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This paper compares the gyrokinetic instabilities and transport in two representative JET pedestals, one (pulse 78697) from the JET configuration with a carbon wall (C) and another (pulse 92432) from after the installation of JET's ITER-like Wall (ILW). The discharges were selected for a comparison of JET-ILW and JET-C discharges with good confinement at high current (3 MA, corresponding also to low rho(*)) and retain the distinguishing features of JET-C and JET-ILW, notably, decreased pedestal top temperature for JET-ILW. A comparison of the profiles and heating power reveals a stark qualitative difference between the discharges: the JET-ILW pulse (92432) requires twice the heating power, at a gas rate of 1.9 x 10(22) e s(-1), to sustain roughly half the temperature gradient of the JET-C pulse (78697), operated at zero gas rate. This points to heat transport as a central component of the dynamics limiting the JET-ILW pedestal and reinforces the following emerging JET-ILW pedestal transport paradigm, which is proposed for further examination by both theory and experiment. ILW conditions modify the density pedestal in ways that decrease the normalized pedestal density gradient a/L-n, often via an outward shift in relation to the temperature pedestal. This is attributable to some combination of direct metal wall effects and the need for increased fueling to mitigate tungsten contamination. The modification to the density profile increases eta = L-n/L-T, thereby producing more robust ion temperature gradient (ITG) and electron temperature gradient driven instability. The decreased pedestal gradients for JET-ILW (92432) also result in a strongly reduced E x B shear rate, further enhancing the ion scale turbulence. Collectively, these effects limit the pedestal temperature and demand more heating power to achieve good pedestal performance. Our simulations, consistent with basic theoretical arguments, find higher ITG turbulence, stronger stiffness, and higher pedestal transport in the ILW plasma at lower rho(*).
Direct gyrokinetic comparison of pedestal transport in JET with carbon and ITER-like walls
Hatch, D. R.;Kotschenreuther, M.;Mahajan, S. M.;Merlo, G.;Field, A. R.;Giroud, C.;Hillesheim, J. C.;Maggi, C. F.;von Thun, C. Perez;Roach, C. M.;Saarelma, S.;Abduallev, S.;Abhangi, M.;Abreu, P.;Afzal, M.;Aggarwal, K. M.;Ahlgren, T.;Ahn, J. H.;Aho-Mantila, L.;Aiba, N.;Airila, M.;Albanese, R.;Aldred, V.;Alegre, D.;Alessi, E.;Aleynikov, P.;Alfier, A.;Alkseev, A.;Allinson, M.;Alper, B.;Alves, E.;Ambrosino, G.;Ambrosino, R.;Amicucci, L.;Amosov, V.;Sunden, E. Andersson;Angelone, M.;Anghel, M.;Angioni, C.;Appel, L.;Appelbee, C.;Arena, P.;Ariola, M.;Arnichand, H.;Arshad, S.;Ash, A.;Ashikawa, N.;Aslanyan, V.;Asunta, O.;Auriemma, F.;Austin, Y.;Avotina, L.;Axton, M. D.;Ayres, C.;Bacharis, M.;Baciero, A.;Baiao, D.;Bailey, S.;Baker, A.;Balboa, I.;Balden, M.;Balshaw, N.;Bament, R.;Banks, J. W.;Baranov, Y. F.;Barnard, M. A.;Barnes, D.;Barnes, M.;Barnsley, R.;Wiechec, A. Baron;Orte, L. 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M.;Hughes, M.;Huijsmans, G. T. A.;Hunter, C. L.;Huynh, P.;Hynes, A. M.;Iglesias, D.;Imazawa, N.;Imbeaux, F.;Imrisek, M.;Incelli, M.;Innocente, P.;Irishkin, M.;Ivanova-Stanik, I.;Jachmich, S.;Jacobsen, A. S.;Jacquet, P.;Jansons, J.;Jardin, A.;Jarvinen, A.;Jaulmes, F.;Jednorog, S.;Jenkins, I.;Jeong, C.;Jepu, I.;Joffrin, E.;Johnson, R.;Johnson, T.;Johnston, Jane;Joita, L.;Jones, G.;Jones, T. T. C.;Hoshino, K. K.;Kallenbach, A.;Kamiya, K.;Kaniewski, J.;Kantor, A.;Kappatou, A.;Karhunen, J.;Karkinsky, D.;Karnowska, I.;Kaufman, M.;Kaveney, G.;Kazakov, Y.;Kazantzidis, V.;Keeling, D. L.;Keenan, T.;Keep, J.;Kempenaars, M.;Kennedy, C.;Kenny, D.;Kent, J.;Kent, O. N.;Khilkevich, E.;Kim, H. T.;Kim, H. S.;Kinch, A.;King, C.;King, D.;King, R. F.;Kinna, D. J.;Kiptily, V.;Kirk, A.;Kirov, K.;Kirschner, A.;Kizane, G.;Klepper, C.;Klix, A.;Knight, P.;Knipe, S. 