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

Stagni, A.; Vianello, N.; Tsui, C. K.; Colandrea, C.; Gorno, S.; Bernert, M.; Boedo, J. A.; Brida, D.; Falchetto, G.; Hakola, A.; Harrer, G.; Reimerdes, H.; Theiler, C.; Tsitrone, E.; Walkden, N.

doi:10.1088/1741-4326/ac8234

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

Journal Article · Tue Aug 16 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac8234· OSTI ID:1979422

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^[2]; Colandrea, C. ^[3];

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^[4]; Falchetto, G. ^[5]; Hakola, A. ^[6];

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Consorzio RFX (Italy)
Univ. of California, San Diego, CA (United States)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
CEA, IRFM, Saint Paul Lez Durance (France)
VTT Technical Research Centre (Finland)
Technische Univ. Wien (Austria)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

A set of high density, highly shaped H-mode discharges has been performed in the TCV tokamak with the aim of assessing the effects of increasing divertor neutral recycling on the properties of upstream inter-ELM scrape-off layer (SOL) profiles and transport. An increase of divertor neutral pressure has been correlated with the evolution of separatrix properties and turbulence level. The latter has been quantified by means of the α_t parameter introduced in (Eich 2020 Nucl. Fusion 60 056016), describing the contribution of resistive-interchange turbulence in the SOL relative to drift wave transport. The analysis reveals a general broadening of the upstream SOL profiles as α_t increases, with the SOL power width measured by the vertical IR thermography system increasing significantly. In a similar way, the upstream density profile widens in the near SOL, whereas in the far SOL a density shoulder is observed to progressively form and increase in amplitude. This behaviour is associated with an enhancement of far SOL turbulent transport in the form of blob-filaments travelling radially faster across the far SOL and becoming bigger at higher α_t. Finally, the detected filaments, evaluated from the fast reciprocating probe at the outer midplane, are determined to mostly belong to the resistive ballooning and resistive X-point regimes.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: EUROfusion MST1 Team; TCV Team

Grant/Contract Number:: SC0010529

OSTI ID:: 1979422

Journal Information:: Nuclear Fusion, Vol. 62, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (55)

