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.; Brunner, D.; LaBombard, B.; Terry, J. L.

doi:10.1017/s0022377820001282

Title: Comparison between mirror Langmuir probe and gas-puff imaging measurements of intermittent fluctuations in the Alcator C-Mod scrape-off layer

Journal Article · Fri Oct 30 00:00:00 EDT 2020 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377820001282· OSTI ID:1737827

^[1]; Theodorsen, A. ^[2]; Garcia, O. E. ^[2]; Brunner, D. ^[3]; LaBombard, B. ^[3]; Terry, J. L. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
UiT The Arctic Univ. of Norway, Tromsø (Norway)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Statistical properties of the scrape-off layer plasma fluctuations are studied in ohmically heated plasmas in the Alcator C-Mod tokamak. For the first time, plasma fluctuations as well as parameters that describe the fluctuations are compared across measurements from a mirror Langmuir probe (MLP) and from gas-puff imaging (GPI) that sample the same plasma discharge. This comparison is complemented by an analysis of line emission time-series data, synthesized from the MLP electron density and temperature measurements. The fluctuations observed by the MLP and GPI typically display relative fluctuation amplitudes of order unity together with positively skewed and flattened probability density functions. Such data time series are well described by an established stochastic framework that models the data as a superposition of uncorrelated, two-sided exponential pulses. The most important parameter of the process is the intermittency parameter, $$γ=τ_d/τ_w$$, where τd denotes the duration time of a single pulse and $$τ_w$$ gives the average waiting time between consecutive pulses. In this study we show, using a new deconvolution method, that these parameters can be consistently estimated from different statistics of the data. We also show that the statistical properties of the data sampled by the MLP and GPI diagnostic are very similar. Finally, a synthetic GPI signal using only plasma parameters sampled by the MLP shows qualitatively different fluctuation statistics from the measured GPI signal.

View Accepted Manuscript (DOE)

Cite

Export

Save

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

Sponsoring Organization:: USDOE Office of Science (SC); Research Council of Norway

Grant/Contract Number:: FC02-99ER54512; 240510/F20

OSTI ID:: 1737827

Journal Information:: Journal of Plasma Physics, Vol. 86, Issue 5; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

References (56)

