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Overview of ASDEX Upgrade results

A. Kallenbach, D. Aguiam, L. Aho-Mantila, C. Angioni, N. Arden, R. Arredondo Parra, O. Asunta, M. de Baar, M. Balden, K. Behler, et al. (2017) NUCLEAR FUSION. 57(10).
abstract
The ASDEX Upgrade (AUG) programme is directed towards physics input to critical elements of the ITER design and the preparation of ITER operation, as well as addressing physics issues for a future DEMO design. Since 2015, AUG is equipped with a new pair of 3-strap ICRF antennas, which were designed for a reduction of tungsten release during ICRF operation. As predicted, a factor two reduction on the ICRF-induced W plasma content could be achieved by the reduction of the sheath voltage at the antenna limiters via the compensation of the image currents of the central and side straps in the antenna frame. There are two main operational scenario lines in AUG. Experiments with low collisionality, which comprise current drive, ELM mitigation/suppression and fast ion physics, are mainly done with freshly boronized walls to reduce the tungsten influx at these high edge temperature conditions. Full ELM suppression and non-inductive operation up to a plasma current of I-p = 0.8 MA could be obtained at low plasma density. Plasma exhaust is studied under conditions of high neutral divertor pressure and separatrix electron density, where a fresh boronization is not required. Substantial progress could be achieved for the understanding of the confinement degradation by strong D puffing and the improvement with nitrogen or carbon seeding. Inward/outward shifts of the electron density profile relative to the temperature profile effect the edge stability via the pressure profile changes and lead to improved/decreased pedestal performance. Seeding and D gas puffing are found to effect the core fueling via changes in a region of high density on the high field side (HFSHD). The integration of all above mentioned operational scenarios will be feasible and naturally obtained in a large device where the edge is more opaque for neutrals and higher plasma temperatures provide a lower collisionality. The combination of exhaust control with pellet fueling has been successfully demonstrated. High divertor enrichment values of nitrogen E-N >= 10 have been obtained during pellet injection, which is a prerequisite for the simultaneous achievement of good core plasma purity and high divertor radiation levels. Impurity accumulation observed in the all-metal AUG device caused by the strong neoclassical inward transport of tungsten in the pedestal is expected to be relieved by the higher neoclassical temperature screening in larger devices.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
keyword
nuclear fusion, tokamak physics, ITER, DEMO
journal title
NUCLEAR FUSION
Nucl. Fusion
volume
57
issue
10
article number
102015
pages
12 pages
publisher
Iop Publishing Ltd
place of publication
Bristol
Web of Science type
Article
Web of Science id
000404620600004
ISSN
0029-5515
1741-4326
DOI
10.1088/1741-4326/aa64f6
language
English
UGent publication?
yes
classification
A1
copyright statement
I don't know the status of the copyright for this publication
id
8530313
handle
http://hdl.handle.net/1854/LU-8530313
date created
2017-09-05 12:03:13
date last changed
2017-09-08 07:24:28
@article{8530313,
  abstract     = {The ASDEX Upgrade (AUG) programme is directed towards physics input to critical elements of the ITER design and the preparation of ITER operation, as well as addressing physics issues for a future DEMO design. Since 2015, AUG is equipped with a new pair of 3-strap ICRF antennas, which were designed for a reduction of tungsten release during ICRF operation. As predicted, a factor two reduction on the ICRF-induced W plasma content could be achieved by the reduction of the sheath voltage at the antenna limiters via the compensation of the image currents of the central and side straps in the antenna frame. There are two main operational scenario lines in AUG. Experiments with low collisionality, which comprise current drive, ELM mitigation/suppression and fast ion physics, are mainly done with freshly boronized walls to reduce the tungsten influx at these high edge temperature conditions. Full ELM suppression and non-inductive operation up to