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Overview of physics studies on ASDEX Upgrade

(2019) NUCLEAR FUSION. 59(11).
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Abstract
The ASDEX Upgrade (AUG) programme, jointly run with the EUROfusion MST1 task force, continues to significantly enhance the physics base of ITER and DEMO. Here, the full tungsten wall is a key asset for extrapolating to future devices. The high overall heating power, flexible heating mix and comprehensive diagnostic set allows studies ranging from mimicking the scrape-off-layer and divertor conditions of ITER and DEMO at high density to fully non-inductive operation (q(95) = 5.5, beta(N) <= 2.8) at low density. Higher installed electron cyclotron resonance heating power <= 6 MW, new diagnostics and improved analysis techniques have further enhanced the capabilities of AUG. Stable high-density H-modes with P-sep/R <= 11 MW m(-1) with fully detached strike-points have been demonstrated. The ballooning instability close to the separatrix has been identified as a potential cause leading to the H-mode density limit and is also found to play an important role for the access to small edge-localized modes (ELMs). Density limit disruptions have been successfully avoided using a path-oriented approach to disruption handling and progress has been made in understanding the dissipation and avoidance of runaway electron beams. ELM suppression with resonant magnetic perturbations is now routinely achieved reaching transiently H-H98(y,H-2) <= 1.1. This gives new insight into the field penetration physics, in particular with respect to plasma flows. Modelling agrees well with plasma response measurements and a helically localised ballooning structure observed prior to the ELM is evidence for the changed edge stability due to the magnetic perturbations. The impact of 3D perturbations on heat load patterns and fast-ion losses have been further elaborated. Progress has also been made in understanding the ELM cycle itself. Here, new fast measurements of T-i and E-r allow for inter ELM transport analysis confirming that E-r is dominated by the diamagnetic term even for fast timescales. New analysis techniques allow detailed comparison of the ELM crash and are in good agreement with nonlinear MHD modelling. The observation of accelerated ions during the ELM crash can be seen as evidence for the reconnection during the ELM. As type-I ELMs (even mitigated) are likely not a viable operational regime in DEMO studies of 'natural' no ELM regimes have been extended. Stable I-modes up to n/n(GW) <= 0.7 have been characterised using beta-feedback. Core physics has been advanced by more detailed characterisation of the turbulence with new measurements such as the eddy tilt angle-measured for the first time-or the cross-phase angle of T-e and n(e) fluctuations. These new data put strong constraints on gyro-kinetic turbulence modelling. In addition, carefully executed studies in different main species (H, D and He) and with different heating mixes highlight the importance of the collisional energy exchange for interpreting energy confinement. A new regime with a hollow T-e profile now gives access to regimes mimicking aspects of burning plasma conditions and lead to nonlinear interactions of energetic particle modes despite the sub-Alfvenic beam energy. This will help to validate the fast-ion codes for predicting ITER and DEMO.
Keywords
nuclear fusion, magnetic confinement, tokamak physics, ITER, DEMO, SOLID TUNGSTEN DIVERTOR, HEAVY ALLOYS, MODE, PLASMAS, FLUX

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MLA
Meyer, H., et al. “Overview of Physics Studies on ASDEX Upgrade.” NUCLEAR FUSION, vol. 59, no. 11, 2019.
APA
Meyer, H., Aguiam, D., Angioni, C., Albert, C. G., Arden, N., Parra, R. A., … Zohm, H. (2019). Overview of physics studies on ASDEX Upgrade. NUCLEAR FUSION, 59(11).
Chicago author-date
Meyer, H., D. Aguiam, C. Angioni, C. G. Albert, N. Arden, R. Arredondo Parra, O. Asunta, et al. 2019. “Overview of Physics Studies on ASDEX Upgrade.” NUCLEAR FUSION 59 (11).
