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

Abstract

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 themore »« less

Authors:

^[1];

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

^[3]; Bernert, M. ^[4];

^[2];

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

^[7];

^[3];

^[3]; Tsitrone, E. ^[5];

^[8]

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)

Publication Date:: Tue Aug 16 00:00:00 EDT 2022

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

Sponsoring Org.:: USDOE Office of Science (SC)

Contributing Org.:: EUROfusion MST1 Team; TCV Team

OSTI Identifier:: 1979422

Grant/Contract Number:: SC0010529

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 62; Journal Issue: 9; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; H-mode; ELMs; QCE; scrape-off layer; E-folding lengths; blob-filaments

Citation Formats


                    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., and Walkden, N. Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV.  United States: N. p., 2022. 
Web.  doi:10.1088/1741-4326/ac8234.

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                    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. Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV.  United States.  https://doi.org/10.1088/1741-4326/ac8234

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                    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., and Walkden, N. Tue .  
"Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV".  United States.  https://doi.org/10.1088/1741-4326/ac8234.  https://www.osti.gov/servlets/purl/1979422.

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@article{osti_1979422,

  title        = {Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV},

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

  abstractNote = {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 αt 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 αt 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 αt. 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.},

  doi          = {10.1088/1741-4326/ac8234},

  journal      = {Nuclear Fusion},

  number       = 9,

  volume       = 62,

  place        = {United States},

  year         = {Tue Aug 16 00:00:00 EDT 2022},

  month        = {Tue Aug 16 00:00:00 EDT 2022}

}

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

Abstract

Citation Formats

Parameter dependences of small edge localized modes (ELMs) journal, September 2018

Fluctuations and transport in the TCV scrape-off layer journal, June 2007

Far scrape-off layer particle and heat fluxes in high density – High power scenarios journal, August 2015

Nitrogen-seeded divertor detachment in TCV L-mode plasmas journal, February 2020

Blob velocity scaling in diverted tokamaks: A comparison between theory and simulation journal, March 2019

Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime journal, July 1999

Fast gas injection system for plasma physics experiments journal, June 1984

Inter-ELM Power Decay Length for JET and ASDEX Upgrade: Measurement and Comparison with Heuristic Drift-Based Model journal, November 2011

Edge turbulence and SOL transport in tokamaks journal, June 2009

A new look at density limits in tokamaks journal, December 1988

Initial TCV operation with a baffled divertor journal, January 2021

Filamentary velocity scaling validation in the TCV tokamak journal, July 2018

Physics basis for the first ITER tungsten divertor journal, August 2019

Neutral beam heating on the TCV tokamak journal, November 2017

Implications of high density operation on SOL transport: A multimachine investigation journal, August 2015

Energy flux to the ASDEX-Upgrade diverter plates determined by thermography and calorimetry journal, January 1995

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Characterization of edge profiles and fluctuations in discharges with type-II and nitrogen-mitigated edge localized modes in ASDEX Upgrade journal, June 2011

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Scrape-off layer transport and filament characteristics in high-density tokamak regimes journal, October 2019

TCV heating and divertor upgrades journal, November 2019

Tokamak equilibrium reconstruction code LIUQE and its real time implementation journal, February 2015

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On the role of filaments in perpendicular heat transport at the scrape-off layer journal, July 2018

H-mode scrape-off layer power width in the TCV tokamak journal, January 2021

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Real time capable infrared thermography for ASDEX Upgrade journal, November 2015

Theoretical aspects and practical implications of the heuristic drift SOL model journal, August 2015

A study on the density shoulder formation in the SOL of H-mode plasmas journal, August 2017

Overview of the TCV tokamak experimental programme journal, March 2022

Experimental Validation of a Filament Transport Model in Turbulent Magnetized Plasmas journal, November 2015

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Identifying the location of the OMP separatrix in DIII-D using power accounting journal, August 2015

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Erratum: “Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime” [Phys. Plasmas 6 , 2834 (1999)] journal, December 2002

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Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks journal, December 2011

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Progress in quantifying the edge physics of the H mode regime in DIII-D journal, December 2001

Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER journal, August 2013

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Fast bolometric measurements on the TCV tokamak journal, December 1999

Far SOL transport and main wall plasma interaction in DIII-D journal, November 2005

Convective transport by intermittent blob-filaments: Comparison of theory and experiment journal, June 2011

Parameter dependences of small edge localized modes (ELMs)
journal, September 2018

