Filamentary velocity scaling validation and spin dynamics in the DIII-D tokamak

Molesworth, Steven C.; Boedo, Jose A.; Tsui, Cedric K.; Perillo, Renato; Rudakov, Dmitry L.

doi:10.1063/5.0195025

Title: Filamentary velocity scaling validation and spin dynamics in the DIII-D tokamak

Journal Article · 22 April 2024 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0195025 · OSTI ID:2345058

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Univ. of California, San Diego, La Jolla, CA (United States); General Atomics
Univ. of California, San Diego, La Jolla, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Measured filament velocities in the DIII-D tokamak are compared against theoretical scalings, finding that the latter often represents an upper limit on experimental velocity distributions with most filaments possessing lower velocity. Filament spin from internal E × B drift is experimentally demonstrated to alter filament radial velocity. A critical spin velocity, where filament radial velocity peaks, is observed and corresponds to approximately 5 km/s. This transition is corroborated using a less direct measure of filament spin in the form of a temperature ratio. These techniques are combined to find that the critical spin velocity closely aligns with transport times along and across filaments becoming comparable. The normalized filament size distribution is consistent with the most stable size as dictated by Kelvin–Helmholtz and curvature-driven instabilities. Overall, the findings suggest filament stability and spin alter filamentary transport that may threaten the integrity of first walls in fusion devices.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC) Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; FG02-07ER54917; SC0010529

OSTI ID:: 2345058

Alternate ID(s):: OSTI ID: 2567687

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 31; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Estimating the error in filament propagation measurement using a synthetic probe Shanahan, B.; Killer, C.; Pechstein, G. Plasma Physics and Controlled Fusion, Vol. 63, Issue 12 https://doi.org/10.1088/1361-6587/ac2ff7	journal	November 2021
Collisionality and magnetic geometry effects on tokamak edge turbulent transport. II. Many-blob turbulence in the two-region model Russell, D. A.; Myra, J. R.; D’Ippolito, D. A. Physics of Plasmas, Vol. 14, Issue 10 https://doi.org/10.1063/1.2780137	journal	October 2007
Comparison between mirror Langmuir probe and gas-puff imaging measurements of intermittent fluctuations in the Alcator C-Mod scrape-off layer Kube, R.; Theodorsen, A.; Garcia, O. E. Journal of Plasma Physics, Vol. 86, Issue 5 https://doi.org/10.1017/S0022377820001282	journal	October 2020
On scrape off layer plasma transport Krasheninnikov, S. I. Physics Letters A, Vol. 283, Issue 5-6 https://doi.org/10.1016/S0375-9601(01)00252-3	journal	May 2001
Plasma-material interactions in current tokamaks and their implications for next step fusion reactors Federici, G.; Skinner, C. H.; Brooks, J. N. Nuclear Fusion, Vol. 41, Issue 12 https://doi.org/10.1088/0029-5515/41/12/218	journal	December 2001
Blob Dynamics in 3D BOUT Simulations of Tokamak Edge Turbulence Russell, D. A.; D'Ippolito, D. A.; Myra, J. R. Physical Review Letters, Vol. 93, Issue 26 https://doi.org/10.1103/PhysRevLett.93.265001	journal	December 2004
The effects of shape and amplitude on the velocity of scrape-off layer filaments Omotani, J. T.; Militello, F.; Easy, L. Plasma Physics and Controlled Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/0741-3335/58/1/014030	journal	November 2015
Effects of parallel electron dynamics on plasma blob transport Angus, Justin R.; Krasheninnikov, Sergei I.; Umansky, Maxim V. Physics of Plasmas, Vol. 19, Issue 8 https://doi.org/10.1063/1.4747619	journal	August 2012
Nonlinear analysis of turbulence across the L to H transition Moyer, R. A.; Lehmer, R. D.; Evans, T. E. Plasma Physics and Controlled Fusion, Vol. 38, Issue 8 https://doi.org/10.1088/0741-3335/38/8/021	journal	August 1996
Temperature dynamics and velocity scaling laws for interchange driven, warm ion plasma filaments Olsen, Jeppe; Madsen, Jens; Nielsen, Anders Henry Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044011	journal	February 2016
On the interaction of scrape off layer filaments Militello, F.; Dudson, B.; Easy, L. Plasma Physics and Controlled Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1361-6587/aa9252	journal	November 2017
The origin of the long time correlations of the density fluctuations in the scrape-off layer of the Tore Supra Tokamak Devynck, P.; Ghendrih, P.; Sarazin, Y. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1894399	journal	May 2005
Dynamical simulations of boundary plasma turbulence in divertor geometry Xu, X. Q.; Nevins, W. M.; Cohen, R. H. New Journal of Physics, Vol. 4 https://doi.org/10.1088/1367-2630/4/1/353	journal	July 2002
Conditional analysis of floating potential fluctuations at the edge of the Texas Experimental Tokamak Upgrade (TEXT‐U) Filippas, A. V.; Bengston, Roger D.; Li, G. ‐X. Physics of Plasmas, Vol. 2, Issue 3 https://doi.org/10.1063/1.871435	journal	March 1995
Transport barrier and spinning blob dynamics in the tokamak edge Cheng, Junyi; Myra, James; Ku, Seung-Hoe Nuclear Fusion, Vol. 63, Issue 8 https://doi.org/10.1088/1741-4326/acdf01	journal	June 2023
Investigation of the effect of resistivity on scrape off layer filaments using three-dimensional simulations Easy, L.; Militello, F.; Omotani, J. Physics of Plasmas, Vol. 23, Issue 1 https://doi.org/10.1063/1.4940330	journal	January 2016
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
Two-dimensional reconstruction of filament temperatures and densities with the thermal helium beam at ASDEX Upgrade Wendler, D.; Birkenmeier, G.; Griener, M. Physics of Plasmas, Vol. 30, Issue 9 https://doi.org/10.1063/5.0164057	journal	September 2023
Cross-field blob transport in tokamak scrape-off-layer plasmas D’Ippolito, D. A.; Myra, J. R.; Krasheninnikov, S. I. Physics of Plasmas, Vol. 9, Issue 1 https://doi.org/10.1063/1.1426394	journal	January 2002
Novel angular velocity estimation technique for plasma filaments Lampert, M.; Diallo, A.; Zweben, S. J. Review of Scientific Instruments, Vol. 94, Issue 1 https://doi.org/10.1063/5.0128818	journal	January 2023

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