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J.;Smithies, M.;Snoj, L.;Soare, S.;Solano, E. R.;Somers, A.;Sommariva, C.;Sonato, P.;Sopplesa, A.;Sousa, J.;Sozzi, C.;Spagnolo, S.;Spelzini, T.;Spineanu, F.;Stables, G.;Stamatelatos, I.;Stamp, M. F.;Staniec, P.;Stankunas, G.;Stan-Sion, C.;Stead, M. J.;Stefanikova, E.;Stepanov, I.;Stephen, A. V.;Stephen, M.;Stevens, A.;Stevens, B. D.;Strachan, J.;Strand, P.;Strauss, H. R.;Strom, P.;Stubbs, G.;Studholme, W.;Subba, F.;Summers, H. P.;Svensson, J.;Swiderski, L.;Szabolics, T.;Szawlowski, M.;Szepesi, G.;Suzuki, T. T.;Tal, B.;Tala, T.;Talbot, A. R.;Talebzadeh, S.;Taliercio, C.;Tamain, P.;Tame, C.;Tang, W.;Tardocchi, M.;Taroni, L.;Taylor, D.;Taylor, K. A.;Tegnered, D.;Telesca, G.;Teplova, N.;Terranova, D.;Testa, D.;Tholerus, E.;Thomas, J.;Thomas, J. D.;Thomas, P.;Thompson, A.;Thompson, C. -A.;Thompson, V. K.;Thorne, L.;Thornton, A.;Thrysoe, A. S.;Tigwell, P. A.;Tipton, N.;Tiseanu, I.;Tojo, H.;Tokitani, M.;Tolias, P.;Tomes, M.;Tonner, P.;Towndrow, M.;Trimble, P.;Tripsky, M.;Tsalas, M.;Tsavalas, P.;Jun, D. Tskhakaya;Turner, I.;Turner, M. M.;Turnyanskiy, M.;Tvalashvili, G.;Tyrrell, S. G. J.;Uccello, A.;Ul-Abidin, Z.;Uljanovs, J.;Ulyatt, D.;Urano, H.;Uytdenhouwen, I.;Vadgama, A. P.;Valcarcel, D.;Valentinuzzi, M.;Valisa, M.;Olivares, P. Vallejos;Valovic, M.;Van De Mortel, M.;Van Eester, D.;Van Renterghem, W.;van Rooij, G. J.;Varje, J.;Varoutis, S.;Vartanian, S.;Vasava, K.;Vasilopoulou, T.;Vega, J.;Verdoolaege, G.;Verhoeven, R.;Verona, C.;Rinati, G. Verona;Veshchev, E.;Vianello, N.;Vicente, J.;Viezzer, E.;Villari, S.;Villone, F.;Vincenzi, P.;Vinyar, I.;Viola, B.;Vitins, A.;Vizvary, Z.;Vlad, M.;Voitsekhovitch, I.;Vondracek, P.;Vora, N.;Vu, T.;Pires de Sa, W. W.;Wakeling, B.;Waldon, C. W. F.;Walkden, N.;Walker, M.;Walker, R.;Walsh, M.;Wang, E.;Wang, N.;Warder, S.;Warren, R. J.;Waterhouse, J.;Watkins, N. 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2019
Abstract
This paper compares the gyrokinetic instabilities and transport in two representative JET pedestals, one (pulse 78697) from the JET configuration with a carbon wall (C) and another (pulse 92432) from after the installation of JET's ITER-like Wall (ILW). The discharges were selected for a comparison of JET-ILW and JET-C discharges with good confinement at high current (3 MA, corresponding also to low rho(*)) and retain the distinguishing features of JET-C and JET-ILW, notably, decreased pedestal top temperature for JET-ILW. A comparison of the profiles and heating power reveals a stark qualitative difference between the discharges: the JET-ILW pulse (92432) requires twice the heating power, at a gas rate of 1.9 x 10(22) e s(-1), to sustain roughly half the temperature gradient of the JET-C pulse (78697), operated at zero gas rate. This points to heat transport as a central component of the dynamics limiting the JET-ILW pedestal and reinforces the following emerging JET-ILW pedestal transport paradigm, which is proposed for further examination by both theory and experiment. ILW conditions modify the density pedestal in ways that decrease the normalized pedestal density gradient a/L-n, often via an outward shift in relation to the temperature pedestal. This is attributable to some combination of direct metal wall effects and the need for increased fueling to mitigate tungsten contamination. The modification to the density profile increases eta = L-n/L-T, thereby producing more robust ion temperature gradient (ITG) and electron temperature gradient driven instability. The decreased pedestal gradients for JET-ILW (92432) also result in a strongly reduced E x B shear rate, further enhancing the ion scale turbulence. Collectively, these effects limit the pedestal temperature and demand more heating power to achieve good pedestal performance. Our simulations, consistent with basic theoretical arguments, find higher ITG turbulence, stronger stiffness, and higher pedestal transport in the ILW plasma at lower rho(*).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3357358
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
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