Fluctuations and transport in the TCV scrape-off layer
journal, June 2007

Far scrape-off layer particle and heat fluxes in high density – High power scenarios
journal, August 2015

Nitrogen-seeded divertor detachment in TCV L-mode plasmas
journal, February 2020

Blob velocity scaling in diverted tokamaks: A comparison between theory and simulation
journal, March 2019

Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999

Fast gas injection system for plasma physics experiments
journal, June 1984

Inter-ELM Power Decay Length for JET and ASDEX Upgrade: Measurement and Comparison with Heuristic Drift-Based Model
journal, November 2011

Edge turbulence and SOL transport in tokamaks
journal, June 2009

A new look at density limits in tokamaks
journal, December 1988

Initial TCV operation with a baffled divertor
journal, January 2021

Filamentary velocity scaling validation in the TCV tokamak
journal, July 2018

Physics basis for the first ITER tungsten divertor
journal, August 2019

Neutral beam heating on the TCV tokamak
journal, November 2017

Implications of high density operation on SOL transport: A multimachine investigation
journal, August 2015

Energy flux to the ASDEX-Upgrade diverter plates determined by thermography and calorimetry
journal, January 1995

Type II ELMy H modes on ASDEX Upgrade with good confinement at high density
journal, September 2001

Characterization of edge profiles and fluctuations in discharges with type-II and nitrogen-mitigated edge localized modes in ASDEX Upgrade
journal, June 2011

Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure
journal, June 2005

Collisionality and magnetic geometry effects on tokamak edge turbulent transport. I. A two-region model with application to blobs
journal, November 2006

Continuous observation of filaments from the confined region to the far scrape-off layer
journal, December 2020

Scrape-off layer transport and filament characteristics in high-density tokamak regimes
journal, October 2019

TCV heating and divertor upgrades
journal, November 2019

Tokamak equilibrium reconstruction code LIUQE and its real time implementation
journal, February 2015

A new scaling for divertor detachment
journal, March 2017

On the role of filaments in perpendicular heat transport at the scrape-off layer
journal, July 2018

H-mode scrape-off layer power width in the TCV tokamak
journal, January 2021

The nonlinear drift wave instability and its role in tokamak edge turbulence
journal, July 2002

Phase Space of Tokamak Edge Turbulence, the $L - H$ Transition, and the Formation of the Edge Pedestal
journal, November 1998

Langmuir probe electronics upgrade on the tokamak à configuration variable
journal, August 2019

Analysis of wall-embedded Langmuir probe signals in different conditions on the Tokamak à Configuration Variable
journal, May 2018

Real time capable infrared thermography for ASDEX Upgrade
journal, November 2015

Theoretical aspects and practical implications of the heuristic drift SOL model
journal, August 2015

A study on the density shoulder formation in the SOL of H-mode plasmas
journal, August 2017

Overview of the TCV tokamak experimental programme
journal, March 2022

Experimental Validation of a Filament Transport Model in Turbulent Magnetized Plasmas
journal, November 2015

Neutral pressure and separatrix density related models for seed impurity divertor radiation in ASDEX Upgrade
journal, January 2019

Identifying the location of the OMP separatrix in DIII-D using power accounting
journal, August 2015

Divertor power load studies for attached L-mode single-null plasmas in TCV
journal, December 2017

Pedestal structure and energy confinement studies on TCV
journal, November 2018

Erratum: “Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime” [Phys. Plasmas 6 , 2834 (1999)]
journal, December 2002

Broadening of the power fall-off length in a high density, high confinement H-mode regime in ASDEX Upgrade
journal, March 2021

Heuristic drift-based model of the power scrape-off width in low-gas-puff H-mode tokamaks
journal, December 2011

Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod
journal, May 2001

Progress in quantifying the edge physics of the H mode regime in DIII-D
journal, December 2001

Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER
journal, August 2013

Turbulence driven widening of the near-SOL power width in ASDEX Upgrade H-Mode discharges
journal, April 2020

Cross-field and parallel dynamics of SOL filaments in TCV
journal, August 2022

Assessment of the baseline scenario at q ₉₅ ~ 3 for ITER
journal, September 2018

Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade
journal, June 2019

Tokamak edge turbulence: background theory and computation
journal, June 2007

Improving spatial and spectral resolution of TCV Thomson scattering
journal, December 2017

Fast bolometric measurements on the TCV tokamak
journal, December 1999

Far SOL transport and main wall plasma interaction in DIII-D
journal, November 2005

Convective transport by intermittent blob-filaments: Comparison of theory and experiment
journal, June 2011