Chicago author-date (all authors)
Meyer, H., D. Aguiam, C. Angioni, C. G. Albert, N. Arden, R. Arredondo Parra, O. Asunta, M. de Baar, M. Balden, V Bandaru, K. Behler, A. Bergmann, J. Bernardo, M. Bernert, A. Biancalani, R. Bilato, G. Birkenmeier, T. C. Blanken, V Bobkov, A. Bock, T. Bolzonella, A. Bortolon, B. Boeswirth, C. Bottereau, A. Bottino, H. van den Brand, S. Brezinsek, D. Brida, F. Brochard, C. Bruhn, J. Buchanan, A. Buhler, A. Burckhart, Y. Camenen, D. Carlton, M. Carr, D. Carralero, C. Castaldo, M. Cavedon, C. Cazzaniga, S. Ceccuzzi, C. Challis, A. Chankin, S. Chapman, C. Cianfarani, F. Clairet, S. Coda, R. Coelho, J. W. Coenen, L. Colas, G. D. Conway, S. Costea, D. P. Coster, T. B. Cote, A. Creely, G. Croci, G. Cseh, A. Czarnecka, I Cziegler, O. D’Arcangelo, P. David, C. Day, R. Delogu, P. de Marne, S. S. Denk, P. Denner, M. Dibon, A. Di Siena, D. Douai, A. Drenik, R. Drube, M. Dunne, B. P. Duval, R. Dux, T. Eich, S. Elgeti, K. Engelhardt, B. Erdos, I Erofeev, B. Esposito, E. Fable, M. Faitsch, U. Fantz, H. Faugel, I Faust, F. Felici, J. Ferreira, S. Fietz, A. Figuereido, R. Fischer, O. Ford, L. Frassinetti, S. Freethy, M. Froeschle, G. Fuchert, J. C. Fuchs, H. Fuenfgelder, K. Galazka, J. Galdon-Quiroga, A. Gallo, Y. Gao, S. Garavaglia, A. Garcia-Carrasco, M. Garcia-Munoz, B. Geiger, L. Giannone, L. Gil, E. Giovannozzi, C. Gleason-Gonzalez, S. Gloeggler, M. Gobbin, T. Goerler, I. Gomez Ortiz, J. Gonzalez Martin, T. Goodman, G. Gorini, D. Gradic, A. Graeter, G. Granucci, H. Greuner, M. Griener, M. Groth, A. Gude, S. Gunter, L. Guimarais, G. Haas, A. H. Hakola, C. Ham, T. Happel, N. den Harder, G. F. Harrer, J. Harrison, V Hauer, T. Hayward-Schneider, C. C. Hegna, B. Heinemann, S. Heinzel, T. Hellsten, S. Henderson, P. Hennequin, A. Herrmann, M. F. Heyn, E. Heyn, F. Hitzler, J. Hobirk, K. Hoefler, M. Hoelzl, T. Hoeschen, J. H. Holm, C. Hopf, W. A. Hornsby, L. Horvath, A. Houben, A. Huber, V Igochine, T. Ilkei, I. Ivanova-Stanik, W. Jacob, A. S. Jacobsen, F. Janky, A. Jansen van Vuuren, A. Jardin, F. Jaulmes, F. Jenko, T. Jensen, E. Joffrin, C-P Kaesemann, A. Kallenbach, S. Kalvin, M. Kantor, A. Kappatou, O. Kardaun, J. Karhunen, S. Kasilov, Y. Kazakov, W. Kernbichler, A. Kirk, S. Kjer Hansen, Veronika Klevarova, G. Kocsis, A. Koehn, M. Koubiti, K. Krieger, A. Krivska, A. Kraemer-Flecken, O. Kudlacek, T. Kurki-Suonio, B. Kurzan, B. Labit, K. Lackner, F. Laggner, P. T. Lang, P. Lauber, A. Lebschy, N. Leuthold, M. Li, O. Linder, B. Lipschultz, F. Liu, Y. Liu, A. Lohs, Z. Lu, T. Luda di