Parameter dependences of small edge localized modes (ELMs) Harrer, G. F.; Wolfrum, E.; Dunne, M. G. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aad757	journal	September 2018
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
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
Nitrogen-seeded divertor detachment in TCV L-mode plasmas Février, O.; Theiler, C.; Harrison, J. R. Plasma Physics and Controlled Fusion, Vol. 62, Issue 3 https://doi.org/10.1088/1361-6587/ab6b00	journal	February 2020
Blob velocity scaling in diverted tokamaks: A comparison between theory and simulation Paruta, Paola; Beadle, C.; Ricci, P. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5080675	journal	March 2019
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime Sauter, O.; Angioni, C.; Lin-Liu, Y. R. Physics of Plasmas, Vol. 6, Issue 7 https://doi.org/10.1063/1.873240	journal	July 1999
Fast gas injection system for plasma physics experiments Bates, S. C.; Burrell, K. H. Review of Scientific Instruments, Vol. 55, Issue 6 https://doi.org/10.1063/1.1137845	journal	June 1984
Inter-ELM Power Decay Length for JET and ASDEX Upgrade: Measurement and Comparison with Heuristic Drift-Based Model Eich, T.; Sieglin, B.; Scarabosio, A. Physical Review Letters, Vol. 107, Issue 21 https://doi.org/10.1103/physrevlett.107.215001	journal	November 2011
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
A new look at density limits in tokamaks Greenwald, M.; Terry, J. L.; Wolfe, S. M. Nuclear Fusion, Vol. 28, Issue 12 https://doi.org/10.1088/0029-5515/28/12/009	journal	December 1988
Initial TCV operation with a baffled divertor Reimerdes, H.; Duval, B. P.; Elaian, H. Nuclear Fusion, Vol. 61, Issue 2 https://doi.org/10.1088/1741-4326/abd196	journal	January 2021
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
Physics basis for the first ITER tungsten divertor Pitts, R. A.; Bonnin, X.; Escourbiac, F. Nuclear Materials and Energy, Vol. 20 https://doi.org/10.1016/j.nme.2019.100696	journal	August 2019
Neutral beam heating on the TCV tokamak Karpushov, Alexander N.; Chavan, René; Coda, Stefano Fusion Engineering and Design, Vol. 123 https://doi.org/10.1016/j.fusengdes.2017.02.076	journal	November 2017
Implications of high density operation on SOL transport: A multimachine investigation Carralero, D.; Müller, H. W.; Groth, M. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.10.019	journal	August 2015
Energy flux to the ASDEX-Upgrade diverter plates determined by thermography and calorimetry Herrmann, A.; Junker, W.; Gunther, K. Plasma Physics and Controlled Fusion, Vol. 37, Issue 1 https://doi.org/10.1088/0741-3335/37/1/002	journal	January 1995
Type II ELMy H modes on ASDEX Upgrade with good confinement at high density Stober, J.; Maraschek, M.; Conway, G. D. Nuclear Fusion, Vol. 41, Issue 9 https://doi.org/10.1088/0029-5515/41/9/301	journal	September 2001
Characterization of edge profiles and fluctuations in discharges with type-II and nitrogen-mitigated edge localized modes in ASDEX Upgrade Wolfrum, E.; Bernert, M.; Boom, J. E. Plasma Physics and Controlled Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0741-3335/53/8/085026	journal	June 2011
Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure Scott, Bruce D. Physics of Plasmas, Vol. 12, Issue 6 https://doi.org/10.1063/1.1917866	journal	June 2005
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
Continuous observation of filaments from the confined region to the far scrape-off layer Griener, M.; Wolfrum, E.; Birkenmeier, G. Nuclear Materials and Energy, Vol. 25 https://doi.org/10.1016/j.nme.2020.100854	journal	December 2020
Scrape-off layer transport and filament characteristics in high-density tokamak regimes Vianello, N.; Carralero, D.; Tsui, C. K. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab423e	journal	October 2019
TCV heating and divertor upgrades Fasoli, A.; Reimerdes, H.; Alberti, S. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab4c56	journal	November 2019
Tokamak equilibrium reconstruction code LIUQE and its real time implementation Moret, J. -M.; Duval, B. P.; Le, H. B. Fusion Engineering and Design, Vol. 91 https://doi.org/10.1016/j.fusengdes.2014.09.019	journal	February 2015
A new scaling for divertor detachment Goldston, R. J.; Reinke, M. L.; Schwartz, J. A. Plasma Physics and Controlled Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1361-6587/aa5e6e	journal	March 2017
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
H-mode scrape-off layer power width in the TCV tokamak Maurizio, R.; Duval, B. P.; Labit, B. Nuclear Fusion, Vol. 61, Issue 2 https://doi.org/10.1088/1741-4326/abd147	journal	January 2021
