EDGE2D-EIRENE modelling of near SOL Er: possible impact on the H-mode power threshold
Abstract
Recent EDGE2D-EIRENE simulations of JET plasmas showed a significant difference between radial electric field (Er) profiles across the separatrix in two divertor configurations, with the outer strike point on the horizontal target (HT) and vertical target (VT) (Chankin et al 2016 Nucl. Mater. Energy, doi: 10.1016/j.nme.2016.10.004). Under conditions (input power, plasma density) where the HT plasma went into the H-mode, a large positive Er spike in the near scrape-off layer (SOL) was seen in the code output, leading to a very large E × B shear across the separatrix over a narrow region of a fraction of a cm width. No such Er feature was obtained in the code solution for the VT configuration, where the H-mode power threshold was found to be twice as high as in the HT configuration. It was hypothesised that the large E × B shear across the separatrix in the HT configuration could be responsible for the turbulence suppression leading to an earlier (at lower input power) L–H transition compared to the VT configuration. In the present work these ideas are extended to cover some other experimental observations on the H-mode power threshold variation with parameters which typically are not included in the multi-machinemore »
- Authors:
-
[2];
- Max Planck Institute for Plasma Physics, Garching bei Munchen (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- EUROfusion Consortium, JET, Culham Science Centre, Abingdon (United Kingdom)
- OSTI Identifier:
- 1822099
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 4; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Chankin, A. V., Delabie, E., Corrigan, G., Harting, D., Maggi, C. F., and Meyer, H. EDGE2D-EIRENE modelling of near SOL Er: possible impact on the H-mode power threshold. United States: N. p., 2017.
Web. doi:10.1088/1361-6587/aa5ecc.
Chankin, A. V., Delabie, E., Corrigan, G., Harting, D., Maggi, C. F., & Meyer, H. EDGE2D-EIRENE modelling of near SOL Er: possible impact on the H-mode power threshold. United States. https://doi.org/10.1088/1361-6587/aa5ecc
Chankin, A. V., Delabie, E., Corrigan, G., Harting, D., Maggi, C. F., and Meyer, H. Thu .
"EDGE2D-EIRENE modelling of near SOL Er: possible impact on the H-mode power threshold". United States. https://doi.org/10.1088/1361-6587/aa5ecc. https://www.osti.gov/servlets/purl/1822099.
@article{osti_1822099,
title = {EDGE2D-EIRENE modelling of near SOL Er: possible impact on the H-mode power threshold},
author = {Chankin, A. V. and Delabie, E. and Corrigan, G. and Harting, D. and Maggi, C. F. and Meyer, H.},
abstractNote = {Recent EDGE2D-EIRENE simulations of JET plasmas showed a significant difference between radial electric field (Er) profiles across the separatrix in two divertor configurations, with the outer strike point on the horizontal target (HT) and vertical target (VT) (Chankin et al 2016 Nucl. Mater. Energy, doi: 10.1016/j.nme.2016.10.004). Under conditions (input power, plasma density) where the HT plasma went into the H-mode, a large positive Er spike in the near scrape-off layer (SOL) was seen in the code output, leading to a very large E × B shear across the separatrix over a narrow region of a fraction of a cm width. No such Er feature was obtained in the code solution for the VT configuration, where the H-mode power threshold was found to be twice as high as in the HT configuration. It was hypothesised that the large E × B shear across the separatrix in the HT configuration could be responsible for the turbulence suppression leading to an earlier (at lower input power) L–H transition compared to the VT configuration. In the present work these ideas are extended to cover some other experimental observations on the H-mode power threshold variation with parameters which typically are not included in the multi-machine H-mode power threshold scalings, namely: ion mass dependence (isotope H–D–T exchange), dependence on the ion ∇B drift direction, and dependence on the wall material composition (ITER-like wall versus carbon wall in JET). In all these cases EDGE2D-EIRENE modelling shows larger positive Er spikes in the near SOL under conditions where the H-mode power threshold is lower, at least in the HT configuration.},
doi = {10.1088/1361-6587/aa5ecc},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 59,
place = {United States},
year = {Thu Mar 09 00:00:00 EST 2017},
month = {Thu Mar 09 00:00:00 EST 2017}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
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:
Characterization of the H-mode edge barrier at ASDEX Upgrade
journal, July 2005
- Horton, L. D.; Chankin, A. V.; Chen, Y. P.
