Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX

Scotti, F.; Zweben, S.; Myra, J.; Maqueda, R.; Soukhanovskii, V.

doi:10.1088/1741-4326/ab5886

Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX

Journal Article · Tue Dec 17 23:00:00 EST 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab5886· OSTI ID:1642353

; ; ; Maqueda, R.;

The connection between scrape off layer (SOL) turbulence at the outer midplane and at the divertor target plate is characterized in the National Spherical Torus Experiment (NSTX). In this work, divertor fluctuations due to midplane blobs are studied by imaging their helical intersection with the divertor plate. Divertor fluctuation levels gradually decrease approaching the outer strike point. Divertor radial turbulence scale lengths as well as radial and poloidal turbulence propagation velocities are comparable to those on the low field side midplane. Strong correlation between divertor and midplane turbulence is observed in the far SOL. The correlation progressively decreases towards the separatrix, along with the decrease in the measured divertor fluctuations. The reduction in correlation is consistent with an electrostatic two-region blob model with perpendicular ion polarization currents due to X-point geometry causing filament disconnection.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344; AC02-09CH11466; FG02-97ER54392

OSTI ID:: 1642353

Alternate ID(s):: OSTI ID: 1643699
OSTI ID: 23013508

Report Number(s):: LLNL-JRNL--774768; 967246

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (51)

