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Overview of ASDEX Upgrade results

U. Stroth 1 J. Adamek 2 L. Aho-Mantila 3 S. Akaslompolo 3 C. Amdor 4 C. Angioni 1 M. Balden 1 S. Bardin 5 L. Barrera Orte 1 K. Behler 1 E. Belonohy 1 A. Bergmann 1 M. Bernert 1 Roberto Bilato 1 G. Birkenmeier 1 V. Bobkov 1 J. Boom 6, 7 C. Bottereau 8, 9 A. Bottino 10 F. Braun 10 S. Brezinsek 11 Thierry Brochard 12 M. Brüdgam 10 A. Buhler 10 A. Burckhart 10 F. J. Casson 10 A. Chankin 10 I. Chapman 13 Frédéric Clairet 8, 9 I. G. J. Classen 6, 7 J. W. Coenen 11 G. D. Conway 10 D. P. Coster 10 D. Curran 14 F. Da Silva 4 P. de Marné 10 R. d'Inca 10 D. Douai 9 R. Drube 10 M. Dunne 14 R. Dux 10 T. Eich 10 H. Eixenberger 10 N. Endstrasser 10 K. Engelhardt 10 B. Esposito 15 E. Fable 10 R. Fischer 10 H. Fünfgelder 10 J. C. Fuchs 10 K. Gál 10 M. García Muñoz 10 B. Geiger 10 L. Giannone 10 T. Görler 10 S. Da Graca 4 H. Greuner 10 O. Gruber 10 A. Gude 10 L. Guimarais 4 S. Günter 10 G. Haas 10 A. H. Hakola 3 D. Hangan 10 T. Happel 10 T. Härtl 10 T. Hauff 10 B. Heinemann 10 A. Herrmann 10 J. Hobirk 10 H. Höhnle 16 Matthias Hölzl 10 C. Hopf 10 A. Houben 10 V. Igochine 10 C. Ionita 1 A. Janzer 10 F. Jenko 10 M. Kantor 10 C.-P. Käsemann 10 A. Kallenbach 10 S. Kálvin 17 M. Kantor 11 A. Kappatou 6, 7 O. Kardaun 10 W. Kasparek 16 M. Kaufmann 10 A. Kirk 13 H.-J. Klingshirn 10 M. Kocan 10 G. Kocsis 17 C. Konz 10 R. Koslowski 11 K. Krieger 10 M. Kubic 9 T. Kurki-Suonio 3 B. Kurzan 10 K. Lackner 10 P. T. Lang 10 P. Lauber 10 M. Laux 10 A. Lazaros 18 F. Leipold 19 F. Leuterer 10 S. Lindig 10 S. Lisgo 9 A. Lohs 10 T. Lunt 10 H. Maier 10 T. Makkonen 10 K. Mank 10 M.-E. Manso 15 M. Maraschek 10 M. Mayer 10 P. J. McCarthy 14 R. McDermott 10 F. Mehlmann 1 H. Meister 10 L. Menchero 10 F. Meo 19 P. Merkel 10 R. Merkel 10 V. Mertens 10 F. Merz 10 A. Mlynek 10 F. Monaco 10 S. Müller 20 H. W. Müller 10 M. Münich 10 G. Neu 10 R. Neu 10 D. Neuwirth 10 M. Nocente 21 B. Nold 16 J.-M. Noterdaeme 10 G. Pautasso 10 G. Pereverzev 10 B. Plöckl 10 Y. Podoba 10 F. Pompon 10 E. Poli 10 K. Polozhiy 10 S. Potzel 10 M. J. Püschel 10 T. Pütterich 10 S. K. Rathgeber 10 G. Raupp 10 M. Reich 10 F. Reimold 10 T. Ribeiro 10 R. Riedl 10 V. Rohde 10 G. V. Rooij 6, 7 J. Roth 10 M. Rott 10 F. Ryter 10 M. Salewski 19 J. Santos 4 P. Sauter 10 A. Scarabosio 10 G. Schall 10 K. Schmid 10 P. A. Schneider 10 W. Schneider 10 R. Schrittwieser 1 M. Schubert 10 J. Schweinzer 10 B. Scott 10 M. Sempf 10 M. Sertoli 10 M. Siccinio 10 B. Sieglin 10 A. Sigalov 10 A. Silva 4 F. Sommer 10 A. Stäbler 10 J. Stober 10 B. Streibl 10 E. Strumberger 10 K. Sugiyama 10 W. Suttrop 10 T. Tala 3 G. Tardini 10 M. Teschke 10 C. Tichmann 10 D. Told 10 W. Treutterer 10 M. Tsalas 6, 7 M. A. van Zeeland 22 P. Varela 4 G. Veres 17 J. Vicente 4 N. Vianello 23 T. Vierle 10 E. Viezzer 10 B. Viola 23 C. Vorpahl 10 M. Wachowski 24 D. Wagner 10 T. Wauters 9 A. Weller 10 R. Wenninger 10 B. Wieland 10 M. Willensdorfer 1 M. Wischmeier 10 E. Wolfrum 10 E. Würsching 10 Q. Yu 10 I. Zammuto 10 D. Zasche 10 T. Zehetbauer 10 Y. Zhang 10 M. Zilker 10 H. Zohm 10 