Cortemiglia, N. C. Luhmann, R. Lunsford, T. Lunt, A. Lyssoivan, T. Maceina, J. Madsen, R. Maggiora, H. Maier, O. Maj, J. Mailloux, R. Maingi, E. Maljaars, P. Manas, A. Mancini, A. Manhard, M-E Manso, P. Mantica, M. Mantsinen, P. Manz, M. Maraschek, C. Martens, P. Martin, L. Marrelli, A. Martitsch, M. Mayer, D. Mazon, P. J. McCarthy, R. McDermott, H. Meister, A. Medvedeva, R. Merkel, A. Merle, V Mertens, D. Meshcheriakov, O. Meyer, J. Miettunen, D. Milanesio, F. Mink, A. Mlynek, F. Monaco, C. Moon, F. Nabais, A. Nemes-Czopf, G. Neu, R. Neu, A. H. Nielsen, S. K. Nielsen, V Nikolaeva, M. Nocente, Jean-Marie Noterdaeme, I Novikau, S. Nowak, M. Oberkofler, M. Oberparleiter, R. Ochoukov, T. Odstrcil, J. Olsen, F. Orain, F. Palermo, O. Pan, G. Papp, I. Paradela Perez, A. Pau, G. Pautasso, F. Penzel, P. Petersson, J. Pinzon Acosta, P. Piovesan, C. Piron, R. Pitts, U. Plank, B. Plaum, B. Ploeckl, V Plyusnin, G. Pokol, E. Poli, L. Porte, S. Potzel, D. Prisiazhniuk, T. Puetterich, M. Ramisch, J. Rasmussen, G. A. Ratt, S. Ratynskaia, G. Raupp, G. L. Ravera, D. Rfy, M. Reich, F. Reimold, D. Reiser, T. Ribeiro, J. Riesch, R. Riedl, D. Rittich, J. F. Rivero-Rodriguez, G. Rocchi, M. Rodriguez-Ramos, V Rohde, A. Ross, M. Rott, M. Rubel, D. Ryan, F. Ryter, S. Saarelma, M. Salewski, A. Salmi, L. Sanchis-Sanchez, J. Santos, O. Sauter, A. Scarabosio, G. Schall, K. Schmid, O. Schmitz, P. A. Schneider, R. Schrittwieser, M. Schubert, T. Schwarz-Selinger, J. Schweinzer, B. Scott, T. Sehmer, E. Seliunin, M. Sertoli, Aqsa Shabbir, A. Shalpegin, L. Shao, S. Sharapov, G. Sias, M. Siccinio, B. Sieglin, A. Sigalov, A. Silva, C. Silva, D. Silvagni, P. Simon, J. Simpson, E. Smigelskis, A. Snicker, C. Sommariva, C. Sozzi, M. Spolaore, A. Stegmeir, M. Stejner, J. Stober, U. Stroth, E. Strumberger, G. Suarez, H-J Sun, W. Suttrop, E. Sytova, T. Szepesi, B. Tal, T. Tala, G. Tardini, M. Tardocchi, M. Teschke, D. Terranova, W. Tierens, E. Thoren, D. Told, P. Tolias, O. Tudisco, W. Treutterer, E. Trier, M. Tripsky, M. Valisa, M. Valovic, B. Vanovac, D. van Vugt, S. Varoutis, Geert Verdoolaege, N. Vianello, J. Vicente, T. Vierle, E. Viezzer, U. von Toussaint, D. Wagner, N. Wang, X. Wang, M. Weiland, A. E. White, S. Wiesen, M. Willensdorfer, B. Wiringer, M. Wischmeier, R. Wolf, E. Wolfrum, L. Xiang, Q. Yang, Z. Yang, Q. Yu, R. Zagorski, I Zammuto, Weixi Zhang, M. van Zeeland, T. Zehetbauer, M. Zilker, S. Zoletnik, and H. Zohm. 2019. “Overview of Physics Studies on ASDEX Upgrade.” NUCLEAR FUSION 59 (11).
Vancouver
1.
Meyer H, Aguiam D, Angioni C, Albert CG, Arden N, Parra RA, et al. Overview of physics studies on ASDEX Upgrade. NUCLEAR FUSION. 2019;59(11).
IEEE
[1]
