Filamentary velocity scaling validation in the TCV tokamak

Tsui, C. K.; Boedo, J. A.; Myra, J. R.; Duval, B.; Labit, B.; Theiler, C.; Vianello, N.; Vijvers, W. A. J.; Reimerdes, H.; Coda, S.; Février, O.; Harrison, J. R.; Horacek, J.; Lipschultz, B.; Maurizio, R.; Nespoli, F.; Sheikh, U.; Verhaegh, K.; Walkden, N.

doi:10.1063/1.5038019

Title: Filamentary velocity scaling validation in the TCV tokamak

Journal Article · Tue Jul 17 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5038019· OSTI ID:1540225

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^[3]; Duval, B. ^[4]; Labit, B. ^[4];

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^[5]; Vijvers, W. A. J. ^[6]; Reimerdes, H. ^[4]; Coda, S. ^[4];

^[4]; Harrison, J. R. ^[7];

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^[9]; Maurizio, R. ^[4]; Nespoli, F. ^[4];

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^[10]; Walkden, N. ^[7]

Univ. of California San Diego (UCSD), La Jolla, CA (United States); Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland)
Univ. of California San Diego (UCSD), La Jolla, CA (United States)
Lodestar Research Corp., Boulder, CO (United States)
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland)
Consorzio RFX, Padova (Italy)
FOM Inst. DIFFER “Dutch Inst. for Fundamental Energy Research,” Eindhoven (The Netherlands)
Culham Science Centre, Oxon (United Kingdom)
IPP.CR, Inst. of Plasma Physics AS CR, Praha (Czech Republic)
Univ. of York, York (United Kingdom)
Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland); Univ. of York, York (United Kingdom)

A large database of reciprocating probe data from the edge plasma of TCV (Tokamak à Configuration Variable) is used to test the radial velocity scalings of filaments from analytical theory. The measured velocities are mainly scattered between zero and a maximum velocity which varies as a function of size and collisionality in agreement with the analytical scalings. The scatter is consistent with mechanisms that tend to slow the velocity of individual filaments. While the radial velocities were mainly clustered between 0.5 and 2 km/s, a minority reached outward velocities as high as 5 km/s or inward velocities as high as –4 km/s. Inward moving filaments are only observed in regions of high poloidal velocity shear in discharges with B × ∇B away from the X-point, a new finding. Here, the filaments have diameters clustered between 3 and 11 mm, and normalized sizes $$\hat{a}$$ clustered between 0.3 and 1.1, such that most filaments populate the resistive-ballooning regime; therefore, most of the filaments in TCV have radial velocities with little or no dependence on collisionality. Improvements in cross-correlation techniques and conditional averaging techniques are discussed which reduce the sizes determined for the largest filaments, including those larger than the scrape-off layer.

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Research Organization:: Lodestar Research Corp., Boulder, CO (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: TCV Team; EUROfusion MST1 Team

Grant/Contract Number:: FG02-97ER54392; SC0010529

OSTI ID:: 1540225

Alternate ID(s):: OSTI ID: 1460602

Journal Information:: Physics of Plasmas, Vol. 25, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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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

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Blob wakes in NSTX Zweben, S. J.; Myra, J. R.; Diallo, A. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5094872	journal	July 2019
MANTIS: A real-time quantitative multispectral imaging system for fusion plasmas Perek, A.; Vijvers, W. A. J.; Andrebe, Y. Review of Scientific Instruments, Vol. 90, Issue 12 https://doi.org/10.1063/1.5115569	journal	December 2019
New diagnostic tools for transport measurements in the scrape-off layer (SOL) of medium-size tokamaks Schneider, B. S.; Ionita, C.; Costea, S. Plasma Physics and Controlled Fusion, Vol. 61, Issue 5 https://doi.org/10.1088/1361-6587/ab0596	journal	March 2019
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
3D structure and dynamics of filaments in turbulence simulations of WEST diverted plasmas Nespoli, F.; Tamain, P.; Fedorczak, N. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2813	journal	July 2019
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
Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX Scotti, F.; Zweben, S.; Myra, J. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5886	journal	December 2019
Shaping effects on scrape-off layer plasma turbulence: A rigorous validation of three-dimensional simulations against TCV measurements Riva, F.; Tsui, C. K.; Boedo, J. A. Physics of Plasmas, Vol. 27, Issue 1 https://doi.org/10.1063/1.5123451	journal	January 2020
Theory-based scaling laws of near and far scrape-off layer widths in single-null L-mode discharges Giacomin, M.; Stagni, A.; Ricci, P. Nuclear Fusion, Vol. 61, Issue 7 https://doi.org/10.1088/1741-4326/abf8f6	journal	May 2021

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