario was increased to 33 MW and the record fusion yield, averaged over 100 ms, to 2.9x1016 neutrons/s from the 2014 ILW fusion record of 2.3x1016 neutrons/s. Impurity control with ICRF waves was one of the key means for extending the duration of the high-performance phase. The main results are reviewed covering both key core and edge plasma issues. [ABSTRACT FROM AUTHOR]

Published
2017
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3. Modelling of ICRF Heating in DEMO with Special Emphasis on Bulk Ion Heating.

Author

Gallart, Dani, Mantsinen, Mervi, and Kazakov, Yevgen

Subjects
*PLASMA heating, *CYCLOTRON resonance, *PLASMA temperature, *THEORY of wave motion
Abstract

Ion cyclotron resonance frequency (ICRF) heating is one of the auxiliary heating schemes presently envisaged for ITER and DEMO. In this paper we analyse the potential of ICRF waves to heat the fuel ions in DEMO. Our analysis is carried out for the DEMO1 Reference Scenario from October 2013 (B = 6.8 T, I = 18.6 MA, R = 9.25 m, a = 2.64 m) optimized for a maximum pulse length of 2.3 hrs using the ICRF modelling codes PION and TORIC. We focus on second harmonic heating of tritium and fundamental minority heating of -3He ions (with a few percent of 3He) in a 50%:50% D-T plasma. The dependence of the ICRF characteristics and the ICRF-accelerated ions on the ICRF and plasma parameters is investigated, giving special attention to the DEMO design point at a core plasma temperature of 30 keV and an electron density of 1.2·1020 m-3. [ABSTRACT FROM AUTHOR]

Published
2015
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