H. Meyer et al., “Overview of physics studies on ASDEX Upgrade,” NUCLEAR FUSION, vol. 59, no. 11, 2019.
@article{8637259,
  abstract     = {The ASDEX Upgrade (AUG) programme, jointly run with the EUROfusion MST1 task force, continues to significantly enhance the physics base of ITER and DEMO. Here, the full tungsten wall is a key asset for extrapolating to future devices. The high overall heating power, flexible heating mix and comprehensive diagnostic set allows studies ranging from mimicking the scrape-off-layer and divertor conditions of ITER and DEMO at high density to fully non-inductive operation (q(95) = 5.5, beta(N) <= 2.8) at low density. Higher installed electron cyclotron resonance heating power <= 6 MW, new diagnostics and improved analysis techniques have further enhanced the capabilities of AUG. Stable high-density H-modes with P-sep/R <= 11 MW m(-1) with fully detached strike-points have been demonstrated. The ballooning instability close to the separatrix has been identified as a potential cause leading to the H-mode density limit and is also found to play an important role for the access to small edge-localized modes (ELMs). Density limit disruptions have been successfully avoided using a path-oriented approach to disruption handling and progress has been made in understanding the dissipation and avoidance of runaway electron beams. ELM suppression with resonant magnetic perturbations is now routinely achieved reaching transiently H-H98(y,H-2) <= 1.1. This gives new insight into the field penetration physics, in particular with respect to plasma flows. Modelling agrees well with plasma response measurements and a helically localised ballooning structure observed prior to the ELM is evidence for the changed edge stability due to the magnetic perturbations. The impact of 3D perturbations on heat load patterns and fast-ion losses have been further elaborated. Progress has also been made in understanding the ELM cycle itself. Here, new fast measurements of T-i and E-r allow for inter ELM transport analysis confirming that E-r is dominated by the diamagnetic term even for fast timescales. New analysis techniques allow detailed comparison of the ELM crash and are in good agreement with nonlinear MHD modelling. The observation of accelerated ions during the ELM crash can be seen as evidence for the reconnection during the ELM. As type-I ELMs (even mitigated) are likely not a viable operational regime in DEMO studies of 'natural' no ELM regimes have been extended. Stable I-modes up to n/n(GW) <= 0.7 have been characterised using beta-feedback. Core physics has been advanced by more detailed characterisation of the turbulence with new measurements such as the eddy tilt angle-measured for the first time-or the cross-phase angle of T-e and n(e) fluctuations. These new data put strong constraints on gyro-kinetic turbulence modelling. In addition, carefully executed studies in different main species (H, D and He) and with different heating mixes highlight the importance of the collisional energy exchange for interpreting energy confinement. A new regime with a hollow T-e profile now gives access to regimes mimicking aspects of burning plasma conditions and lead to nonlinear interactions of energetic particle modes despite the sub-Alfvenic beam energy. This will help to validate the fast-ion codes for predicting ITER and DEMO.},
  articleno    = {112014},
  author       = {Meyer, H. and Aguiam, D. and Angioni, C. and Albert, C. G. and Arden, N. and Parra, R. Arredondo and Asunta, O. and de Baar, M. and Balden, M. and Bandaru, V and Behler, K. and Bergmann, A. and Bernardo, J. and Bernert, M. and Biancalani, A. and Bilato, R. and Birkenmeier, G. and Blanken, T. C. and Bobkov, V and Bock, A. and Bolzonella, T. and Bortolon, A. and Boeswirth, 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 Camenen, Y. and Carlton, D. and Carr, M. and Carralero, D. and Castaldo, C. and Cavedon, M. and Cazzaniga, C. and Ceccuzzi, S. and Challis, C. and Chankin, A. and Chapman, S. and Cianfarani, C. and Clairet, F. and Coda, S. and Coelho, R. and Coenen, J. W. and Colas, L. and Conway, G. D. and Costea, S. and Coster, D. P. and Cote, T. B. and Creely, A. and Croci, G. and Cseh, G. and Czarnecka, A. and Cziegler, I and D'Arcangelo, O. and David, P. and Day, C. and Delogu, R. and de Marne, P. and Denk, S. S. and Denner, P. and Dibon, M. 