☆ 4.4 Article

Multi-scale physics mechanisms and spontaneous edge transport bifurcations in fusion plasmas

EPL (2009)

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EPL
卷 87, 期 5, 页码 -

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EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/87/55002

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Physics, Multidisciplinary

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  1. Ministerio de Educacion y Ciencia of Spain [ENE2006-15244-C03-02]

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The magnitude of radial transport in magnetic confinement devices for controlled nuclear fusion suffers spontaneous bifurcations when specific system parameter values are exceeded. Here we show, for the first time, that the correlation length of the plasma potential becomes of the order of the machine size during the edge bifurcation itself, quite unlike the density fluctuations. The mechanism governing the development of this bifurcation, leading to the establishment of an edge transport barrier, is still one of the main scientific conundrums facing the magnetic fusion community after more than twenty years of intense research. The results presented here show the dominant role of long-range correlations when approaching the Low to High confinement edge transition in fusion plasmas. This is in line with the expectation that multi-scale interactions are a crucial ingredient of complex dynamics in many non-equilibrium systems. Copyright (C) EPLA, 2009

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Goncalves, M. Goniche, A. Goodyear, S. Gore, G. Gorini, T. Goerler, N. Gotts, R. Goulding, E. Gow, B. Graham, J. P. Graves, H. Greuner, B. Grierson, J. Griffiths, S. Griph, D. Grist, W. Gromelski, M. Groth, R. Grove, M. Gruca, D. Guard, N. Gupta, C. Gurl, A. Gusarov, L. Hackett, S. Hacquin, R. Hager, L. Hagg, A. Hakola, M. Halitovs, S. Hall, S. A. Hall, S. Hallworth-Cook, C. J. Ham, D. Hamaguchi, M. Hamed, C. Hamlyn-Harris, K. Hammond, E. Harford, J. R. Harrison, D. Harting, Y. Hatano, D. R. Hatch, T. Haupt, J. Hawes, N. C. Hawkes, J. Hawkins, T. Hayashi, S. Hazael, S. Hazel, P. Heesterman, B. Heidbrink, W. Helou, O. Hemming, S. S. Henderson, R. B. Henriques, D. Hepple, J. Herfindal, G. Hermon, J. Hill, J. C. Hillesheim, K. Hizanidis, A. Hjalmarsson, A. Ho, J. Hobirk, O. Hoenen, C. Hogben, A. Hollingsworth, S. Hollis, E. Hollmann, M. Holzl, B. Homan, M. Hook, D. Hopley, D. Horsley, N. Horsten, A. Horton, L. D. Horton, L. Horvath, S. Hotchin, R. Howell, Z. Hu, A. Huber, V Huber, T. Huddleston, G. T. A. Huijsmans, P. Huynh, A. Hynes, M. Iliasova, D. Imrie, M. Imrisek, J. Ingleby, P. Innocente, K. Insulander Bjork, N. Isernia, I. Ivanova-Stanik, E. Ivings, S. Jablonski, S. Jachmich, T. Jackson, P. Jacquet, H. Jarleblad, F. Jaulmes, J. Jenaro Rodriguez, I