a plasma current of I-p = 0.8 MA could be obtained at low plasma density. Plasma exhaust is studied under conditions of high neutral divertor pressure and separatrix electron density, where a fresh boronization is not required. Substantial progress could be achieved for the understanding of the confinement degradation by strong D puffing and the improvement with nitrogen or carbon seeding. Inward/outward shifts of the electron density profile relative to the temperature profile effect the edge stability via the pressure profile changes and lead to improved/decreased pedestal performance. Seeding and D gas puffing are found to effect the core fueling via changes in a region of high density on the high field side (HFSHD). The integration of all above mentioned operational scenarios will be feasible and naturally obtained in a large device where the edge is more opaque for neutrals and higher plasma temperatures provide a lower collisionality. The combination of exhaust control with pellet fueling has been successfully demonstrated. High divertor enrichment values of nitrogen E-N {\textrangle}= 10 have been obtained during pellet injection, which is a prerequisite for the simultaneous achievement of good core plasma purity and high divertor radiation levels. Impurity accumulation observed in the all-metal AUG device caused by the strong neoclassical inward transport of tungsten in the pedestal is expected to be relieved by the higher neoclassical temperature screening in larger devices.},
  articleno    = {102015},
  author       = {Kallenbach, A. and Aguiam, D. and Aho-Mantila, L. and Angioni, C. and Arden, N. and Parra, R. Arredondo and Asunta, O. and de Baar, M. and Balden, M. and Behler, K. and Bergmann, A. and Bernardo, J. and Bernert, M. and Beurskens, M. and Biancalani, A. and Bilato, R. and Birkenmeier, G. and Bobkov, V. and Bock, A. and Bogomolov, A. and Bolzonella, T. and Boswirth, B. and Bottereau, C. and Bottino, A. and van den Brand, H. and Brezinsek, S. and Brida, D. and Brochard, F. and Bruhn, C. and Buchanan, J. and Buhler, A. and Burckhart, A. and Cambon-Silva, D. and Camenen, Y. and Carvalho, P. and Carrasco, G. and Cazzaniga, C. and Carr, M. and Carralero, D. and Casali, L. and Castaldo, C. and Cavedon, M. and Challis, C. and Chankin, A. and Chapman, I. and Clairet, F. and Classen, I. and Coda, S. and Coelho, R. and Coenen, J. W. and Colas, L. and Conway, G. and Costea, S. and Coster, D. P. and Croci, G. and Cseh, G. and Czarnecka, A. and D'Arcangelo, O. and Day, C. and Delogu, R. and de Marne, P. and Denk, S. and Denner, P. and Dibon, M. and D'Inca, R. and Di Siena, A. and Douai, D. and Drenik, A. and Drube, R. and Dunne, M. and Duval, B. P. and Dux, R. and Eich, T. and Elgeti, S. and Engelhardt, K. and Erdos, B. and Erofeev, I. and Esposito, B. and Fable, E. and Faitsch, M. and Fantz, U. and Faugel, H. and Felici, F. and Fietz, S. and Figueredo, A. and Fischer, R. and Ford, O. and Frassinetti, L. and Freethy, S. and Froschle, M. and Fuchert, G. and Fuchs, J. C. and Funfgelder, H. and Galazka, K. and Galdon-Quiroga, J. and Gallo, A. and Gao, Y. and Garavaglia, S. and Garcia-Munoz, M. and Geiger, B. and Cianfarani, C. and Giannone, L. and Giovannozzi, E. and Gleason-Gonzalez, C. and Gloggler, S. and Gobbin, M. and Gorler, T. and Goodman, T. and Gorini, G. and Gradic, D. and Grater, A. and Granucci, G. and Greuner, H. and Griener, M. and Groth, M. and Gude, A. and Gunter, S. and Guimarais, L. and Haas, G. and Hakola, A. H. and Ham, C. and Happel, T. and Harrison, J. and Hatch, D. and Hauer, V. and Hayward, T. and Heinemann, B. and Heinzel, S. and Hellsten, T. and Henderson, S. and Hennequin, P. and Herrmann, A. and Heyn, E. and Hitzler, F. and Hobirk, J. and Holzl, M. and Hoschen, T. and Holm, J. H. and Hopf, C. and Hoppe, F. and Horvath, L. and Houben, A. and Huber, A. and Igochine, V. and Ilkei, T. and Ivanova-Stanik, I. and Jacob, W. and Jacobsen, A. S. and Jacquot, J. and Janky, F. and Jardin, A. and Jaulmes, F. and Jenko, F. and Jensen, T. and Joffrin, E. and Kasemann, C. and Kallenbach, A. and Kalvin, S. and Kantor, M. and Kappatou, A. and Kardaun, O. and Karhunen, J. and Kasilov, S. and Kernbichler, W. and Kim, D. and Kimmig, S. and Kirk, A. and Klingshirn, H. -J. and Koch, F. and Kocsis, G. and Kohn, A. and Kraus, M. and Krieger, K. and