Scrape-off layer transport and filament characteristics in high-density tokamak regimes

Vianello, N.; Carralero, D.; Tsui, C. K.; Naulin, V.; Agostini, M.; Cziegler, I.; Labit, B.; Theiler, C.; Wolfrum, E.; Aguiam, D.; Allan, S.; Bernert, M.; Boedo, J.; Costea, S.; De Oliveira, H.; Fevrier, O.; Galdon-Quiroga, J.; Grenfell, G.; Hakola, A.; Ionita, C.; Isliker, H.; Karpushov, A.; Kovacic, J.; Lipschultz, B.; Maurizio, R.; McClements, K.; Militello, F.; Nielsen, A. H.; Olsen, J.; Rasmussen, J. J.; Ravensbergen, T.; Reimerdes, H.; Schneider, B.; Schrittwieser, R.; Seliunin, E.; Spolaore, M.; Verhaegh, K.; Vicente, J.; Walkden, N.; Zhang, W.

doi:10.1088/1741-4326/ab423e

Scrape-off layer transport and filament characteristics in high-density tokamak regimes

Journal Article · Wed Oct 30 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab423e· OSTI ID:1802122

^[1]; ^[2]; ^[3]; Naulin, V. ^[4]; ^[5]; ^[6]; ^[7]; ^[7]; Wolfrum, E. ^[8]; Aguiam, D. ^[9]; Allan, S. ^[10]; Bernert, M. ^[8]; ^[11]; Costea, S. ^[12]; De Oliveira, H. ^[7]; ^[7]; ^[13]; ^[5]; Hakola, A. ^[14]; ^[12] more »

Consorzio RFX, Padova (Italy); OSTI
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain); Max-Planck-Institut für Plasmaphysik, Garching (Germany)
Univ. of California, San Diego, La Jolla, CA (United States); Ecole Polytechnique Federale Lausanne (Switzerland)
Danmarks Tekniske Univ., Lyngby (Denmark)
Consorzio RFX, Padova (Italy)
Univ. of York (United Kingdom)
Ecole Polytechnique Federale Lausanne (Switzerland)
Max-Planck-Institut für Plasmaphysik, Garching (Germany)
Instituto Superior Técnico, Lisboa (Portugal)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Univ. of California, San Diego, La Jolla, CA (United States)
Univ. of Innsbruck (Austria)
University of Seville (Spain)
VTT Technical Research Centre of Finland (Finland)
Aristotle University, Thessaloniki (Greece)
Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven (Netherlands)

A detailed cross-device investigation on the role of filamentary dynamics in high-density regimes has been performed within the EUROfusion framework, comparing the ASDEX Upgrade (AUG) and TCV tokamaks. Both devices run density ramp experiments at different levels of plasma current, keeping the toroidal field or q₉₅ constant in order to disentangle the role of the parallel connection length and the current. During the scan at a constant toroidal field, in both devices the scrape-off layer (SOL) profiles tend to develop a clear SOL density shoulder at a lower edge density whenever the current is reduced. Different current behaviour is substantially reconciled in terms of the edge density normalized to the Greenwald fraction. During the scan at constant q₉₅ AUG exhibits similar behaviour, whereas in TCV no upstream profile modification signature has been observed at lower current levels. The latter behaviour has been ascribed to the lack of target density rollover. In this work, the relation between the upstream density profile modification and detachment condition has been investigated. For both devices the relation between blob size and the SOL density e-folding length is found independent of the plasma current, with the observation of a clear increase in blob size and the edge density normalized to a Greenwald fraction. ASDEX Upgrade has also explored filamentary behaviour in the H-mode. The experiments in AUG have focused on the role of neutrals, performing discharges with and without cryogenic pumps, highlighting how high neutral pressure, not only in the divertor but also at the midplane, is needed in order to develop an H-mode SOL profile shoulder in AUG.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: Austrian Academy of Sciences (KKKÖ); Euratom; Swiss National Science Foundation (SNF); USDOE Office of Science (SC)

Contributing Organization:: The ASDEX Upgrade Team; The EUROfusion MST1 Team; The TCV Team

Grant/Contract Number:: SC0010529

OSTI ID:: 1802122

Alternate ID(s):: OSTI ID: 23013467

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (55)