Jepu, E. Joffrin, R. Johnson, T. Johnson, J. Johnston, C. Jones, G. Jones, L. Jones, N. Jones, T. Jones, A. Joyce, R. Juarez, M. Juvonen, T. Kaltiaisenaho, J. Kaniewski, A. Kantor, A. Kappatou, J. Karhunen, D. Karkinsky, Yu Kashchuk, M. Kaufman, G. Kaveney, Ye O. Kazakov, V Kazantzidis, D. L. Keeling, R. Kelly, M. Kempenaars, C. Kennedy, D. Kennedy, J. Kent, K. Khan, E. Khilkevich, C. Kiefer, J. Kilpelainen, C. Kim, Hyun-Tae Kim, S. H. Kim, D. B. King, R. King, D. Kinna, V. G. Kiptily, A. Kirjasuo, K. K. Kirov, A. Kirschner, T. Kiviniemi, G. Kizane, M. Klas, C. Klepper, A. Klix, G. Kneale, M. Knight, P. Knight, R. Knights, S. Knipe, M. Knolker, S. Knott, M. Kocan, F. Kochl, I Kodeli, Y. Kolesnichenko, Y. Kominis, M. Kong, V Korovin, B. Kos, D. Kos, H. R. Koslowski, M. Kotschenreuther, M. Koubiti, K. Koziol, A. Krasilnikov, V Krasilnikov, M. Kresina, K. Krieger, N. Krishnan, A. Krivska, U. Kruezi, A. B. Kukushkin, H. Kumpulainen, T. Kurki-Suonio, H. Kurotaki, S. Kwak, O. J. Kwon, L. Laguardia, E. Lagzdina, A. Lahtinen, A. Laing, N. Lam, H. T. Lambertz, B. Lane, C. Lane, E. Lascas Neto, K. D. Lawson, A. Lazaros, E. Lazzaro, G. Learoyd, Chanyoung Lee, S. E. Lee, S. Leerink, T. Leeson, X. Lefebvre, H. J. Leggate, J. Lehmann, M. Lehnen, D. Leichtle, F. Leipold, I Lengar, M. Lennholm, E. Leon Gutierrez, B. Lepiavko, J. Leppanen, E. Lerche, A. Lescinskis, J. Lewis, W. Leysen, L. Li, Y. Li, J. Likonen, Ch Linsmeier, B. Lipschultz, X. Litaudon, E. Litherland-Smith, F. Liu, T. Loarer, A. Loarte, R. Lobel, B. Lomanowski, P. J. Lomas, J. M. Lopez, R. Lorenzini, S. Loreti, U. Losada, V. P. Loschiavo, M. Loughlin, Z. Louka, J. Lovell, T. Lowe, C. Lowry, S. Lubbad, T. Luce, R. Lucock, A. Lukin, C. Luna, E. de la Luna, M. Lungaroni, C. P. Lungu, T. Lunt, V Lutsenko, B. Lyons, A. Lyssoivan, M. Machielsen, E. Macusova, R. Maenpaa, C. F. Maggi, R. Maggiora, M. Magness, S. Mahesan, H. Maier, R. Maingi, K. Malinowski, P. Manas, P. Mantica, M. J. Mantsinen, J. Manyer, A. Manzanares, Ph Maquet, G. Marceca, N. Marcenko, C. Marchetto, O. Marchuk, A. Mariani, G. Mariano, M. Marin, M. Marinelli, T. Markovic, D. Marocco, L. Marot, S. Marsden, J. Marsh, R. Marshall, L. Martellucci, A. Martin, A. J. Martin, R. Martone, S. Maruyama, M. Maslov, S. Masuzaki, S. Matejcik, M. Mattei, G. F. Matthews, D. Matveev, E. Matveeva, A. Mauriya, F. Maviglia, M. Mayer, M-L Mayoral, S. Mazzi, C. Mazzotta, R. McAdams, P. J. McCarthy, K. G. McClements, J. McClenaghan, P. McCullen, D. C. McDonald, D. McGuckin, D. McHugh, G. McIntyre, R. McKean, J. McKehon, B. McMillan, L. McNamee, A. McShee, A. Meakins, S. Medley, C. J. Meekes, K. Meghani, A. G. Meigs, G. Meisl, S. Meitner, S. Menmuir, K. Mergia, S. Merriman, Ph Mertens, S. Meshchaninov, A. Messiaen, R. Michling, P. Middleton, D. Middleton-Gear, J. Mietelski, D. Milanesio, E. Milani, F. Militello, A. Militello Asp, J. Milnes, A. Milocco, G. Miloshevsky, C. Minghao, S. Minucci, I