Browsing by Author "JET Contributors"

Now showing items 1-11 of 11

    • Application of the VUV and the soft x-ray systems on JET for the study of intrinsic impurity behavior in neon seeded hybrid discharges 

      Krawczyk, N.; Czarnecka, A.; Ivanova-Stanik, Irena; Zagórski, R.; Challis, C.; Frigione, D.; Giroud, C.; Graves, J.; Mantsinen, Mervi; Silburn, S.; JET Contributors (AIP Publishing, 2018-10-24)
      Article
      Open Access
      This paper reports on impurity behavior in a set of hybrid discharges with Ne seeding—one of the techniques considered to reduce the power load on reactor walls. A series of experiments carried out with light gas injection ...

    • Effect of inclusion of pitch-angle dependence on a simplified model of RF deposition in tokamak plasma 

      Taylor, David; Mantsinen, Mervi J.; Gallart Escolà, Dani; Manyer Fuertes, Jordi; Sirén, P.; JET Contributors (IOP Publishing, 2022-04)
      Article
      Open Access
      Using the PION ICRH modelling code and comparisons against JET tokamak experiments, the effect of including pitch angle dependence within the RF diffusion operator on the fast ion particle distribution functions is quantified. ...

    • Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating 

      Kazakov, Ye.O.; Ongena, J.; Wright, S.J.; Wukith, S.J.; Lerche, E.; Mantisen, Mervi; van Eester, D.; Craciunescu, T.; Kiptily, V.G.; Lin, Y.; Nocente, M.; Nabais, F.; Nave, M.F.F.; Baranov, Y.; Bielecki, J.; Bilato, R.; Bobkov, V.; Crombé, K.; Czarnecka, A.; Faustin, J.; Felton, R.; Fitzgerald, M.; Gallart, Daniel; Giacomelli, L.; Golfinopoulos, T.; Hubbard, A.; Jacquet, Ph.; Johnson, T.; Lennholm, M.; Loarer, T.; Porkolab, M.; Sharapov, S.; Valcarcel, D.; van Schoor, M.; Weisen, H.; JET Contributors; Alcator C-Mod Team (Nature Publishing Group, 2017-06-19)
      Article
      Open Access
      We describe a new technique for the efficient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed ‘three-ion’ scenarios are especially suited for strong wave absorption ...

    • Fusion product losses due to fishbone instabilities in deuterium JET plasmas 

      Kiptily, V.G.; Fitzgerald, M.; Goloborodko, V.; Sharapov, S.E.; Challis, C.D.; Frigione, D.; Graves, J.; Mantsinen, Mervi; Beaumont, P.; Garcia-Munoz, M.; Perez von Thun, C.; Rodriguez, J.F.R.; Darrow, D.; Keeling, D.; King, D.; McClements, K.G.; Solano, E.R.; Schmuck, S.; Sips, G.; Szepesi, G.; JET Contributors (IOP Publishing, 2018)
      Article
      Open Access
      During development of a high-performance hybrid scenario for future deuterium–tritium experiments on the Joint European Torus, an increased level of fast ion losses in the MeV energy range was observed during the instability ...

    • ICRH physics and technology achievements in JET-ILW 

      Jacquet, P.; van Eester, D.; Lerche, E.; Bobkov, V.; Blackman, T.; Colas, L.; Challis, C.; Czarnecka, A.; Dumortier, P.; Frigione, D.; Durodié, F.; Garzotti, L.; Goniche, M.; Graves, J.; Kazakov, Y.; Kirov, K.; Klepper, C.C.; Krawczyk, N.; Krivska, A.; Mantsinen, Mervi; Monakhov, I.; Nunes, I.; Ongena, J.; Reinke, M.; Rimini, F.; Zhang, W.; JET Contributors (EDP Sciences, 2017-10-23)
      Article
      Open Access
      ICRH was extensively used in the 2015-16 JET-ILW (ITER like wall) experimental campaign; bulk heating together with high-Z impurity chase-out from plasma centre importantly contributed to the good DD fusion performance ...

    • Modelling of combined ICRF and NBI heating in JET hybrid plasmas 

      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; JET Contributors (EDP Sciences, 2017-10-23)
      Article
      Open Access
      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 ...

    • Non-linear MHD Simulation s of Pellet Triggered ELMs in JET and ASDEX Upgrade tokamaks 

      Futatani, Shimpei; Pamela, S.; Huijsmans, G.T.A.; Garzotti, L.; Frigione, D.; Loarte, D.; Hoelzl, M.; Lang, P.T.; Kocsis, G.; Orain, F.; Dunne, M.; Lessig, A.; Mantsinen, Mervi; EUROfusion MST1 Team; ASDEX Upgrade Team; JET Contributors (2016-07-08)
      Open Access
      ITER operation in its high fusion performance DT scenarios relies on the achievement of the H-mode confinement regime, which is expected to lead to the quasi-periodic triggering of ELMs (Edge Localized Modes). ...

    • Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating 

      McClements, K.G.; Brisset, A.; Chapman, B.; Dendy, R.O.; Jacquet, P.; Kiptily, V.G.; Mantsinen, Mervi; Reman, B.C.G.; JET Contributors (IOP Publishing:, 2018-07-10)
      Article
      Open Access
      Measurements are reported of electromagnetic emission close to the cyclotron frequency of energetic ions in JET plasmas heated by waves in the ion cylotron range of frequencies (ICRF). Hydrogen was the majority ion species ...

    • Recent progress in the quantitative validation of JOREK simulations of ELMs in JET 

      Pamela, S.J.P.; Huijsmans, G.T.A.; Eich, T.; Saarelma, Samuli; Lupelli, I.; Maggi, C.F.; Giroud, C.; Chapman, I.T.; Smith, S.F.; Frassinetti, L.; Becoulet, M.; Hoelzl, M.; Orain, F.; Futatani, S.; JET Contributors (IOP Publishing, 2017-05-16)
      Article
      Open Access
      Future devices like JT-60SA, ITER and DEMO require quantitative predictions of pedestal density and temperature levels, as well as inter-ELM and ELM divertor heat fluxes, in order to improve global confinement capabilities ...

    • Synergetic heating of D-NBI ions in the vicinity of the mode conversion layer in H-D plasmas in JET with the ITER like wall 

      Ongena, J.; Kazakov, Ye O.; Baranov, Y.; Hellesen, C.; Eriksson, J.; Johnson, T.; Kiptily, V.G.; Mantsinen, Mervi J.; Nocente, M.; Bilato, R.; Cardinali, A.; Castaldo, C.; Crombé, K.; Czarnecka, A.; Dumont, R.; Faustin, J.; Giacomelli, L.; Goloborodko, V.; Graves, J.; Jacquet, Ph.; Krawczyk, N.; Lerche, E.; Meneses, L.; Nave, M.F.F.; Patten, H.; Schneider, M.; Van Eester, D.; Weisen, H.; Wright, J.C.; JET Contributors (EDP Sciences: EPJ Open Access, 2017-10-23)
      Article
      Open Access
      This paper discusses the extension of the ‘three-ion’ species ICRF technique for heating mixture plasmas using fast injected NBI ions as resonant ‘third’ species. In this scenario the ICRF power is absorbed by the fast ...

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

      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; Solano, Emilia R.; Tsalas, Maximos; Valisa, Marco; JET Contributors (EDP Sciences, 2017-10-23)
      Article
      Open Access
      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 ...