Stationary zonal flows during the formation of the edge transport barrier in the JET tokamak
Abstract
In this study, high spatial resolution Doppler backscattering measurements in JET have enabled new insights into the development of the edge Er. We observe fine-scale spatial structures in the edge Er well with a wave number krρi ≈ 0.4-0.8, consistent with stationary zonal flows, the characteristics of which vary with density. The zonal flow amplitude and wavelength both decrease with local collisionality, such that the zonal flow E x B shear increases. Above the minimum of the L-H transition power threshold dependence on density, the zonal flows are present during L mode and disappear following the H-mode transition, while below the minimum they are reduced below measurable amplitude during L mode, before the L-H transition.
- Authors:
-
- CCFE, Culham Science Centre, Oxon (United Kingdom)
- Univ. de Lisboa, Lisboa (Portugal)
- Max-Planck-Institut fur Plasmaphysik, Garching (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1263871
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 6; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Hillesheim, J. C., Meyer, H., Maggi, C. F., Meneses, L., Poli, E., and Delabie, E. Stationary zonal flows during the formation of the edge transport barrier in the JET tokamak. United States: N. p., 2016.
Web. doi:10.1103/PhysRevLett.116.065002.
Hillesheim, J. C., Meyer, H., Maggi, C. F., Meneses, L., Poli, E., & Delabie, E. Stationary zonal flows during the formation of the edge transport barrier in the JET tokamak. United States. https://doi.org/10.1103/PhysRevLett.116.065002
Hillesheim, J. C., Meyer, H., Maggi, C. F., Meneses, L., Poli, E., and Delabie, E. Wed .
"Stationary zonal flows during the formation of the edge transport barrier in the JET tokamak". United States. https://doi.org/10.1103/PhysRevLett.116.065002. https://www.osti.gov/servlets/purl/1263871.
@article{osti_1263871,
title = {Stationary zonal flows during the formation of the edge transport barrier in the JET tokamak},
author = {Hillesheim, J. C. and Meyer, H. and Maggi, C. F. and Meneses, L. and Poli, E. and Delabie, E.},
abstractNote = {In this study, high spatial resolution Doppler backscattering measurements in JET have enabled new insights into the development of the edge Er. We observe fine-scale spatial structures in the edge Er well with a wave number krρi ≈ 0.4-0.8, consistent with stationary zonal flows, the characteristics of which vary with density. The zonal flow amplitude and wavelength both decrease with local collisionality, such that the zonal flow E x B shear increases. Above the minimum of the L-H transition power threshold dependence on density, the zonal flows are present during L mode and disappear following the H-mode transition, while below the minimum they are reduced below measurable amplitude during L mode, before the L-H transition.},
doi = {10.1103/PhysRevLett.116.065002},
journal = {Physical Review Letters},
number = 6,
volume = 116,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2016},
month = {Wed Feb 10 00:00:00 EST 2016}
}
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