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1. The compatibility of high confinement times and complete divertor detachment in ASDEX-Upgrade

Author

Gerhard Raupp, H. Salzmann, H. Röhr, F. Ryter, B. Streibl, F. Serra, K. Krieger, J. Roth, H. Kollotzek, Peter Lang, P. Varela, G. Schramm, W. Suttrop, A. R. Field, H. D. Murmann, M. Ulrich, G. Becker, W. Poschenrieder, K. Behler, G. Haas, Albrecht Herrmann, W. Engelhardt, Dirk Naujoks, O. Vollmer, Harald Schneider, M. Sokoll, S. Hirsch, Cs S. Pitcher, T. Kass, Sdp De Pena Hempel, Hb-B. Schilling, A. Stäbler, M. Niethammer, U. Wenzel, G. Fieg, Wp P. West, B. Kurzan, M. Troppmann, Me E. Manso, M. Alexander, B. Napiontek, B. Jüttner, E. Speth, V. Mertens, R. Merkel, O. Gehre, L. Cupido, M. Bessenrodt-Weberpals, O. Gruber, G. Lieder, H. Wedler, R. Drube, R. Dux, Hp P. Zehrfeld, U. Seidel, R. Chodura, C. Dorn, W. Treutterer, M. Schittenhelm, Kf F. Mast, Carmen García-Rosales, F. Wesner, D. Meisel, J. Gernhardt, R. Lang, H.-S. Bosch, Thomas Zehetbauer, Ch. Fuchs, K. Schonmann, G. Pautasso, G. Neu, J. Neuhauser, Hu U. Fahrbach, S. Fiedler, R. Wunderlich, M. Maraschek, J. Stober, H. Zohm, K.H. Behringer, Ralf Schneider, Patrick J. McCarthy, Kh-H. Steuer, P. Ignacz, W. Köppendörfer, K. Lackner, W. Sandmann, Hj J. DeBlank, Hu U. Feist, Wolf-Dieter Schneider, A. Kallenbach, Jm-M. Noterdaeme, R. Neu, M. Weinlich, Michael Kaufmann, W. Junker, A. Carlson, Marco Brambilla, S. Deschka, Martin Laux, A. Silva, K. Asmussen, D. P. Coster, J. Schweinzer, G. Fussmann, W. Herrmann, K. Büchl, M. Albrecht, and D. Zasche

Subjects
Materials science, Divertor, chemistry.chemical_element, Radiation, Condensed Matter Physics, Neon, Nuclear Energy and Engineering, Deuterium, chemistry, ASDEX Upgrade, Mathematics::K-Theory and Homology, Physics::Plasma Physics, Impurity, Atomic physics
Abstract

The completely detached high confinement (CDH) regime established recently in high power ASDEX-Upgrade single null divertor discharges is described. The standard CDH mode scenario with feedback controlled external deuterium and neon puffing is analysed in detail with respect to its divertor detachment and confinement properties. Impurity transport and pumping effects and the density operation windows of the CDH mode are outlined. First results with other impurity radiators (N,Ar) are given. Finally the CDH mode operation space is discussed in terms of main chamber and scrape-off layer plus divertor radiation and possible consequences for future fusion experiments are outlined.

Published
1995
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2. Edge physics and H-mode studies in ASDEX Upgrade

Author

K.H. Behringer, G. Becker, R. Neu, B. Streibl, F. Serra, H. M. Mayer, J. Roth, F. Hofmeister, M. E. Manso, G. Venus, K. Lackner, W. Sandmann, D. Jacobi, K Behler, H. P. Zehrfeld, A. Kallenbach, O. J. W. F. Kardaun, A. Eberhagen, R. Wilhelm, G. Haas, R. Wunderlich, W. Engelhardt, H. B. Schilling, M. Münich, de Pena, Harald Richter, J. Neuhauser, H U Fahrbach, M. Alexander, G. Herppich, E. Speth, R Drube, H. J. de Blank, S. D. Hempel, A. Silva, H. Hohenöcker, Neil A. Salmon, G. Lieder, O de Barbieri, R. Merkel, T. Kass, W. Köppendörfer, M. Ulrich, K. Asmussen, Dirk Naujoks, F. Leuterer, M. Schittenhelm, J. Gernhardt, V. Mertens, O. Gruber, M. Weinlich, Ralf Schneider, Patrick J. McCarthy, M. Bessenrodt-Weberpals, H. Vernickel, R. Lang, Carmen García-Rosales, K.-H. Steuer, G. Fussmann, W. Suttrop, Ch. Fuchs, S. Götsch, Bruce D. Scott, D. Zasche, K. Schonmann, F. Braun, J. Gruber, J.-H. Feist, M. Laux, M. Troppmann, H. Röhr, H. Salzmann, K. Kiemer, F. Ryter, K. Büchl, U. Schumacher, W. Feneberg, G. Schramm, M. Albrecht, W. Poschenrieder, A. Hermann, K Gunther, C. S. Pitcher, J. Schweinzer, K. F. Mast, O. Gehre, A. Stäbler, B. Kurzan, H. Schneider, N. Tsois, B. Jüttner, L. Cupido, U. Seidel, T. Richter, O. Vollmer, J.-M. Noterdaeme, C. Dorn, G. Neu, Gerhard Raupp, K. Krieger, G. Fieg, L. Lengyel, B. Heinemann, A. R. Field, D. Meisel, F. X. Söldner, A Bergmann, W Schneider, H. Zohm, Hans-Stephan Bosch, B. Napiontek, Michael Kaufmann, W. Junker, A. Carlson, Marco Brambilla, H. Kollotzek, Peter Lang, R. Chodura, W. Treutterer, P. Varela, W Herrmann, U. Wenzel, M. Kornherr, H. D. Murmann, H. Wedler, J. Engstler, F. Wesner, and G. Pautasso

Subjects
Nuclear physics, Physics, Toroid, Nuclear Energy and Engineering, ASDEX Upgrade, Physics::Plasma Physics, Sputtering, Divertor, Boundary (topology), Plasma, Edge (geometry), Condensed Matter Physics, Magnetic field
Abstract

ASDEX Upgrade is a poloidal divertor experiment very similar to ITER with respect to magnetic field properties and especially to the plasma boundary geometry. A large part of the programme on ASDEX Upgrade is therefore dedicated to investigating and optimizing reactor-relevant plasma boundary issues. This contribution is concerned with H-mode studies and edge physics in general. The L/H-power threshold, H-mode confinement, details of ELM dynamic and 'dithering' L/H-transitions will be discussed. The edge physics investigations are concerned with model calculations and validations, the characteristic 'approach' to the density limit (DL), target plate sputtering and the influence of hydrocarbons, asymmetries and drifts depending on the direction of the toroidal magnetic field, and finally first results of high-Z material experiments.

Published
1993
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