Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak

Happel, T.; Griener, M.; Silvagni, D.; Freethy, S. J.; Hennequin, P.; Janky, F.; Manz, P.; Prisiazhniuk, D.; Ryter, F.; Bernert, M.; Brida, D.; Eich, T.; Faitsch, M.; Gil, L.; Guimarais, L.; Merle, A.; Nille, D.; Pinzón, J.; Sieglin, B.; Stroth, U.; Viezzer, E.

doi:10.1016/j.nme.2018.12.022

Title: Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak

Journal Article · 26 December 2018 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2018.12.022 · OSTI ID:1488868

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^[2]; Silvagni, D. ^[2];

^[3]; Hennequin, P. ^[4]; Janky, F. ^[1]; Manz, P. ^[2]; Prisiazhniuk, D. ^[2]; Ryter, F. ^[1]; Bernert, M. ^[1]; Brida, D. ^[1]; Eich, T. ^[1];

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^[5]; Guimarais, L. ^[5]; Merle, A. ^[6]; Nille, D. ^[1]; Pinzón, J. ^[2]; Sieglin, B. ^[1]; Stroth, U. ^[2] more »

Max Planck Inst. fuer Plasmaphysik, Garching (Germany)
Max Planck Inst. fuer Plasmaphysik, Garching (Germany); Technische Univ. Munchen, Garching (Germany)
Max Planck Inst. fuer Plasmaphysik, Garching (Germany); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Ecole Polytechnique, Palaiseau (France)
Univ. of Lisbon (Portugal)
Ecole Polytechinque Federale de Lausanne (EPFL) (Switzerland)
Univ. of Seville (Spain)

Recent I-mode investigations from the ASDEX Upgrade tokamak are reported. It is shown that neutral-beam-injection heated I-modes can be stationary, which is important in terms of extrapolability towards future fusion devices. Furthermore, detailed studies on the weakly coherent mode are reported. In particular, experimental observations point towards its existence in L-mode, before I-mode starts. Moreover, its impact on density and temperature fluctuations is evaluated. Studies of stationary divertor heat fluxes show that in I-mode, the upstream power fall-off length is between those observed in L-mode and H-mode, and it is connected to the scrape-off layer temperature fall-off length. Moreover, analysis of transient divertor heat loads shows that intermittent turbulent events, observed in the confinement region and linked to the weakly coherent mode, are responsible for a significant part of divertor heat loads.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Euratom research and training programme

Contributing Organization:: ASDEX Upgrade Team; EUROfusion MST1 Team

Grant/Contract Number:: SC0006419; SC0017381; 633053

OSTI ID:: 1488868

Alternate ID(s):: OSTI ID: 1610856

Journal Information:: Nuclear Materials and Energy, Vol. 18, Issue C; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 26 works

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Gyrokinetic investigation of the ASDEX Upgrade I-mode pedestal Stimmel, K.; Bañón Navarro, A.; Happel, T. Physics of Plasmas, Vol. 26, Issue 12 https://doi.org/10.1063/1.5124986	journal	December 2019
Simulations of tokamak boundary plasma turbulence transport in setting the divertor heat flux width Xu, X. Q.; Li, N. M.; Li, Z. Y. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab430d	journal	October 2019
27th IAEA Fusion Energy Conference: summary of sessions EX/C, EX/S and PPC Campbell, D. J. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5cee	journal	January 2020

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