Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak
Abstract
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.
- Authors:
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- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Euratom research and training programme
- Contributing Org.:
- ASDEX Upgrade Team; EUROfusion MST1 Team
- OSTI Identifier:
- 1488868
- Alternate Identifier(s):
- OSTI ID: 1610856
- Grant/Contract Number:
- SC0006419; SC0017381; 633053
- Resource Type:
- Published Article
- Journal Name:
- Nuclear Materials and Energy
- Additional Journal Information:
- Journal Name: Nuclear Materials and Energy Journal Volume: 18 Journal Issue: C; Journal ID: ISSN 2352-1791
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear Science & Technology
Citation Formats
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., and Viezzer, E. Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak. Netherlands: N. p., 2019.
Web. doi:10.1016/j.nme.2018.12.022.
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. Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak. Netherlands. https://doi.org/10.1016/j.nme.2018.12.022
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., and Viezzer, E. Tue .
"Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak". Netherlands. https://doi.org/10.1016/j.nme.2018.12.022.
@article{osti_1488868,
title = {Stationarity of I-mode operation and I-mode divertor heat fluxes on the ASDEX Upgrade tokamak},
author = {Happel, T. and Griener, M. and Silvagni, D. and Freethy, S. J. and Hennequin, P. and Janky, F. and Manz, P. and Prisiazhniuk, D. and Ryter, F. and Bernert, M. and Brida, D. and Eich, T. and Faitsch, M. and Gil, L. and Guimarais, L. and Merle, A. and Nille, D. and Pinzón, J. and Sieglin, B. and Stroth, U. and Viezzer, E.},
abstractNote = {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.},
doi = {10.1016/j.nme.2018.12.022},
journal = {Nuclear Materials and Energy},
number = C,
volume = 18,
place = {Netherlands},
year = {2019},
month = {1}
}
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https://doi.org/10.1016/j.nme.2018.12.022
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