Simultaneous Algebraic Reconstruction Technique (SART): A superior implementation of the ART algorithm Andersen, A. Ultrasonic Imaging, Vol. 6, Issue 1 https://doi.org/10.1016/0161-7346(84)90008-7	journal	January 1984
Divertor geometry effects on detachment in TCV Pitts, R. A.; Duval, B. P.; Loarte, A. Journal of Nuclear Materials, Vol. 290-293 https://doi.org/10.1016/S0022-3115(00)00461-X	journal	March 2001
Particle and energy transport scalings in the ASDEX scrape-off layer McCormick, K.; Kyriakakis, G.; Neuhauser, J. Journal of Nuclear Materials, Vol. 196-198 https://doi.org/10.1016/S0022-3115(06)80043-7	journal	December 1992
Experimental investigation of transport phenomena in the scrape-off layer and divertor LaBombard, B. Journal of Nuclear Materials, Vol. 241-243, Issue 1 https://doi.org/10.1016/S0022-3115(96)00502-8	journal	February 1997
SOL plasma profiles under radiative and detached divertor conditions in JT-60U Asakura, N. Journal of Nuclear Materials, Vol. 241-243, Issue 1 https://doi.org/10.1016/S0022-3115(96)00564-8	journal	February 1997
Edge turbulence and SOL transport in tokamaks Boedo, J. A. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.040	journal	June 2009
Formation of the high density front in the inner far SOL at ASDEX Upgrade and JET Potzel, S.; Wischmeier, M.; Bernert, M. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.12.008	journal	August 2015
Far scrape-off layer particle and heat fluxes in high density – High power scenarios Müller, H. W.; Bernert, M.; Carralero, D. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2015.01.012	journal	August 2015
A study on the density shoulder formation in the SOL of H-mode plasmas Carralero, D.; Madsen, J.; Artene, S. A. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.11.016	journal	August 2017
Spectroscopic investigations of divertor detachment in TCV Verhaegh, K.; Lipschultz, B.; Duval, B. P. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.01.004	journal	August 2017
The high field side high density region in SOLPS-modeling of nitrogen-seeded H-modes in ASDEX Upgrade Reimold, F.; Wischmeier, M.; Potzel, S. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.01.010	journal	August 2017
Fast bolometric measurements on the TCV tokamak Furno, I.; Weisen, H.; Mlynar, J. Review of Scientific Instruments, Vol. 70, Issue 12 https://doi.org/10.1063/1.1150111	journal	December 1999
Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod LaBombard, B.; Boivin, R. L.; Greenwald, M. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1352596	journal	May 2001
Transport by intermittent convection in the boundary of the DIII-D tokamak Boedo, J. A.; Rudakov, D.; Moyer, R. Physics of Plasmas, Vol. 8, Issue 11 https://doi.org/10.1063/1.1406940	journal	November 2001
Collisionality and magnetic geometry effects on tokamak edge turbulent transport. I. A two-region model with application to blobs Myra, J. R.; Russell, D. A.; D’Ippolito, D. A. Physics of Plasmas, Vol. 13, Issue 11 https://doi.org/10.1063/1.2364858	journal	November 2006
Intermittent fluctuations in the Alcator C-Mod scrape-off layer Garcia, O. E.; Fritzner, S. M.; Kube, R. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4802942	journal	May 2013
Comparison of edge turbulence imaging at two different poloidal locations in the scrape-off layer of Alcator C-Mod Zweben, S. J.; Terry, J. L.; Agostini, M. Physics of Plasmas, Vol. 20, Issue 7 https://doi.org/10.1063/1.4813758	journal	July 2013
Edge transport studies in the edge and scrape-off layer of the National Spherical Torus Experiment with Langmuir probes Boedo, J. A.; Myra, J. R.; Zweben, S. Physics of Plasmas, Vol. 21, Issue 4 https://doi.org/10.1063/1.4873390	journal	April 2014
Plasma particle sources due to interactions with neutrals in a turbulent scrape-off layer of a toroidally confined plasma Thrysøe, A. S.; Løiten, M.; Madsen, J. Physics of Plasmas, Vol. 25, Issue 3 https://doi.org/10.1063/1.5019662	journal	March 2018
Analysis of wall-embedded Langmuir probe signals in different conditions on the Tokamak à Configuration Variable Février, O.; Theiler, C.; De Oliveira, H. Review of Scientific Instruments, Vol. 89, Issue 5 https://doi.org/10.1063/1.5022459	journal	May 2018
Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing Carr, M.; Meakins, A.; Bernert, M. Review of Scientific Instruments, Vol. 89, Issue 8 https://doi.org/10.1063/1.5031087	journal	August 2018
Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited) Griener, M.; Wolfrum, E.; Cavedon, M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5034446	journal	October 2018
Filamentary velocity scaling validation in the TCV tokamak Tsui, C. K.; Boedo, J. A.; Myra, J. R. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5038019	journal	July 2018
Overview of ASDEX Upgrade results Gruber, O.; Arslanbekov, R.; Atanasiu, C. Nuclear Fusion, Vol. 41, Issue 10 https://doi.org/10.1088/0029-5515/41/10/306	journal	October 2001
Far SOL transport and main wall plasma interaction in DIII-D Rudakov, D. L.; Boedo, J. A.; Moyer, R. A. Nuclear Fusion, Vol. 45, Issue 12 https://doi.org/10.1088/0029-5515/45/12/014	journal	November 2005
Fluctuations and transport in the TCV scrape-off layer Garcia, O. E.; Horacek, J.; Pitts, R. A. Nuclear Fusion, Vol. 47, Issue 7 https://doi.org/10.1088/0029-5515/47/7/017	journal	June 2007
Overview of ASDEX Upgrade results Kallenbach, A.; Adamek, J.; Aho-Mantila, L. Nuclear Fusion, Vol. 51, Issue 9 https://doi.org/10.1088/0029-5515/51/9/094012	journal	August 2011
An experimental investigation of the high density transition of the scrape-off layer transport in ASDEX Upgrade Carralero, D.; Birkenmeier, G.; Müller, H. W. Nuclear Fusion, Vol. 54, Issue 12 https://doi.org/10.1088/0029-5515/54/12/123005	journal	November 2014
A first-principles self-consistent model of plasma turbulence and kinetic neutral dynamics in the tokamak scrape-off layer Wersal, C.; Ricci, P. Nuclear Fusion, Vol. 55, Issue 12 https://doi.org/10.1088/0029-5515/55/12/123014	journal	November 2015
Filament transport, warm ions and erosion in ASDEX Upgrade L-modes Birkenmeier, G.; Manz, P.; Carralero, D. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033018	journal	February 2015
Impact of a narrow limiter SOL heat flux channel on the ITER first wall panel shaping Kocan, M.; Pitts, R. A.; Arnoux, G. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033019	journal	February 2015
Investigation of the origin of neutrals in the main chamber of Alcator C-Mod Lipschultz, B.; LaBombard, B.; Pitcher, C. S. Plasma Physics and Controlled Fusion, Vol. 44, Issue 6 https://doi.org/10.1088/0741-3335/44/6/309	journal	May 2002
Collisionality dependent transport in TCV SOL plasmas Garcia, O. E.; Pitts, R. A.; Horacek, J. Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B https://doi.org/10.1088/0741-3335/49/12B/S03	journal	November 2007
Interpretation of D _α video diagnostics data as a contribution to plasma edge characterization Harhausen, J.; Kallenbach, A.; Fuchs, C. Plasma Physics and Controlled Fusion, Vol. 53, Issue 2 https://doi.org/10.1088/0741-3335/53/2/025002	journal	December 2010
Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade Fuchert, G.; Birkenmeier, G.; Carralero, D. Plasma Physics and Controlled Fusion, Vol. 56, Issue 12 https://doi.org/10.1088/0741-3335/56/12/125001	journal	October 2014
Characterization of the Li-BES at ASDEX Upgrade Willensdorfer, M.; Birkenmeier, G.; Fischer, R. Plasma Physics and Controlled Fusion, Vol. 56, Issue 2 https://doi.org/10.1088/0741-3335/56/2/025008	journal	January 2014
Magnetic field dependence of the blob dynamics in the edge of ASDEX upgrade L-mode plasmas Birkenmeier, G.; Laggner, F. M.; Willensdorfer, M. Plasma Physics and Controlled Fusion, Vol. 56, Issue 7 https://doi.org/10.1088/0741-3335/56/7/075019	journal	June 2014
Scrape-off layer turbulence in TCV: evidence in support of stochastic modelling Theodorsen, A.; Garcia, O. E.; Horacek, J. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044006	journal	January 2016
The influence of blobs on neutral particles in the scrape-off layer Thrysøe, Alexander S.; Tophøj, Laust E. H.; Naulin, Volker Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044010	journal	March 2016
Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation Agostini, M.; Vianello, N.; Carraro, L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab4122	journal	September 2019
Results from recent detachment experiments in alternative divertor configurations on TCV Theiler, C.; Lipschultz, B.; Harrison, J. Nuclear Fusion, Vol. 57, Issue 7 https://doi.org/10.1088/1741-4326/aa5fb7	journal	March 2017
Recent progress towards a quantitative description of filamentary SOL transport Carralero, D.; Siccinio, M.; Komm, M. Nuclear Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/1741-4326/aa64b3	journal	April 2017
Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV Vianello, N.; Tsui, C.; Theiler, C. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7db3	journal	August 2017
Correlation of the tokamak H-mode density limit with ballooning stability at the separatrix Eich, T.; Goldston, R. J.; Kallenbach, A. Nuclear Fusion, Vol. 58, Issue 3 https://doi.org/10.1088/1741-4326/aaa340	journal	January 2018
Investigation into the formation of the scrape-off layer density shoulder in JET ITER-like wall L-mode and H-mode plasmas Wynn, A.; Lipschultz, B.; Cziegler, I. Nuclear Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/1741-4326/aaad78	journal	February 2018
Influence of molecular dissociation on blob-induced atom density perturbations Thrysøe, A. S.; Madsen, J.; Naulin, V. Nuclear Fusion, Vol. 58, Issue 9 https://doi.org/10.1088/1741-4326/aac8a4	journal	July 2018
On the role of filaments in perpendicular heat transport at the scrape-off layer Carralero, D.; Artene, S.; Bernert, M. Nuclear Fusion, Vol. 58, Issue 9 https://doi.org/10.1088/1741-4326/aacb04	journal	July 2018
Physics research on the TCV tokamak facility: from conventional to alternative scenarios and beyond Coda, S.; Agostini, M.; Albanese, R. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab25cb	journal	August 2019
Experimental Validation of a Filament Transport Model in Turbulent Magnetized Plasmas Carralero, D.; Manz, P.; Aho-Mantila, L. Physical Review Letters, Vol. 115, Issue 21 https://doi.org/10.1103/PhysRevLett.115.215002	journal	November 2015
Tomographic diagnostic of the hydrogen beam from a negative ion source Agostini, M.; Brombin, M.; Serianni, G. Physical Review Special Topics - Accelerators and Beams, Vol. 14, Issue 10 https://doi.org/10.1103/PhysRevSTAB.14.102801	journal	October 2011
An experimental investigation on the high density transition of the Scrape-off Layer transport in ASDEX Upgrade Carralero, D.; Birkenmeier, G.; Müller, H. W. arXiv https://doi.org/10.48550/arxiv.1407.3618	text	January 2014
Experimental validation of a filament transport model in turbulent magnetized plasmas Carralero, D.; Manz, P.; Aho-Mantila, L. arXiv https://doi.org/10.48550/arxiv.1505.07741	text	January 2015
Spectroscopic investigations of divertor detachment in TCV Verhaegh, K.; Lipschultz, B.; Duval, B. P. arXiv https://doi.org/10.48550/arxiv.1607.04539	text	January 2016
On the role of filaments in perpendicular heat transport at the Scrape-off Layer Carralero, D.; Artene, S.; Bernert, M. arXiv https://doi.org/10.48550/arxiv.2005.06244	text	January 2020
Recent progress towards a quantitative description of filamentary SOL transport Carralero, D.; Siccinio, M.; Komm, M. arXiv https://doi.org/10.48550/arxiv.2005.06250	text	January 2020

Cited By (1)

Edge turbulence approaching the density limit in RFX-mod experiment Agostini, M.; Scarin, P. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab53b6	journal	November 2019

Similar Records

Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV

Journal Article · Wed Aug 02 20:00:00 EDT 2017 · Nuclear Fusion · OSTI ID:1540522

Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV

Journal Article · Mon Aug 15 20:00:00 EDT 2022 · Nuclear Fusion · OSTI ID:1979422

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
SOL
filaments
physics
tokamak
transport
turbulence

Scrape-off layer transport and filament characteristics in high-density tokamak regimes

Citation Formats

References (55)

Cited By (1)

Similar Records

Related Subjects