Miron, M. Miyamoto, J. Mlynar, V Moiseenko, P. Monaghan, I Monakhov, T. Moody, S. Moon, R. Mooney, S. Moradi, J. Morales, R. B. Morales, S. Mordijck, L. Moreira, L. Morgan, F. Moro, J. Morris, K-M Morrison, L. Msero, D. Moulton, T. Mrowetz, T. Mundy, M. Muraglia, A. Murari, A. Muraro, N. Muthusonai, Yong-Su Na, F. Nabais, M. Naden, J. Naish, R. Naish, F. Napoli, E. Nardon, V Naulin, M. F. F. Nave, I Nedzelskiy, G. Nemtsev, V Nesenevich, I Nestoras, R. Neu, V. S. Neverov, S. Ng, M. Nicassio, A. H. Nielsen, D. Nina, D. Nishijima, C. Noble, C. R. Nobs, M. Nocente, D. Nodwell, K. Nordlund, H. Nordman, R. Normanton, J. M. Noterdaeme, S. Nowak, E. Nunn, H. Nystrom, M. Oberparleiter, B. Obryk, J. O'Callaghan, T. Odupitan, H. J. C. Oliver, R. Olney, M. O'Mullane, J. Ongena, E. Organ, F. Orsitto, J. Orszagh, T. Osborne, R. Otin, T. Otsuka, A. Owen, Y. Oya, M. Oyaizu, R. Paccagnella, N. Pace, L. W. Packer, S. Paige, E. Pajuste, D. Palade, S. J. P. Pamela, N. Panadero, E. Panontin, A. Papadopoulos, G. Papp, P. Papp, V. V. Parail, C. Pardanaud, J. Parisi, F. Parra Diaz, A. Parsloe, M. Parsons, N. Parsons, M. Passeri, A. Patel, A. Pau, G. Pautasso, R. Pavlichenko, A. Pavone, E. Pawelec, C. Paz Soldan, A. Peacock, M. Pearce, E. Peluso, C. Penot, K. Pepperell, R. Pereira, T. Pereira, E. Perelli Cippo, P. Pereslavtsev, C. Perez von Thun, V Pericoli, D. Perry, M. Peterka, P. Petersson, G. Petravich, N. Petrella, M. Peyman, M. Pillon, S. Pinches, G. Pintsuk, W. Pires de Sa, A. Pires dos Reis, C. Piron, L. Pionr, A. Pironti, R. Pitts, K. L. van de Plassche, N. Platt, V Plyusnin, M. Podesta, G. Pokol, F. M. Poli, O. G. Pompilian, S. Popovichev, M. Poradzinski, M. T. Porfiri, M. Porkolab, C. Porosnicu, M. Porton, G. Poulipoulis, I Predebon, G. Prestopino, C. Price, D. Price, M. Price, D. Primetzhofer, P. Prior, G. Provatas, G. Pucella, P. Puglia, K. Purahoo, I Pusztai, O. Putignano, T. Puetterich, A. Quercia, E. Rachlew, G. Radulescu, V Radulovic, M. Rainford, P. Raj, G. Ralph, G. Ramogida, D. Rasmussen, J. J. Rasmussen, G. Ratta, S. Ratynskaia, M. Rebai, D. Refy, R. Reichle, M. Reinke, D. Reiser, C. Reux, S. Reynolds, M. L. Richiusa, S. Richyal, D. Rigamonti, F. G. Rimini, J. Risner, M. Riva, J. Rivero-Rodriguez, C. M. Roach, R. Robins, S. Robinson, D. Robson, R. Rodionov, P. Rodrigues, M. Rodriguez Ramos, P. Rodriguez-Fernandez, F. Romanelli, M. Romanelli, S. Romanelli, J. Romazanov, R. Rossi, S. Rowe, D. Rowlands, M. Rubel, G. Rubinacci, G. Rubino, L. Ruchko, M. Ruiz, J. Ruiz Ruiz, C. Ruset, J. Rzadkiewicz, S. Saarelma, E. Safi, A. Sahlberg, M. Salewski, A. Salmi, R. Salmon, F. Salzedas, I Sanders, D. Sandiford, B. Santos, A. Santucci, K. Sarkimaki, R. Sarwar, I Sarychev, O. Sauter, P. Sauwan, N. Scapin, F. Schluck, K. Schmid, S. Schmuck, M. Schneider, P. A. Schneider, D. Schworer, G. Scott, M. Scott, D. Scraggs, S. Scully, M. Segato, Jaemin