Correlation between the relative blob fraction and plasma parameters in NSTX

Zweben, S. J.; Banerjee, S.; Bisai, N.; Diallo, A.; Lampert, M.; LeBlanc, B.; Myra, J. R.; Russell, D. A.

doi:10.1063/5.0074261

Title: Correlation between the relative blob fraction and plasma parameters in NSTX

Journal Article · 18 January 2022 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0074261 · OSTI ID:1886887

^[1];

^[2];

^[1];

^[1]; LeBlanc, B. ^[1];

^[3];

^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Institute for Plasma Research (India); Homi Bhabha National Institute (HBNI) (India)
Lodestar Research Corporation, Boulder, CO (United States)

Here, we present a simple analysis of the fraction of blobs observed in the scrape-off layer of NSTX and calculates the correlation between this blob fraction and various plasma parameters. The measurements were made using the gas puff imaging (GPI) diagnostic on a database of 103 shots from 2010 with neutral beam power P_NBI = 0–6 MW. The blob fraction ranged from f_b = 0.1% to 4.8%, where f_b is defined as the fraction of time the GPI signal was larger than three times its average value within 0–7.5 cm outside the separatrix. The blob fraction generally decreased with increasing neutral beam injection power and was lower on average in H-mode plasmas than Ohmic and L-mode plasmas. The blob fraction had its highest correlation with the measured poloidal turbulence velocity and its radial gradient just inside the separatrix. This is in part consistent with a model in which the blob generation rate increases with the poloidal velocity shear.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

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

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

OSTI ID:: 1886887

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

References (49)