Turbulence in the Divertor Region of Tokamak Edge Plasma Umansky, M. V.; Rognlien, T. D.; Xu, X. Q. Contributions to Plasma Physics, Vol. 44, Issue 13 https://doi.org/10.1002/ctpp.200410025	journal	April 2004
Simulation of turbulence in the divertor region of tokamak edge plasma Umansky, M. V.; Rognlien, T. D.; Xu, X. Q. Journal of Nuclear Materials, Vol. 337-339 https://doi.org/10.1016/j.jnucmat.2004.10.021	journal	March 2005
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
Spatial structure of scrape-off-layer filaments near the midplane and X-point regions of Alcator-C-Mod Terry, J. L.; Zweben, S. J.; Umansky, M. V. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.152	journal	June 2009
Assessing material migration through 13C injection experiments Stangeby, P. C. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.11.060	journal	August 2011
Lithium sputtering from lithium-coated plasma facing components in the NSTX divertor Scotti, F.; Soukhanovskii, V. A.; Ahn, J. -W. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.12.032	journal	August 2015
SOL width and intermittent fluctuations in KSTAR Garcia, O. E.; Kube, R.; Theodorsen, A. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.11.008	journal	August 2017
Fast imaging of filaments in the X-point region of Alcator C-Mod Terry, J. L.; Ballinger, S.; Brunner, D. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.11.020	journal	August 2017
Recent theoretical progress in understanding coherent structures in edge and SOL turbulence Krasheninnikov, S. I.; D'Ippolito, D. A.; Myra, J. R. Journal of Plasma Physics, Vol. 74, Issue 5 https://doi.org/10.1017/S0022377807006940	journal	October 2008
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
Observations of the turbulence in the scrape-off-layer of Alcator C-Mod and comparisons with simulation Terry, J. L.; Zweben, S. J.; Hallatschek, K. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1564090	journal	May 2003
The poloidal distribution of turbulent fluctuations in the Mega-Ampère Spherical Tokamak Antar, G. Y.; Counsell, G.; Ahn, J. -W. Physics of Plasmas, Vol. 12, Issue 3 https://doi.org/10.1063/1.1861894	journal	March 2005
Edge instability regimes with applications to blob transport and the quasicoherent mode Myra, J. R.; D’Ippolito, D. A. Physics of Plasmas, Vol. 12, Issue 9 https://doi.org/10.1063/1.2048847	journal	September 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
High density Langmuir probe array for NSTX scrape-off layer measurements under lithiated divertor conditions Kallman, J.; Jaworski, M. A.; Kaita, R. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3494381	journal	October 2010
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
Radial resolution enhancement of the NSTX Thomson scattering diagnostic LeBlanc, B. P.; Diallo, A.; Labik, G. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4738655	journal	October 2012
Full toroidal imaging of non-axisymmetric plasma material interaction in the National Spherical Torus Experiment divertor Scotti, Filippo; Roquemore, A. L.; Soukhanovskii, V. A. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4739510	journal	October 2012
Direct observations of L-I-H and H-I-L transitions with the X-point reciprocating probe in ASDEX Upgrade Müller, S. H.; Conway, G. D.; Birkenmeier, G. Physics of Plasmas, Vol. 21, Issue 4 https://doi.org/10.1063/1.4870012	journal	April 2014
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
The appearance and propagation of filaments in the private flux region in Mega Amp Spherical Tokamak Harrison, J. R.; Fishpool, G. M.; Thornton, A. J. Physics of Plasmas, Vol. 22, Issue 9 https://doi.org/10.1063/1.4929924	journal	September 2015
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices Zweben, S. J.; Terry, J. L.; Stotler, D. P. Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4981873	journal	April 2017
Two-dimensional turbulence cross-correlation functions in the edge of NSTX Zweben, S. J.; Stotler, D. P.; Scotti, F. Physics of Plasmas, Vol. 24, Issue 10 https://doi.org/10.1063/1.5002695	journal	October 2017
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
Penetration of filamentary structures into the divertor region of spherical tokamaks Baver, D. A.; Myra, J. R. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5065390	journal	February 2019
Effect of the magnetic field geometry on the flute-like perturbations near the divertor X point Farina, D.; Pozzoli, R.; Ryutov, D. D. Nuclear Fusion, Vol. 33, Issue 9 https://doi.org/10.1088/0029-5515/33/9/I06	journal	September 1993
High-speed imaging of edge turbulence in NSTX Zweben, S. J.; Maqueda, R. J.; Stotler, D. P. Nuclear Fusion, Vol. 44, Issue 1 https://doi.org/10.1088/0029-5515/44/1/016	journal	December 2003
Intermittent divertor filaments in the National Spherical Torus Experiment and their relation to midplane blobs Maqueda, R. J.; Stotler, D. P. Nuclear Fusion, Vol. 50, Issue 7 https://doi.org/10.1088/0029-5515/50/7/075002	journal	June 2010
Latest investigations on fluctuations, ELM filaments and turbulent transport in the SOL of ASDEX Upgrade Müller, H. W.; Adamek, J.; Cavazzana, R. Nuclear Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0029-5515/51/7/073023	journal	June 2011
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
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
Experimental investigation of the parallel structure of fluctuations in the scrape-off layer of Alcator C-Mod Grulke, O.; Terry, J. L.; Cziegler, I. Nuclear Fusion, Vol. 54, Issue 4 https://doi.org/10.1088/0029-5515/54/4/043012	journal	March 2014
Edge and SOL turbulence and blob variations over a large database in NSTX Zweben, S. J.; Davis, W. M.; Kaye, S. M. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093035	journal	September 2015
Fluctuation-driven transport in the DIII-D boundary Rudakov, D. L.; Boedo, J. A.; Moyer, R. A. Plasma Physics and Controlled Fusion, Vol. 44, Issue 6 https://doi.org/10.1088/0741-3335/44/6/308	journal	May 2002
Self-similar density turbulence in the TCV tokamak scrape-off layer Graves, J. P.; Horacek, J.; Pitts, R. A. Plasma Physics and Controlled Fusion, Vol. 47, Issue 3 https://doi.org/10.1088/0741-3335/47/3/L01	journal	February 2005
Interchange turbulence in the TCV scrape-off layer Garcia, O. E.; Horacek, J.; Pitts, R. A. Plasma Physics and Controlled Fusion, Vol. 48, Issue 1 https://doi.org/10.1088/0741-3335/48/1/L01	journal	December 2005
Filament structures at the plasma edge on MAST Kirk, A.; Ayed, N. Ben; Counsell, G. Plasma Physics and Controlled Fusion, Vol. 48, Issue 12B https://doi.org/10.1088/0741-3335/48/12B/S41	journal	November 2006
Statistical properties of electrostatic turbulence in toroidal magnetized plasmas Labit, B.; Diallo, A.; Fasoli, A. Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B https://doi.org/10.1088/0741-3335/49/12B/S26	journal	November 2007
Blob structure and motion in the edge and SOL of NSTX Zweben, S. J.; Myra, J. R.; Davis, W. M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4, Article No. 044007 https://doi.org/10.1088/0741-3335/58/4/044007	journal	January 2016
Intermittent electron density and temperature fluctuations and associated fluxes in the Alcator C-Mod scrape-off layer Kube, R.; Garcia, O. E.; Theodorsen, A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1361-6587/aab726	journal	April 2018
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
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
Divertor leg filaments in NSTX-U Scotti, Filippo; Zweben, Stewart; Soukhanovskii, Vlad Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae49f	journal	October 2018
Tomographic reconstruction of tokamak edge turbulence from single visible camera data and automatic turbulence structure tracking Cavalier, Jordan; Lemoine, Nicolas; Brochard, Frederic Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0d4c	journal	April 2019
Stochastic Modeling of Intermittent Scrape-Off Layer Plasma Fluctuations Garcia, O. E. Physical Review Letters, Vol. 108, Issue 26 https://doi.org/10.1103/PhysRevLett.108.265001	journal	June 2012
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
X -Point Effect on Plasma Blob Dynamics Avino, F.; Fasoli, A.; Furno, I. Physical Review Letters, Vol. 116, Issue 10 https://doi.org/10.1103/PhysRevLett.116.105001	journal	March 2016
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
SOL width and intermittent fluctuations in KSTAR Garcia, O. E.; Kube, R.; Theodorsen, A. arXiv https://doi.org/10.48550/arxiv.1611.03440	preprint	January 2016
Intermittent electron density and temperature fluctuations and associated fluxes in the Alcator C-Mod scrape-off layer Kube, Ralph; Garcia, Odd Erik; Theodorsen, Audun arXiv https://doi.org/10.48550/arxiv.1803.05172	text	January 2018
Penetration Of Filamentary Structures Into The Divertor Region Of Spherical Tokamaks Baver, Derek A.; Myra, James R. Zenodo https://doi.org/10.5281/zenodo.1453440	text	January 2018

Similar Records

Intermittent Divertor Filaments in the National Spherical Torus Experiment and Their Relation to Midplane Blobs

Technical Report · Wed May 19 00:00:00 EDT 2010 · OSTI ID:981708

Divertor leg filaments in NSTX-U

Journal Article · Wed Oct 24 00:00:00 EDT 2018 · Nuclear Fusion · OSTI ID:1485055

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX

Citation Formats

References (51)

Similar Records

Related Subjects