Seo, G. Sergienko, M. Sertoli, S. E. Sharapov, A. Shaw, H. Sheikh, U. Sheikh, A. Shepherd, A. Shevelev, P. Shigin, K. Shinohara, S. Shiraiwa, D. Shiraki, M. Short, G. Sias, S. A. Silburn, A. Silva, C. Silva, J. Silva, D. Silvagni, D. Simfukwe, J. Simpson, D. Sinclair, S. K. Sipila, A. C. C. Sips, P. Siren, A. Sirinelli, H. Sjostrand, N. Skinner, J. Slater, N. Smith, P. Smith, J. Snell, G. Snoep, L. Snoj, P. Snyder, S. Soare, E. R. Solano, V Solokha, A. Somers, C. Sommariva, K. Soni, E. Sorokovoy, M. Sos, J. Sousa, C. Sozzi, S. Spagnolo, T. Spelzini, F. Spineanu, D. Spong, D. Sprada, S. Sridhar, C. Srinivasan, G. Stables, G. Staebler, I Stamatelatos, Z. Stancar, P. Staniec, G. Stankunas, M. Stead, E. Stefanikova, A. Stephen, J. Stephens, P. Stevenson, M. Stojanov, P. Strand, H. R. Strauss, S. Strikwerda, P. Strom, C. Stuart, W. Studholme, M. Subramani, E. Suchkov, S. Sumida, H. J. Sun, T. E. Susts, J. Svensson, J. Svoboda, R. Sweeney, D. Sytnykov, T. Szabolics, G. Szepesi, B. Tabia, T. Tadic, B. Tal, T. Tala, A. Tallargio, P. Tamain, H. Tan, K. Tanaka, W. Tang, M. Tardocchi, D. Taylor, A. S. Teimane, G. Telesca, N. Teplova, A. Teplukhina, D. Terentyev, A. Terra, D. Terranova, N. Terranova, D. Testa, E. Tholerus, J. Thomas, E. Thoren, A. Thorman, W. Tierens, R. A. Tinguely, A. Tipton, H. Todd, M. Tokitani, P. Tolias, M. Tomes, A. Tookey, Y. Torikai, U. von Toussaint, P. Tsavalas, D. Tskhakaya, I Turner, M. Turner, M. M. Turner, M. Turnyanskiy, G. Tvalashvili, S. Tyrrell, M. Tyshchenko, A. Uccello, V Udintsev, G. Urbanczyk, A. Vadgama, D. Valcarcel, M. Valisa, P. Vallejos Olivares, O. Vallhagen, D. Van Eester, J. Varje, S. Vartanian, T. Vasilopoulou, G. Vayakis, M. Vecsei, J. Vega, S. Ventre, G. Verdoolaege, C. Verona, G. Verona Rinati, E. Veshchev, N. Vianello, E. Viezzer, L. Vignitchouk, R. Vila, R. Villari, F. Villone, P. Vincenzi, I Vinyar, B. Viola, A. J. Virtanen, A. Vitins, Z. Vizvary, G. Vlad, M. Vlad, P. Vondracek, P. de Vries, B. Wakeling, N. R. Walkden, M. Walker, R. Walker, M. Walsh, E. Wang, N. Wang, S. Warder, R. Warren, J. Waterhouse, C. Watts, T. Wauters, A. Weckmann, H. Wedderburn Maxwell, M. Weiland, H. Weisen, M. Weiszflog, P. Welch, N. Wendler, A. West, M. Wheatley, S. Wheeler, A. Whitehead, D. Whittaker, A. Widdowson, S. Wiesen, J. Wilkinson, J. C. Williams, D. Willoughby, I Wilson, J. Wilson, T. Wilson, M. Wischmeier, P. Wise, G. Withenshaw, A. Withycombe, D. Witts, A. Wojcik-Gargula, E. Wolfrum, R. Wood, C. Woodley, R. Woodley, B. Woods, J. Wright, J. C. Wright, T. Xu, D. Yadikin, M. Yajima, Y. Yakovenko, Y. Yang, W. Yanling, V Yanovskiy, I Young, R. Young, R. J. Zabolockis, J. Zacks, R. Zagorski, F. S. Zaitsev, L. Zakharov, A. Zarins, D. Zarzoso Fernandez, K-D Zastrow, Y. Zayachuk, M. Zerbini, W. Zhang, Y. Zhou, M. Zlobinski, A. Zocco, A. Zohar, V Zoita, S. Zoletnik, V. K. Zotta, I Zoulias, W. Zwingmann, I Zychor