Correlation between the relative blob fraction and plasma parameters in NSTX Zweben, S.; Banerjee, S.; Bisai, N. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1888270	dataset	January 2022
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
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
Transport by intermittency in the boundary of the DIII-D tokamak Boedo, J. A.; Rudakov, D. L.; Moyer, R. A. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1563259	journal	May 2003
Dynamics of blobs in scrape-off-layer/shadow regions of tokamaks and linear devices Yu, G. Q.; Krasheninnikov, S. I. Physics of Plasmas, Vol. 10, Issue 11 https://doi.org/10.1063/1.1616937	journal	November 2003
Formation of a density blob and its dynamics in the edge and the scrape-off layer of a tokamak plasma Bisai, N.; Das, A.; Deshpande, S. Physics of Plasmas, Vol. 12, Issue 10 https://doi.org/10.1063/1.2083791	journal	October 2005
Blob birth and transport in the tokamak edge plasma: Analysis of imaging data Myra, J. R.; D’Ippolito, D. A.; Stotler, D. P. Physics of Plasmas, Vol. 13, Issue 9 https://doi.org/10.1063/1.2355668	journal	September 2006
Study of statistical properties of edge turbulence in the National Spherical Torus Experiment with the gas puff imaging diagnostic Agostini, M.; Zweben, S. J.; Cavazzana, R. Physics of Plasmas, Vol. 14, Issue 10 https://doi.org/10.1063/1.2776912	journal	October 2007
Comparative analysis of intermittent burst temporal characteristics at the edge of the CASTOR and Tore Supra tokamaks Nanobashvili, I.; Devynck, P.; Gunn, J. P. Physics of Plasmas, Vol. 16, Issue 2 https://doi.org/10.1063/1.3074787	journal	February 2009
Reduced model simulations of the scrape-off-layer heat-flux width and comparison with experiment Myra, J. R.; Russell, D. A.; D’Ippolito, D. A. Physics of Plasmas, Vol. 18, Issue 1 https://doi.org/10.1063/1.3526676	journal	January 2011
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
Level crossings, excess times, and transient plasma–wall interactions in fusion plasmas Theodorsen, A.; Garcia, O. E. Physics of Plasmas, Vol. 23, Issue 4 https://doi.org/10.1063/1.4947235	journal	April 2016
Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod Russell, D. A.; Myra, J. R.; D'Ippolito, D. A. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4953419	journal	June 2016
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
Estimation of the plasma blob occurrence rate Häcker, R.; Fuchert, G.; Carralero, D. Physics of Plasmas, Vol. 25, Issue 1 https://doi.org/10.1063/1.5008301	journal	January 2018
A two-dimensional statistical framework connecting thermodynamic profiles with filaments in the scrape off layer and application to experiments Militello, F.; Farley, T.; Mukhi, K. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017919	journal	May 2018
Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas Garcia, O. E.; Kube, R.; Theodorsen, A. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5018709	journal	May 2018
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
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
A universal mechanism for plasma blob formation Bisai, N.; Banerjee, Santanu; Sen, Abhijit Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5082241	journal	February 2019
Filament identification in wide-angle high speed imaging of the mega amp spherical tokamak Farley, T.; Walkden, N. R.; Militello, F. Review of Scientific Instruments, Vol. 90, Issue 9 https://doi.org/10.1063/1.5109470	journal	September 2019
Continuum electromagnetic gyrokinetic simulations of turbulence in the tokamak scrape-off layer and laboratory devices Hakim, Ammar H.; Mandell, Noah R.; Bernard, T. N. Physics of Plasmas, Vol. 27, Issue 4 https://doi.org/10.1063/1.5141157	journal	April 2020
MHD-blob correlations in NSTX Zweben, S. J.; Fredrickson, E. D.; Myra, J. R. Physics of Plasmas, Vol. 27, Issue 5 https://doi.org/10.1063/5.0006515	journal	May 2020
Comparison of edge turbulence characteristics between DIII-D and C-Mod simulations with XGC1 Keramidas Charidakos, I.; Myra, J. R.; Ku, S. Physics of Plasmas, Vol. 27, Issue 7 https://doi.org/10.1063/5.0008755	journal	July 2020
Effects of nitrogen seeding in a tokamak plasma Raj, Shrish; Bisai, N.; Shankar, Vijay Physics of Plasmas, Vol. 27, Issue 12 https://doi.org/10.1063/5.0015647	journal	December 2020
Blob interactions in 2D scrape-off layer simulations Decristoforo, G.; Militello, F.; Nicholas, T. Physics of Plasmas, Vol. 27, Issue 12 https://doi.org/10.1063/5.0021314	journal	December 2020
Edge turbulence velocity preceding the L-H transition in NSTX Zweben, S. J.; Diallo, A.; Lampert, M. Physics of Plasmas, Vol. 28, Issue 3 https://doi.org/10.1063/5.0039153	journal	March 2021
Numerical turbulence simulations of intermittent fluctuations in the scrape-off layer of magnetized plasmas Decristoforo, G.; Theodorsen, A.; Omotani, J. Physics of Plasmas, Vol. 28, Issue 7 https://doi.org/10.1063/5.0047566	journal	July 2021
Reduced-model scrape-off layer turbulence (nSOLT) simulations comparing three fueling scenarios Russell, D. A.; Myra, J. R.; Militello, F. Physics of Plasmas, Vol. 28, Issue 9 https://doi.org/10.1063/5.0060524	journal	September 2021
Initial plasma results from the Electric Tokamak* Taylor, R. J.; Gauvreau, J. -L; Gilmore, M. Nuclear Fusion, Vol. 42, Issue 1 https://doi.org/10.1088/0029-5515/42/1/307	journal	January 2002
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
Scrape off layer profiles interpreted with filament dynamics Militello, F.; Omotani, J. T. Nuclear Fusion, Vol. 56, Issue 10 https://doi.org/10.1088/0029-5515/56/10/104004	journal	August 2016
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
Turbulence during H- and L-mode plasmas in the scrape-off layer of the ASDEX Upgrade tokamak Antar, G. Y.; Tsalas, M.; Wolfrum, E. Plasma Physics and Controlled Fusion, Vol. 50, Issue 9 https://doi.org/10.1088/0741-3335/50/9/095012	journal	July 2008
Blob dynamics in the TORPEX experiment: a multi-code validation Riva, F.; Colin, C.; Denis, J. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044005	journal	January 2016
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
Towards a quantitative prediction of the blob detection rate Fuchert, G.; Carralero, D.; Manz, P. Plasma Physics and Controlled Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/0741-3335/58/5/054006	journal	April 2016
L-mode filament characteristics on MAST as a function of plasma current measured using visible imaging Kirk, A.; Thornton, A. J.; Harrison, J. R. Plasma Physics and Controlled Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/0741-3335/58/8/085008	journal	July 2016
Interpretation of scrape-off layer profile evolution and first-wall ion flux statistics on JET using a stochastic framework based on fillamentary motion Walkden, N. R.; Wynn, A.; Militello, F. Plasma Physics and Controlled Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1361-6587/aa7365	journal	June 2017
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
Simulations of tokamak boundary plasma turbulence transport in setting the divertor heat flux width Xu, X. Q.; Li, N. M.; Li, Z. Y. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab430d	journal	October 2019
Finite electron temperature gradient effects on blob formation in the scrape-off layer of a tokamak plasma Shankar, Vijay; Bisai, N.; Raj, Shrish Nuclear Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1741-4326/abeed7	journal	April 2021
Experimental validation of universal plasma blob formation mechanism Bisai, N.; Banerjee, Santanu; Zweben, S. J. Nuclear Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1741-4326/ac3f1a	journal	January 2022
Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak Wang, Chenyu; Nie, Lin; Tang, Guixin Plasma Science and Technology, Vol. 23, Issue 5 https://doi.org/10.1088/2058-6272/abed2c	journal	April 2021
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
Correlation between the relative blob fraction and plasma parameters in NSTX Zweben, S.; Banerjee, S.; Bisai, N. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1888270	dataset	January 2022

Cited By (2)

Correlation between the relative blob fraction and plasma parameters in NSTX Zweben, S.; Banerjee, S.; Bisai, N. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1888270	dataset	January 2022
Correlation between the relative blob fraction and plasma parameters in NSTX Zweben, S.; Banerjee, S.; Bisai, N. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States) https://doi.org/10.11578/1888270	dataset	January 2022

Similar Records

Blob wakes in NSTX

Journal Article · 2019 · Physics of Plasmas · OSTI ID:1558756

Zweben, S. J.; Myra, J. R.; Diallo, A.; +3 more

Blob wakes in NSTX

Dataset · 2019 · OSTI ID:1562095

Temporal structure of blobs in NSTX

Journal Article · 2022 · Physics of Plasmas · OSTI ID:1881313

Zweben, Stewart J.; Lampert, Mate; Myra, James R.

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
plasma confinement
tokamaks

Title: Correlation between the relative blob fraction and plasma parameters in NSTX

Citation Formats

References (49)

Cited By (2)

Similar Records

Related Subjects