- Nuclear Fusion, Vol. 45, Issue 8
Classical drifts in the tokamak SOL and divertor: models and experiment
journal, February 1997
- Chankin, A. V.
- Journal of Nuclear Materials, Vol. 241-243
Effects of divertor geometry on tokamak plasmas
journal, May 2001
- Loarte, Alberto
- Plasma Physics and Controlled Fusion, Vol. 43, Issue 6
L–H transition studies on DIII-D to determine H-mode access for operational scenarios in ITER
journal, August 2011
- Gohil, P.; Evans, T. E.; Fenstermacher, M. E.
- Nuclear Fusion, Vol. 51, Issue 10
On the role of the edge density profile for the L–H transition power threshold in ASDEX Upgrade
journal, January 2016
- Shao, L. M.; Wolfrum, E.; Ryter, F.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 2
Possible influence of near SOL plasma on the H-mode power threshold
journal, August 2017
- Chankina, A. V.; Delabie, E.; Corrigan, G.
- Nuclear Materials and Energy, Vol. 12
H-mode operational boundaries
journal, May 2000
- Horton, L. D.
- Plasma Physics and Controlled Fusion, Vol. 42, Issue 5A
JET divertor geometry and plasma shape effects on the L–H transition threshold
journal, April 2004
- Andrew, Y.; Hawkes, N. C.; O'Mullane, M. G.
- Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A
H-mode power threshold reduction in a slot-divertor configuration on the Alcator C-Mod tokamak
journal, June 2012
- Ma, Y.; Hughes, J. W.; Hubbard, A. E.
- Plasma Physics and Controlled Fusion, Vol. 54, Issue 8
Neoclassical transport effects and the H-mode transition
journal, October 1985
- Hinton, F. L.
- Nuclear Fusion, Vol. 25, Issue 10
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
journal, May 1997
- Burrell, K. H.
- Physics of Plasmas, Vol. 4, Issue 5
Spontaneous rotation sources in a quiescent tokamak edge plasma
journal, June 2008
- Chang, C. S.; Ku, S.
- Physics of Plasmas, Vol. 15, Issue 6
Effect of divertor geometry on boundary and core plasma performance in ASDEX Upgrade and JET
journal, January 1999
- Bosch, H-S; Fuchs, J. C.; Gafert, J.
- Plasma Physics and Controlled Fusion, Vol. 41, Issue 3A
L–H power threshold studies in JET with Be/W and C wall
journal, January 2014
- Maggi, C. F.; Delabie, E.; Biewer, T. M.
- Nuclear Fusion, Vol. 54, Issue 2
Isotope scaling of the H mode power threshold on JET
journal, March 1999
- Righi, E.; Bartlett, D. V.; Christiansen, J. P.
- Nuclear Fusion, Vol. 39, Issue 3
Thermal ion orbit loss and radial electric field in DIII-D
journal, August 2015
- deGrassie, J. S.; Boedo, J. A.; Grierson, B. A.
- Physics of Plasmas, Vol. 22, Issue 8
Collisional transport near the separatrix of a tokamak and the H-mode
journal, March 1989
- Hinton, F. L.; Staebler, G. M.
- Nuclear Fusion, Vol. 29, Issue 3
L–H transition and pedestal studies on MAST
journal, October 2011
- Meyer, H.; De Bock, M. F. M.; Conway, N. J.
- Nuclear Fusion, Vol. 51, Issue 11
Works referencing / citing this record:
A reduced model of neutral-plasma interactions in the edge and scrape-off-layer: Verification comparisons with kinetic Monte Carlo simulations
journal, February 2019
- Russell, D. A.; Myra, J. R.; Stotler, D. P.
- Physics of Plasmas, Vol. 26, Issue 2
Dynamics of neon ions after neon gas seeding into tokamak plasma
journal, September 2019
- Bisai, N.; Chowdhuri, M. B.; Banerjee, S.
- Nuclear Fusion, Vol. 59, Issue 12
EDGE2D-EIRENE simulations of the influence of isotope effects and anomalous transport coefficients on near scrape-off layer radial electric field
journal, May 2019
- Chankin, A. V.; Corrigan, G.; Maggi, C. F.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 7
EDGE2D-EIRENE simulations of the influence of isotope effects and anomalous transport coefficients on near scrape-off layer radial electric field
text, January 2019
- Chankin, A.; Corrigan, G.; Maggi, C. F.
- IOP Publishing