Summary: The JET 2019-2020 scientific and technological programme made use of previous scientific and engineering work to achieve significant research results. The focus was on scenarios for high fusion power and alpha particle physics, consequences of long-term exposure to JET-ILW plasma, and the nuclear technology programme for maximum technological return.

NUCLEAR FUSION (2022)

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Article Physics, Fluids & Plasmas

On the role of density fluctuations in the core turbulent transport of Wendelstein 7-X

D. Carralero, T. Estrada, E. Maragkoudakis, T. Windisch, J. A. Alonso, J. L. Velasco, O. Ford, M. Jakubowski, S. Lazerson, M. Beurskens, S. Bozhenkov, I Calvo, H. Damm, G. Fuchert, J. M. Garcia-Regana, U. Hoefel, N. Marushchenko, N. Pablant, E. Sanchez, H. M. Smith, E. Pasch, T. Stange

Summary: A study in the W7-X found that suppressing turbulence by reducing eta(i) can reduce ion turbulent transport and improve global performance, while reducing turbulence by lowering collisionality does not affect transport or confinement.

PLASMA PHYSICS AND CONTROLLED FUSION (2022)

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Article Physics, Fluids & Plasmas

Rational surfaces, flows and radial structure in the TJ-II stellarator

B. Ph van Milligen, I Voldiner, B. A. Carreras, L. Garcia, M. A. Ochando

Summary: In this study, we measured turbulent quantities inside the plasma edge in the TJ-II stellarator using a Langmuir probe during rotational transform scans. We found that the poloidal plasma velocity and radial electric field have a radial structure that relates to the rotational transform profile and lowest order rational surfaces. The particle flux and flow shear suppression term also exhibit a radial pattern, but their relation to the low-order rational surfaces is less clear. The results suggest the presence of an unknown term, the instability growth rate, in the turbulence evolution equation.

NUCLEAR FUSION (2023)

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Article Physics, Fluids & Plasmas

On the interaction between the island divertor heat fluxes, the scrape-off layer radial electric field and the edge turbulence in Wendelstein 7-X plasmas

E. Maragkoudakis, D. Carralero, T. Estrada, T. Windisch, Y. Gao, C. Killer, M. Jakubowski, A. Puig Sitjes, F. Pisano, H. Sandor, M. Vecsei, S. Zoletnik, A. Cappa

Summary: The formation of the radial electric field in the scrape-off layer (SOL) in stellarator W7-X was experimentally studied. Simple models developed in tokamaks were tested for their validity in a complex 3D island divertor. The formation of the electric field follows a similar pattern to tokamaks, and the gradient of the electric field at the edge is linked to a reduction in density fluctuations.

NUCLEAR FUSION (2023)

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Review Multidisciplinary Sciences

H-mode transition in the TJ-II stellarator plasmas

Teresa Estrada, Carlos Hidalgo, TJ II team

Summary: Since the first H-mode transitions were observed in TJ-II plasmas in 2008, extensive experimental efforts have been made to understand the physics of confinement transitions better. This article presents an overview of the main findings related to the L-H transition in TJ-II, including the driving mechanism of the radial electric field, the possible mechanisms for turbulence suppression, and the temporal and spatial scales that can impact the transition. Experimental evidence supports the role of zonal flows in mediating the L-H transition and suggests other mechanisms beyond local sheared flows for turbulence suppression at the transition.

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2023)

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Article Engineering, Electrical & Electronic

Analysis of the blackout risk reduction when segmenting large power systems using lines with controllable power flow

D. Gomila, B. A. Carreras, J. M. Reynolds-Barredo, P. Colet, O. Gomis-Bellmunt

Summary: Segmenting large power grids using controllable lines, such as high-voltage direct-current lines, can reduce the risk of large-scale blackouts caused by cascading failures.

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS (2023)

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Article Physics, Fluids & Plasmas

The role of isotope mass and transport for H-mode access in tritium containing plasmas at JET with ITER-like wall

G. Birkenmeier, E. R. Solano, I. S. Carvalho, J. C. Hillesheim, E. Delabie, E. Lerche, D. Taylor, D. Gallart, M. J. Mantsinen, C. Silva, C. Angioni, F. Ryter, P. Carvalho, M. Fontana, E. Pawelec, S. A. Silburn, P. Siren, S. Aleiferis, J. Bernardo, A. Boboc, D. Douai, P. Puglia, P. Jacquet, E. Litherland-Smith, I Jepu, D. Kos, H. J. Sun, A. Shaw, D. King, B. Viola, R. Henriques, K. K. Kirov, M. Baruzzo, J. Garcia, A. Hakola, A. Huber, E. Joffrin, D. Keeling, A. Kappatou, M. Lennholm, P. Lomas, E. de la Luna, C. F. Maggi, J. Mailloux, M. Maslov, F. G. Rimini, N. Vianello, G. Verdoolaege, H. Weisen, M. Wischmeier

Summary: The required heating power for accessing the H-mode in tritium containing plasmas was investigated under specific conditions. It was found that the heating power threshold varied for different isotope compositions, indicating that the effective isotope mass alone is not sufficient to describe the isotope effect. The electron temperature profiles were similar for all isotopes and mixtures, despite the significant variation in the power threshold.

