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:
-
;
;
;
;
;
more »
- 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. 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., & 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}
}
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.nme.2018.12.022
https://doi.org/10.1016/j.nme.2018.12.022
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 6 works
Citation information provided by
Web of Science
Web of Science
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Multi-machine scaling of the divertor peak heat flux and width for L-mode and H-mode discharges
journal, March 1999
- Loarte, A.; Bosch, S.; Chankin, A.
- Journal of Nuclear Materials, Vol. 266-269
Change of the scrape-off layer power width with the toroidal B-field direction in ASDEX upgrade
journal, May 2015
- Faitsch, M.; Sieglin, B.; Eich, T.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 7
Particle transport analysis of the density build-up after the L–H transition in ASDEX Upgrade
journal, August 2013
- Willensdorfer, M.; Fable, E.; Wolfrum, E.
- Nuclear Fusion, Vol. 53, Issue 9
The physics mechanisms of the weakly coherent mode in the Alcator C-Mod Tokamak
journal, December 2016
- Liu, Z. X.; Xu, X. Q.; Gao, X.
- Physics of Plasmas, Vol. 23, Issue 12
Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV
journal, March 2018
- Faitsch, M.; Maurizio, R.; Gallo, A.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 4
Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR
journal, June 2012
- Kruezi, U.; Stoschus, H.; Schweer, B.
- Review of Scientific Instruments, Vol. 83, Issue 6
Real time capable infrared thermography for ASDEX Upgrade
journal, November 2015
- Sieglin, B.; Faitsch, M.; Herrmann, A.
- Review of Scientific Instruments, Vol. 86, Issue 11
I-mode: an H-mode energy confinement regime with L-mode particle transport in Alcator C-Mod
journal, August 2010
- Whyte, D. G.; Hubbard, A. E.; Hughes, J. W.
- Nuclear Fusion, Vol. 50, Issue 10
Turbulence intermittency linked to the weakly coherent mode in ASDEX Upgrade I-mode plasmas
journal, May 2016
- Happel, T.; Manz, P.; Ryter, F.
- Nuclear Fusion, Vol. 56, Issue 6
H-mode power threshold and transition in ASDEX Upgrade
journal, May 1998
- Ryter, F.; Suttrop, W.; Brüsehaber, B.
- Plasma Physics and Controlled Fusion, Vol. 40, Issue 5
Inter-ELM Power Decay Length for JET and ASDEX Upgrade: Measurement and Comparison with Heuristic Drift-Based Model
journal, November 2011
- Eich, T.; Sieglin, B.; Scarabosio, A.
- Physical Review Letters, Vol. 107, Issue 21
Fluctuating zonal flows in the I-mode regime in Alcator C-Mod
journal, May 2013
- Cziegler, I.; Diamond, P. H.; Fedorczak, N.
- Physics of Plasmas, Vol. 20, Issue 5
Theoretical explanation of I-mode impurity removal and energy confinement
journal, July 2018
- Espinosa, Silvia; Catto, Peter J.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 9
Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod
journal, October 2017
- Hubbard, A. E.; Baek, S. -G.; Brunner, D.
- Nuclear Fusion, Vol. 57, Issue 12
Qualification and implementation of line ratio spectroscopy on helium as plasma edge diagnostic at ASDEX Upgrade
journal, December 2017
- Griener, M.; Burgos, J. M. Muñoz; Cavedon, M.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 2
Electron temperature fluctuations associated with the weakly coherent mode in the edge of I-mode plasmas
journal, October 2011
- White, A. E.; Phillips, P.; Whyte, D. G.
- Nuclear Fusion, Vol. 51, Issue 11
Investigation of scrape-off layer and divertor heat transport in ASDEX Upgrade L-mode
journal, April 2016
- Sieglin, B.; Eich, T.; Faitsch, M.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 5
Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks
journal, December 2011
- Goldston, R. J.
- Nuclear Fusion, Vol. 52, Issue 1
ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets
journal, November 2015
- Sorbom, B. N.; Ball, J.; Palmer, T. R.
- Fusion Engineering and Design, Vol. 100
Study of near scrape-off layer (SOL) temperature and density gradient lengths with Thomson scattering
journal, November 2015
- Sun, H. J.; Wolfrum, E.; Eich, T.
- Plasma Physics and Controlled Fusion, Vol. 57, Issue 12
Heat-flux footprints for I-mode and EDA H-mode plasmas on Alcator C-Mod
journal, July 2013
- Terry, J. L.; LaBombard, B.; Brunner, D.
- Journal of Nuclear Materials, Vol. 438
ADX: a high field, high power density, advanced divertor and RF tokamak
journal, April 2015
- LaBombard, B.; Marmar, E.; Irby, J.