The nonlinear drift wave instability and its role in tokamak edge turbulence Scott, Bruce D. New Journal of Physics, Vol. 4 https://doi.org/10.1088/1367-2630/4/1/352	journal	July 2002
Phase Space of Tokamak Edge Turbulence, the $L - H$ Transition, and the Formation of the Edge Pedestal Rogers, B. N.; Drake, J. F.; Zeiler, A. Physical Review Letters, Vol. 81, Issue 20 https://doi.org/10.1103/physrevlett.81.4396	journal	November 1998
Langmuir probe electronics upgrade on the tokamak à configuration variable De Oliveira, H.; Marmillod, P.; Theiler, C. Review of Scientific Instruments, Vol. 90, Issue 8 https://doi.org/10.1063/1.5108876	journal	August 2019
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
Real time capable infrared thermography for ASDEX Upgrade Sieglin, B.; Faitsch, M.; Herrmann, A. Review of Scientific Instruments, Vol. 86, Issue 11 https://doi.org/10.1063/1.4935580	journal	November 2015
Theoretical aspects and practical implications of the heuristic drift SOL model Goldston, R. J. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.10.080	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
Overview of the TCV tokamak experimental programme Reimerdes, H.; Agostini, M.; Alessi, E. Nuclear Fusion, Vol. 62, Issue 4 https://doi.org/10.1088/1741-4326/ac369b	journal	March 2022
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
Neutral pressure and separatrix density related models for seed impurity divertor radiation in ASDEX Upgrade Kallenbach, A.; Bernert, M.; Dux, R. Nuclear Materials and Energy, Vol. 18 https://doi.org/10.1016/j.nme.2018.12.021	journal	January 2019
Identifying the location of the OMP separatrix in DIII-D using power accounting Stangeby, P. C.; Canik, J. M.; Elder, J. D. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093014	journal	August 2015
Divertor power load studies for attached L-mode single-null plasmas in TCV Maurizio, R.; Elmore, S.; Fedorczak, N. Nuclear Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/1741-4326/aa986b	journal	December 2017
Pedestal structure and energy confinement studies on TCV Sheikh, U. A.; Dunne, M.; Frassinetti, L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aae7bd	journal	November 2018
Erratum: “Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime” [Phys. Plasmas 6 , 2834 (1999)] Sauter, O.; Angioni, C.; Lin-Liu, Y. R. Physics of Plasmas, Vol. 9, Issue 12 https://doi.org/10.1063/1.1517052	journal	December 2002
Broadening of the power fall-off length in a high density, high confinement H-mode regime in ASDEX Upgrade Faitsch, M.; Eich, T.; Harrer, G. F. Nuclear Materials and Energy, Vol. 26 https://doi.org/10.1016/j.nme.2020.100890	journal	March 2021
Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks Goldston, R. J. Nuclear Fusion, Vol. 52, Issue 1 https://doi.org/10.1088/0029-5515/52/1/013009	journal	December 2011
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
Progress in quantifying the edge physics of the H mode regime in DIII-D Groebner, R. J.; Baker, D. R.; Burrell, K. H. Nuclear Fusion, Vol. 41, Issue 12 https://doi.org/10.1088/0029-5515/41/12/306	journal	December 2001
Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER Eich, T.; Leonard, A. W.; Pitts, R. A. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093031	journal	August 2013
Turbulence driven widening of the near-SOL power width in ASDEX Upgrade H-Mode discharges Eich, T.; Manz, P.; Goldston, R. J. Nuclear Fusion, Vol. 60, Issue 5 https://doi.org/10.1088/1741-4326/ab7a66	journal	April 2020
Cross-field and parallel dynamics of SOL filaments in TCV Offeddu, N.; Han, W.; Theiler, C. Nuclear Fusion, Vol. 62, Issue 9 https://doi.org/10.1088/1741-4326/ac7ed7	journal	August 2022
Assessment of the baseline scenario at q ₉₅ ~ 3 for ITER Sips, A. C. C.; Schweinzer, J.; Luce, T. C. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aade57	journal	September 2018
Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade Labit, B.; Eich, T.; Harrer, G. F. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2211	journal	June 2019
Tokamak edge turbulence: background theory and computation Scott, Bruce D. Plasma Physics and Controlled Fusion, Vol. 49, Issue 7 https://doi.org/10.1088/0741-3335/49/7/s02	journal	June 2007
Improving spatial and spectral resolution of TCV Thomson scattering Hawke, J.; Andrebe, Y.; Bertizzolo, R. Journal of Instrumentation, Vol. 12, Issue 12 https://doi.org/10.1088/1748-0221/12/12/c12005	journal	December 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
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
Convective transport by intermittent blob-filaments: Comparison of theory and experiment D’Ippolito, D. A.; Myra, J. R.; Zweben, S. J. Physics of Plasmas, Vol. 18, Issue 6 https://doi.org/10.1063/1.3594609	journal	June 2011

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