PLASMA PHYSICS AND CONTROLLED FUSION (2023)

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Article Physics, Fluids & Plasmas

L-H transition studies in tritium and deuterium-tritium campaigns at JET with Be wall and W divertor

E. R. Solano, G. Birkenmeier, C. Silva, E. Delabie, J. C. Hillesheim, A. Baciero, I. Balboa, M. Baruzzo, A. Boboc, M. Brix, J. Bernardo, C. Bourdelle, I. S. Carvalho, P. Carvalho, C. D. Challis, M. Chernyshova, A. Chomiczewska, R. Coelho, I. Coffey, T. Craciunescu, E. de la Cal, E. de la Luna, R. Dumont, P. Dumortier, M. Fontana, J. M. Fontdecaba, L. Frassinetti, D. Gallart, J. Garcia, C. Giroud, W. Gromelski, R. B. Henriques, J. Hall, A. Ho, L. D. Horton, L. Horvath, P. Jacquet, I. Jepu, E. Joffrin, A. Kappatou, D. L. Keeling, D. B. King, V. G. Kiptily, K. K. Kirov, D. Kos, E. Kowalska-Strzeciwilk, M. Lennholm, E. Lerche, E. Litherland-Smith, A. Loarte, B. Lomanowski, P. J. Lomas, C. F. Maggi, J. Mailloux, M. J. Mantsinen, M. Maslov, A. G. Meigs, I. Monakhov, R. B. Morales, A. H. Nielsen, D. Nina, C. Noble, E. Pawelec, M. Poradzinski, G. Pucella, P. Puglia, D. Refy, J. Juul Rasmussen, E. Righi, F. G. Rimini, T. Robinson, M. Sertoli, S. A. Silburn, G. Sips, P. Siren, Z. Stancar, H. J. Sun, G. Szepesi, D. Taylor, E. Tholerus, B. Thomas, G. Verdoolaege, P. Vincenzi, B. Viola, N. Vianello, T. Wilson

Summary: The recent deuterium-tritium campaign in JET-ILW has provided an opportunity to study the isotope dependence of the L-H power threshold. The results show that the value of the line averaged density at which the threshold is minimum changes as the plasma isotopic composition changes, confirming previous expectations.

NUCLEAR FUSION (2023)

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Article Physics, Fluids & Plasmas

Enhanced confinement induced by pellet injection in the stellarator TJ-II

I. Garcia-Cortes, K. J. McCarthy, T. Estrada, V. Tribaldos, D. Medina-Roque, B. van Milligen, E. Ascasibar, R. Carrasco, A. A. Chmyga, R. Garcia, J. Hernandez-Sanchez, C. Hidalgo, A. S. Kozachek, F. Medina, M. A. Ochando, J. L. de Pablos, N. Panadero, I. Pastor

Summary: Enhanced confinement is observed in neutral beam injector (NBI)-heated hydrogen discharges in the stellarator TJ-II after the injection of a single cryogenic fuel pellet into the plasma core. The plasma's diamagnetic energy content and the energy confinement time are increased compared to similar discharges without pellet injection (PI). Moreover, the triple product n(e) center dot T-i center dot tau(E)diag exhibits a clear bifurcation point toward improved confinement.

PHYSICS OF PLASMAS (2023)

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Article Physics, Fluids & Plasmas

The effect of pellet injection on turbulent transport in TJ-II

L. Garcia, I. Garcia-Cortes, B. A. Carreras, K. J. Mccarthy, B. Ph. van Milligen

Summary: The improvement in confinement associated with the injection of pellets has been observed in TJ-II and other devices. A simple model is used to study the modification of turbulent transport by pellet injection and its effect on particle confinement time. The analysis of the results shows the relationship between the confinement improvement and the evolution of shear flow due to turbulence, particularly near low order rational surfaces.

PHYSICS OF PLASMAS (2023)

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