Krivska, A. and Kramer-Flecken, A. and Kurki-Suonio, T. and Kurzan, B. and Lackner, K. and Laggner, F. and Lang, P. T. and Lauber, P. and Lazanyi, N. and Lazaros, A. and Lebschy, A. and Li, L. and Li, M. and Liang, Y. and Lipschultz, B. and Liu, Y. and Lohs, A. and Luhmann, N. C. and Lunt, T. and Lyssoivan, A. and Madsen, J. and Maier, H. and Maj, O. and Mailloux, J. and Maljaars, E. and Manas, P. and Mancini, A. and Manhard, A. and Manso, M. -E. and Mantica, P. and Mantsinen, M. and Manz, P. and Maraschek, M. and Martens, C. and Martin, P. and Marrelli, L. and Martitsch, A. and Mastrostefano, S. and Mayer, A. and Mayer, M. and Mazon, D. and McCarthy, P. J. and McDermott, R. and Meisl, G. and Meister, H. and Medvedeva, A. and Merkel, P. and Merkel, R. and Merle, A. and Mertens, V. and Meshcheriakov, D. and Meyer, H. and Meyer, O. and Miettunen, J. and Milanesio, D. and Mink, F. and Mlynek, A. and Monaco, F. and Moon, C. and Nazikian, R. and Nemes-Czopf, A. and Neu, G. and Neu, R. and Nielsen, A. H. and Nielsen, S. K. and Nikolaeva, V. and Nocente, M. and Noterdaeme, Jean-Marie and Nowak, S. and Oberkofler, M. and Oberparleiter, M. and Ochoukov, R. and Odstrcil, T. and Olsen, J. and Orain, F. and Palermo, F. and Papp, G. and Perez, I. Paradela and Pautasso, G. and Enzel, F. and Petersson, P. and Pinzon, J. and Piovesan, P. and Piron, C. and Plaum, B. and Plockl, B. and Plyusnin, V. and Pokol, G. and Poli, E. and Porte, L. and Potzel, S. and Prisiazhniuk, D. and Putterich, T. and Ramisch, M. and Rapson, C. and Rasmussen, J. and Raupp, G. and Refy, D. and Reich, M. and Reimold, F. and Ribeiro, T. and Riedl, R. and Rittich, D. and Rocchi, G. and Rodriguez-Ramos, M. and Rohde, V. and Ross, A. and Rott, M. and Rubel, M. and Ryan, D. and Ryter, F. and Saarelma, S. and Salewski, M. and Salmi, A. and Sanchis-Sanchez, L. and Santos, G. and Santos, J. and Sauter, O. and Scarabosio, A. and Schall, G. and Schmid, K. and Schmitz, O. and Schneider, P. A. and Schneller, M. and Schrittwieser, R. and Schubert, M. and Schwarz-Selinger, T. and Schweinzer, J. and Scott, B. and Sehmer, T. and Sertoli, M. and Shabbir, A. and Shalpegin, A. and Shao, L. and Sharapov, S. and Siccinio, M. and Sieglin, B. and Sigalov, A. and Silva, A. and Silva, C. and Simon, P. and Simpson, J. and Snicker, A. and Sommariva, C. and Sozzi, C. and Spolaore, M. and Stejner, M. and Stober, J. and Stobbe, F. and Stroth, U. and Strumberger, E. and Suarez, G. and Sugiyama, K. and Sun, H. -J. and Suttrop, W. and Szepesi, T. and Tal, B. and Tala, T. and Tardini, G. and Tardocchi, M. and Terranova, D. and Tierens, W. and Told, D. and Tudisco, O. and Trevisan, G. and Treutterer, W. and Trier, E. and Tripsky, M. and Valisa, M. and Valovic, M. and Vanovac, B. and Varela, P. and Varoutis, S. and Verdoolaege, G. and Vezinet, D. and Vianello, N. and Vicente, J. and Vierle, T. and Viezzer, E. and von Toussaint, U. and Wagner, D. and Wang, N. and Wang, X. and Weidl, M. and Weiland, M. and White, A. E. and Willensdorfer, M. and Wiringer, B. and Wischmeier, M. and Wolf, R. and Wolfrum, E. and Xiang, L. and Yang, Q. and Yang, Z. and Yu, Q. and Zagorski, R. and Zammuto, I. and Zarzoso, D. and Zhang, W. and van Zeeland, M. and Zehetbauer, T. and Zilker, M. and Zoletnik, S. and Zohm, H.},
  issn         = {0029-5515},
  journal      = {NUCLEAR FUSION},
  keyword      = {nuclear fusion,tokamak physics,ITER,DEMO},
  language     = {eng},
  number       = {10},
  pages        = {12},
  publisher    = {Iop Publishing Ltd},
  title        = {Overview of ASDEX Upgrade results},
  url          = {http://dx.doi.org/10.1088/1741-4326/aa64f6},
  volume       = {57},
  year         = {2017},
}

Chicago
Kallenbach, A., D. Aguiam, L. Aho-Mantila, C. Angioni, N. Arden, R. Arredondo Parra, O. Asunta, et al. 2017. “Overview of ASDEX Upgrade Results.” Nuclear Fusion 57 (10).
APA
Kallenbach, A., Aguiam, D., Aho-Mantila, L., Angioni, C., Arden, N., Parra, R. A., Asunta, O., et al. (2017). Overview of ASDEX Upgrade results. NUCLEAR FUSION, 57(10).
Vancouver
1.
Kallenbach A, Aguiam D, Aho-Mantila L, Angioni C, Arden N, Parra RA, et al. Overview of ASDEX Upgrade results. NUCLEAR FUSION. Bristol: Iop Publishing Ltd; 2017;57(10).
MLA
Kallenbach, A., D. Aguiam, L. Aho-Mantila, et al. “Overview of ASDEX Upgrade Results.” NUCLEAR FUSION 57.10 (2017): n. pag. Print.