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 Faust, I and Felici, F. and Ferreira, J. and Fietz, S. and Figuereido, A. and Fischer, R. and Ford, O. and Frassinetti, L. and Freethy, S. and Froeschle, M. and Fuchert, G. and Fuchs, J. C. and Fuenfgelder, H. and Galazka, K. and Galdon-Quiroga, J. and Gallo, A. and Gao, Y. and Garavaglia, S. and Garcia-Carrasco, A. and Garcia-Munoz, M. and Geiger, B. and Giannone, L. and Gil, L. and Giovannozzi, E. and Gleason-Gonzalez, C. and Gloeggler, S. and Gobbin, M. and Goerler, T. and Ortiz, I. Gomez and Gonzalez Martin, J. and Goodman, T. and Gorini, G. and Gradic, D. and Graeter, 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 den Harder, N. and Harrer, G. F. and Harrison, J. and Hauer, V and Hayward-Schneider, T. and Hegna, C. C. and Heinemann, B. and Heinzel, S. and Hellsten, T. and Henderson, S. and Hennequin, P. and Herrmann, A. and Heyn, M. F. and Heyn, E. and Hitzler, F. and Hobirk, J. and Hoefler, K. and Hoelzl, M. and Hoeschen, T. and Holm, J. H. and Hopf, C. and Hornsby, W. A. 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 Janky, F. and van Vuuren, A. Jansen and Jardin, A. and Jaulmes, F. and Jenko, F. and Jensen, T. and Joffrin, E. and Kaesemann, C-P and Kallenbach, A. and Kalvin, S. and Kantor, M. and Kappatou, A. and Kardaun, O. and Karhunen, J. and Kasilov, S. and Kazakov, Y. and Kernbichler, W. and Kirk, A. and Hansen, S. Kjer and Klevarova, Veronika and Kocsis, G. and Koehn, A. and Koubiti, M. and Krieger, K. and Krivska, A. and Kraemer-Flecken, A. and Kudlacek, O. and Kurki-Suonio, T. and Kurzan, B. and Labit, B. and Lackner, K. and Laggner, F. and Lang, P. T. and Lauber, P. and Lebschy, A. and Leuthold, N. and Li, M. and Linder, O. and Lipschultz, B. and Liu, F. and Liu, Y. and Lohs, A. and Lu, Z. and di Cortemiglia, T. Luda and Luhmann, N. C. and Lunsford, R. and Lunt, T. and Lyssoivan, A. and Maceina, T. and Madsen, J. and Maggiora, R. and Maier, H. and Maj, O. and Mailloux, J. and Maingi, R. 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 Mayer, M. and Mazon, D. and McCarthy, P. J. and McDermott, R. and Meister, H. and Medvedeva, A. and Merkel, R. and Merle, A. and Mertens, V and Meshcheriakov, D. and Meyer, O. and Miettunen, J. and Milanesio, D. and Mink, F. and Mlynek, A. and Monaco, F. and Moon, C. and Nabais, F. 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 Novikau, I 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 Pan, O. and Papp, G. and Perez, I. Paradela and Pau, A. and Pautasso, G. and Penzel, F. and Petersson, P. and Acosta, J. Pinzon and Piovesan, P. and Piron, C. and Pitts, R. and Plank, U. and Plaum, B. and Ploeckl, B. and Plyusnin, V and Pokol, G. and Poli, E. and Porte, L. and Potzel, S. and Prisiazhniuk, D. and Puetterich, T. and Ramisch, M. and Rasmussen, J. and Ratt, G. A. and Ratynskaia, S. and Raupp, G. and Ravera, G. L. and Rfy, D. and Reich, M. and Reimold, F. and Reiser, D. and Ribeiro, T. and Riesch, J. and Riedl, R. and Rittich, D. and Rivero-Rodriguez, J. F. 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, J. and Sauter, O. and Scarabosio, A. and Schall, G. and Schmid, K. and Schmitz, O. and Schneider, P. A. and Schrittwieser, R. and Schubert, M. and Schwarz-Selinger, T. and Schweinzer, J. and Scott, B. and Sehmer, T. and Seliunin, E. and Sertoli, M. and Shabbir, Aqsa and Shalpegin, A. and Shao, L. and Sharapov, S. and Sias, G. and Siccinio, M. and Sieglin, B. and Sigalov, A. and Silva, A. and Silva, C. and Silvagni, D. and Simon, P. and Simpson, J. and Smigelskis, E. and Snicker, A. and Sommariva, C. and Sozzi, C. and Spolaore, M. and Stegmeir, A. and Stejner, M. and Stober, J. and Stroth, U. and Strumberger, E. and Suarez, G. and Sun, H-J and Suttrop, W. and Sytova, E. and Szepesi, T. and Tal, B. and Tala, T. and Tardini, G. and Tardocchi, M. and Teschke, M. and Terranova, D. and Tierens, W. and Thoren, E. and Told, D. and Tolias, P. and Tudisco, O. and Treutterer, W. and Trier, E. and Tripsky, M. and Valisa, M. and Valovic, M. and Vanovac, B. and van Vugt, D. and Varoutis, S. and Verdoolaege, Geert 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 Weiland, M. and White, A. E. and Wiesen, S. 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 Zhang, Weixi and van Zeeland, M. and Zehetbauer, T. and Zilker, M. and Zoletnik, S. and Zohm, H.},
  issn         = {0029-5515},
  journal      = {NUCLEAR FUSION},
  keywords     = {nuclear fusion,magnetic confinement,tokamak physics,ITER,DEMO,SOLID TUNGSTEN DIVERTOR,HEAVY ALLOYS,MODE,PLASMAS,FLUX},
  language     = {eng},
  number       = {11},
  pages        = {21},
  title        = {Overview of physics studies on ASDEX Upgrade},
  url          = {http://dx.doi.org/10.1088/1741-4326/ab18b8},
  volume       = {59},
  year         = {2019},
}

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