Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade
Abstract
The dynamic behaviour of the ion and electron energy, particle and momentum transport measured during type-I edge localized mode (ELM) cycles at ASDEX Upgrade is presented. Fast measurements of the ion and electron temperature profiles revelead that the ion and electron energy transport recover on different timescales, with the electrons recovering on a slower timescale. The dominant mechanism for the additional energy transport in the electron channel that could cause the delay in the electron temperature gradient ($${\rm{\nabla }}{T}_{e}$$) recovery is attributed to the depletion of energy caused by the ELM. The local sources and sinks for the electron channel in the steep gradient region are much smaller compared to the energy flux arriving from the pedestal top, indicating that the core plasma may dictate the local dynamics of the $${\rm{\nabla }}{T}_{e}$$ recovery during the ELM cycle. A model for the edge momentum transport based on toroidal torque balance that takes into account the existence of poloidal impurity asymmetries has been developed. The analysis of the profile evolution during the ELM cycle shows that the model captures the dynamics of the rotation both before the ELM crash and during the recovery phase.
- Authors:
-
[1];
;
[1];
[3];
[4];
[2];
[2];
[2]
- Univ. of Seville (Spain)
- Max Planck Inst. for Plasma Physics, Garching (Germany)
- Technische Univ., Wien - ÖAW, Vienna (Austria). Inst. of Applied Physics
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; EUROfusion Consortium; H2020 Marie-Sklodowska Curie Programme; European Research Council (ERC)
- Contributing Org.:
- The ASDEX Upgrade Team
- OSTI Identifier:
- 1598047
- Grant/Contract Number:
- AC02-09CH11466; 633053; 708257; 805162
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 2; Conference: 46.EPS Conference on Plasma Physics, Milan (Italy), 8-12 Jul 2019; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic confinement fusion; plasma transport; magnetohydrodynamics
Citation Formats
Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., and Willensdorfer, M. Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade. United States: N. p., 2020.
Web. doi:10.1088/1361-6587/ab5b1d.
Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., & Willensdorfer, M. Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade. United States. doi:10.1088/1361-6587/ab5b1d.
Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., and Willensdorfer, M. Tue .
"Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade". United States. doi:10.1088/1361-6587/ab5b1d. https://www.osti.gov/servlets/purl/1598047.
@article{osti_1598047,
title = {Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade},
author = {Viezzer, E. and Cavedon, M. and Cano-Megias, P. and Fable, E. and Wolfrum, E. and Cruz-Zabala, D. J. and David, P. and Dux, R. and Fischer, R. and Harrer, G. F. and Laggner, F. M. and McDermott, R. M. and Plank, U. and Pütterich, T. and Willensdorfer, M.},
abstractNote = {The dynamic behaviour of the ion and electron energy, particle and momentum transport measured during type-I edge localized mode (ELM) cycles at ASDEX Upgrade is presented. Fast measurements of the ion and electron temperature profiles revelead that the ion and electron energy transport recover on different timescales, with the electrons recovering on a slower timescale. The dominant mechanism for the additional energy transport in the electron channel that could cause the delay in the electron temperature gradient (${\rm{\nabla }}{T}_{e}$) recovery is attributed to the depletion of energy caused by the ELM. The local sources and sinks for the electron channel in the steep gradient region are much smaller compared to the energy flux arriving from the pedestal top, indicating that the core plasma may dictate the local dynamics of the ${\rm{\nabla }}{T}_{e}$ recovery during the ELM cycle. A model for the edge momentum transport based on toroidal torque balance that takes into account the existence of poloidal impurity asymmetries has been developed. The analysis of the profile evolution during the ELM cycle shows that the model captures the dynamics of the rotation both before the ELM crash and during the recovery phase.},
doi = {10.1088/1361-6587/ab5b1d},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 62,
place = {United States},
year = {2020},
month = {1}
}
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