Transport-driven Scrape-Off-Layer flows and the boundary conditions imposed at the magnetic separatrix in a tokamak plasma LaBombard, B.; Rice, J. E.; Hubbard, A. E. Nuclear Fusion, Vol. 44, Issue 10 https://doi.org/10.1088/0029-5515/44/10/001	journal	September 2004
Hybrid time dependent/independent solution for the He I line ratio temperature and density diagnostic for a thermal helium beam with applications in the scrape-off layer-edge regions in tokamaks Muñoz Burgos, J. M.; Schmitz, O.; Loch, S. D. Physics of Plasmas, Vol. 19, Issue 1 https://doi.org/10.1063/1.3672230	journal	January 2012
Comparison of 3D flux-driven scrape-off layer turbulence simulations with gas-puff imaging of Alcator C-Mod inner-wall limited discharges Halpern, F. D.; Terry, J. L.; Zweben, S. J. Plasma Physics and Controlled Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/0741-3335/57/5/054005	journal	April 2015
Edge turbulence imaging in the Alcator C-Mod tokamak Zweben, S. J.; Stotler, D. P.; Terry, J. L. Physics of Plasmas, Vol. 9, Issue 5 https://doi.org/10.1063/1.1445179	journal	May 2002
Reconstruction of current profile parameters and plasma shapes in tokamaks Lao, L. L.; St. John, H.; Stambaugh, R. D. Nuclear Fusion, Vol. 25, Issue 11 https://doi.org/10.1088/0029-5515/25/11/007	journal	November 1985
Visible imaging of turbulence in the SOL of the Alcator C-Mod tokamak Terry, J. L.; Maqueda, R.; Pitcher, C. S. Journal of Nuclear Materials, Vol. 290-293 https://doi.org/10.1016/S0022-3115(00)00453-0	journal	March 2001
The influence of blobs on neutral particles in the scrape-off layer Thrysøe, Alexander S.; Tophøj, Laust E. H.; Naulin, Volker Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044010	journal	March 2016
Plasma fluctuations in the scrape-off layer and at the divertor target in Alcator C-Mod and their relationship to divertor collisionality and density shoulder formation Kuang, A. Q.; LaBombard, B.; Brunner, D. Nuclear Materials and Energy, Vol. 19 https://doi.org/10.1016/j.nme.2019.02.038	journal	May 2019
Fluctuations and transport in the TCV scrape-off layer Garcia, O. E.; Horacek, J.; Pitts, R. A. Nuclear Fusion, Vol. 47, Issue 7 https://doi.org/10.1088/0029-5515/47/7/017	journal	June 2007
Overview of edge electrostatic turbulence experiments on TCV Horacek, J.; Pitts, R. A.; Graves, J. P. Czechoslovak Journal of Physics, Vol. 55, Issue 3 https://doi.org/10.1007/s10582-005-0040-z	journal	March 2005
Burst statistics in Alcator C-Mod SOL turbulence Garcia, O. E.; Cziegler, I.; Kube, R. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.054	journal	July 2013
Intermittent fluctuations in the Alcator C-Mod scrape-off layer Garcia, O. E.; Fritzner, S. M.; Kube, R. Physics of Plasmas, Vol. 20, Issue 5 https://doi.org/10.1063/1.4802942	journal	May 2013
Richardson-Lucy Deblurring for Scenes under a Projective Motion Path IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 33, Issue 8 https://doi.org/10.1109/TPAMI.2010.222	journal	August 2011
Density limits in toroidal plasmas Greenwald, Martin Plasma Physics and Controlled Fusion, Vol. 44, Issue 8 https://doi.org/10.1088/0741-3335/44/8/201	journal	July 2002
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
An experimental investigation of the high density transition of the scrape-off layer transport in ASDEX Upgrade Carralero, D.; Birkenmeier, G.; Müller, H. W. Nuclear Fusion, Vol. 54, Issue 12 https://doi.org/10.1088/0029-5515/54/12/123005	journal	November 2014
Intermittent transport in the plasma periphery of the T-10 tokamak Kirnev, G. S.; Budaev, V. P.; Grashin, S. A. Plasma Physics and Controlled Fusion, Vol. 46, Issue 4 https://doi.org/10.1088/0741-3335/46/4/004	journal	March 2004
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
Relationship between frequency power spectra and intermittent, large-amplitude bursts in the Alcator C-Mod scrape-off layer Theodorsen, A.; Garcia, O. E.; Kube, R. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7e4c	journal	August 2017
Scrape-off layer turbulence in TCV: evidence in support of stochastic modelling Theodorsen, A.; Garcia, O. E.; Horacek, J. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/0741-3335/58/4/044006	journal	January 2016
Neutral Gas Transport Modeling with DEGAS 2 Stotler, Daren; Karney, Charles Contributions to Plasma Physics, Vol. 34, Issue 2-3 https://doi.org/10.1002/ctpp.2150340246	journal	January 1994
Statistical properties of the plasma fluctuations and turbulent cross-field fluxes in the outboard mid-plane scrape-off layer of Alcator C-Mod Kube, R.; Garcia, O. E.; Theodorsen, A. Nuclear Materials and Energy, Vol. 18 https://doi.org/10.1016/j.nme.2018.11.021	journal	January 2019
Stochastic modelling of intermittent fluctuations in the scrape-off layer: Correlations, distributions, level crossings, and moment estimation Garcia, O. E.; Kube, R.; Theodorsen, A. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4951016	journal	May 2016
Auto-correlation function and frequency spectrum due to a super-position of uncorrelated exponential pulses Garcia, O. E.; Theodorsen, A. Physics of Plasmas, Vol. 24, Issue 3 https://doi.org/10.1063/1.4978955	journal	March 2017
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
Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer Theodorsen, A.; Garcia, O. E.; Kube, R. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5064744	journal	December 2018
Experimental studies of edge turbulence and confinement in Alcator C-Mod Cziegler, I.; Terry, J. L.; Hughes, J. W. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3421577	journal	May 2010