Abstract : The medium size divertor tokamak ASDEX Upgrade (major and minor radii 1.65 m and 0.5 m, respectively, magnetic-field strength 2.5 T) possesses flexible shaping and versatile heating and current drive systems. Recently the technical capabilities were extended by increasing the electron cyclotron resonance heating (ECRH) power, by installing 2 x 8 internal magnetic perturbation coils, and by improving the ion cyclotron range of frequency compatibility with the tungsten wall. With the perturbation coils, reliable suppression of large type-I edge localized modes (ELMs) could be demonstrated in a wide operational window, which opens up above a critical plasma pedestal density. The pellet fuelling efficiency was observed to increase which gives access to H-mode discharges with peaked density profiles at line densities clearly exceeding the empirical Greenwald limit. Owing to the increased ECRH power of 4 MW, H-mode discharges could be studied in regimes with dominant electron heating and low plasma rotation velocities, i.e. under conditions particularly relevant for ITER. The ion-pressure gradient and the neoclassical radial electric field emerge as key parameters for the transition. Using the total simultaneously available heating power of 23 MW, high performance discharges have been carried out where feed-back controlled radiative cooling in the core and the divertor allowed the divertor peak power loads to be maintained below 5 MW m(-2). Under attached divertor conditions, a multi-device scaling expression for the power-decay length was obtained which is independent of major radius and decreases with magnetic field resulting in a decay length of 1 mm for ITER. At higher densities and under partially detached conditions, however, a broadening of the decay length is observed. In discharges with density ramps up to the density limit, the divertor plasma shows a complex behaviour with a localized high-density region in the inner divertor before the outer divertor detaches. Turbulent transport is studied in the core and the scrape-off layer (SOL). Discharges over a wide parameter range exhibit a close link between core momentum and density transport. Consistent with gyro-kinetic calculations, the density gradient at half plasma radius determines the momentum transport through residual stress and thus the central toroidal rotation. In the SOL a close comparison of probe data with a gyro-fluid code showed excellent agreement and points to the dominance of drift waves. Intermittent structures from ELMs and from turbulence are shown to have high ion temperatures even at large distances outside the separatrix.
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U. Stroth, J. Adamek, L. Aho-Mantila, S. Akaslompolo, C. Amdor, et al.. Overview of ASDEX Upgrade results. Nuclear Fusion, 2013, 53 (10, SI), pp.104003. ⟨10.1088/0029-5515/53/10/104003⟩. ⟨hal-01284943⟩

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