- Nuclear Fusion, Vol. 55, Issue 5
Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER
journal, August 2013
- Eich, T.; Leonard, A. W.; Pitts, R. A.
- Nuclear Fusion, Vol. 53, Issue 9
Chapter 1: Overview and summary
journal, December 1999
- Editors, ITER Physics Basis; Co-Chairs, ITER Physics Expert Group Chairs an; Unit, ITER Joint Central Team and Physics
- Nuclear Fusion, Vol. 39, Issue 12
Measurement of turbulent electron temperature fluctuations on the ASDEX Upgrade tokamak using correlated electron cyclotron emission
journal, July 2016
- Freethy, S. J.; Conway, G. D.; Classen, I.
- Review of Scientific Instruments, Vol. 87, Issue 11
Chapter 2: Plasma confinement and transport
journal, December 1999
- Transport, ITER Physics Expert Group on Confin; Database, ITER Physics Expert Group on Confin; Editors, ITER Physics Basis
- Nuclear Fusion, Vol. 39, Issue 12
Turbulence characteristics of the I-mode confinement regime in ASDEX Upgrade
journal, July 2017
- Manz, P.; Happel, T.; Ryter, F.
- Nuclear Fusion, Vol. 57, Issue 8
Core impurity transport in Alcator C-Mod L-, I- and H-mode plasmas
journal, February 2015
- Rice, J. E.; Reinke, M. L.; Gao, C.
- Nuclear Fusion, Vol. 55, Issue 3
Study of near SOL decay lengths in ASDEX Upgrade under attached and detached divertor conditions
journal, August 2017
- Sun, H. J.; Wolfrum, E.; Kurzan, B.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 10
Characterization of density fluctuations during the search for an I-mode regime on the DIII-D tokamak
journal, August 2015
- Marinoni, A.; Rost, J. C.; Porkolab, M.
- Nuclear Fusion, Vol. 55, Issue 9
Edge-localized mode avoidance and pedestal structure in I-mode plasmas
journal, May 2014
- Walk, J. R.; Hughes, J. W.; Hubbard, A. E.
- Physics of Plasmas, Vol. 21, Issue 5
Edge energy transport barrier and turbulence in the I-mode regime on Alcator C-Mod
journal, May 2011
- Hubbard, A. E.; Whyte, D. G.; Churchill, R. M.
- Physics of Plasmas, Vol. 18, Issue 5
Magnetic field pitch angle and perpendicular velocity measurements from multi-point time-delay estimation of poloidal correlation reflectometry
journal, January 2017
- Prisiazhniuk, D.; Krämer-Flecken, A.; Conway, G. D.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 2
Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)
journal, October 2018
- Griener, M.; Wolfrum, E.; Cavedon, M.
- Review of Scientific Instruments, Vol. 89, Issue 10
The I-mode confinement regime at ASDEX Upgrade: global properties and characterization of strongly intermittent density fluctuations
journal, October 2016
- Happel, T.; Manz, P.; Ryter, F.
- Plasma Physics and Controlled Fusion, Vol. 59, Issue 1
Edge and core Thomson scattering systems and their calibration on the ASDEX Upgrade tokamak
journal, October 2011
- Kurzan, B.; Murmann, H. D.
- Review of Scientific Instruments, Vol. 82, Issue 10
Application of AXUV diode detectors at ASDEX Upgrade
journal, March 2014
- Bernert, M.; Eich, T.; Burckhart, A.
- Review of Scientific Instruments, Vol. 85, Issue 3
Geodesic oscillations and the weakly coherent mode in the I-mode of ASDEX Upgrade
journal, June 2015
- Manz, P.; Lauber, P.; Nikolaeva, V. E.
- Nuclear Fusion, Vol. 55, Issue 8
Multi-device studies of pedestal physics and confinement in the I-mode regime
journal, July 2016
- Hubbard, A. E.; Osborne, T.; Ryter, F.
- Nuclear Fusion, Vol. 56, Issue 8
High-resolution heat flux width measurements at reactor-level magnetic fields and observation of a unified width scaling across confinement regimes in the Alcator C-Mod tokamak
journal, July 2018
- Brunner, D.; LaBombard, B.; Kuang, A. Q.
- Nuclear Fusion, Vol. 58, Issue 9
I-mode studies at ASDEX Upgrade: L-I and I-H transitions, pedestal and confinement properties
journal, October 2016
- Ryter, F.; Fischer, R.; Fuchs, J. C.
- Nuclear Fusion, Vol. 57, Issue 1
Integrated Data Analysis of Profile Diagnostics at ASDEX Upgrade
journal, October 2010
- Fischer, R.; Fuchs, C. J.; Kurzan, B.
- Fusion Science and Technology, Vol. 58, Issue 2