Intermittent fluctuations in the TCV scrape-off layer Garcia, O. E.; Horacek, J.; Pitts, R. A. Nuclear Fusion, Vol. 55, Issue 6 https://doi.org/10.1088/0029-5515/55/6/062002	journal	May 2015
An Iterative Image Space Reconstruction Algorthm Suitable for Volume ECT Daube-Witherspoon, Margaret E.; Muehllehner, Gerd IEEE Transactions on Medical Imaging, Vol. 5, Issue 2 https://doi.org/10.1109/TMI.1986.4307748	journal	June 1986
Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes Griener, M.; Schmitz, O.; Bald, K. Review of Scientific Instruments, Vol. 88, Issue 3 https://doi.org/10.1063/1.4978629	journal	March 2017
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
Impact of neutral density fluctuations on gas puff imaging diagnostics Wersal, C.; Ricci, P. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7db0	journal	August 2017
Statistical analysis of the ion flux to the JET outer wall Walkden, N. R.; Wynn, A.; Militello, F. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa515a	journal	January 2017
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
Statistical properties of a filtered Poisson process with additive random noise: distributions, correlations and moment estimation Theodorsen, A.; Garcia, O. E.; Rypdal, M. Physica Scripta, Vol. 92, Issue 5 https://doi.org/10.1088/1402-4896/aa694c	journal	April 2017
Fluctuation statistics in the scrape-off layer of Alcator C-Mod Kube, R.; Theodorsen, A.; Garcia, O. E. Plasma Physics and Controlled Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/0741-3335/58/5/054001	journal	March 2016
Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak D. Brunner, A. Q. Kuang Harvard Dataverse https://doi.org/10.7910/dvn/i5sqmy	dataset	January 2018
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
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
A Model-Based Deconvolution Approach to Solve Fiber Crossing in Diffusion-Weighted MR Imaging Dell'Acqua, Flavio; Rizzo, Giovanna; Scifo, Paola IEEE Transactions on Biomedical Engineering, Vol. 54, Issue 3 https://doi.org/10.1109/TBME.2006.888830	journal	March 2007
Qualification and implementation of line ratio spectroscopy on helium as plasma edge diagnostic at ASDEX Upgrade Griener, M.; Burgos, J. M. Muñoz; Cavedon, M. Plasma Physics and Controlled Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1361-6587/aa97e8	journal	December 2017
Experimental investigation of transport phenomena in the scrape-off layer and divertor LaBombard, B. Journal of Nuclear Materials, Vol. 241-243, Issue 1 https://doi.org/10.1016/S0022-3115(96)00502-8	journal	February 1997
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
Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod LaBombard, B.; Boivin, R. L.; Greenwald, M. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1352596	journal	May 2001
New insights on boundary plasma turbulence and the quasi-coherent mode in Alcator C-Mod using a Mirror Langmuir Probe LaBombard, B.; Golfinopoulos, T.; Terry, J. L. Physics of Plasmas, Vol. 21, Issue 5 https://doi.org/10.1063/1.4873918	journal	May 2014
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
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
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
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
Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak Brunner, D.; Kuang, A. Q.; LaBombard, B. Review of Scientific Instruments, Vol. 88, Issue 7 https://doi.org/10.1063/1.4990043	journal	July 2017
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
Mirror Langmuir probe: A technique for real-time measurement of magnetized plasma conditions using a single Langmuir electrode LaBombard, B.; Lyons, L. Review of Scientific Instruments, Vol. 78, Issue 7 https://doi.org/10.1063/1.2754392	journal	July 2007
Statistical features of coherent structures at increasing magnetic field pitch investigated using fast imaging in QUEST Banerjee, Santanu; Zushi, H.; Nishino, N. Nuclear Fusion, Vol. 52, Issue 12 https://doi.org/10.1088/0029-5515/52/12/123016	journal	November 2012
Neutral transport simulations of gas puff imaging experiments Stotler, D.; Labombard, B.; Terry, J. Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/S0022-3115(02)01495-2	journal	March 2003
An iterative technique for the rectification of observed distributions Lucy, L. B. The Astronomical Journal, Vol. 79 https://doi.org/10.1086/111605	journal	June 1974
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

Similar Records

Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer

Journal Article · Tue Dec 18 00:00:00 EST 2018 · Physics of Plasmas · OSTI ID:1737827

Theodorsen, A.; Garcia, O. E.; Kube, R.; +2 more

Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod

Dataset · Tue Oct 16 00:00:00 EDT 2018 · OSTI ID:1737827

Russell, D. A.; Myra, J. R.; D’Ippolito, D. A.; +4 more

Mean flows and blob velocities in scrape-off layer (SOLT) simulations of an L-mode discharge on Alcator C-Mod

Journal Article · Fri Jun 10 00:00:00 EDT 2016 · Physics of Plasmas · OSTI ID:1737827

Russell, D. A.; Myra, J. R.; D'Ippolito, D. A.; +4 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
fusion plasma
plasma diagnostics

Title: Comparison between mirror Langmuir probe and gas-puff imaging measurements of intermittent fluctuations in the Alcator C-Mod scrape-off layer

Citation Formats

References (56)

Similar Records

Related Subjects