Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D

Diallo, A.; Groebner, R. J.; Rhodes, T. L.; Battaglia, D. J.; Smith, D. R.; Osborne, T. H.; Canik, J. M.; Guttenfelder, W.; Snyder, P. B.

doi:10.1063/1.4921148

Title: Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921148· OSTI ID:1257720

Diallo, A. ^[1]; Groebner, R. J. ^[2]; Rhodes, T. L. ^[3]; Battaglia, D. J. ^[1]; Smith, D. R. ^[4]; Osborne, T. H. ^[2]; Canik, J. M. ^[5];

^[1]; Snyder, P. B. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Physics and Astronomy Dept., Los Angeles, CA (United States)
Department of Engineering Physics, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Direct measurements of the pedestal recovery during an edge-localized mode cycle provide evidence that quasi-coherent fluctuations (QCFs) play a role in the inter-ELM pedestal dynamics. Using fast Thomson scattering measurements, the pedestal density and temperature evolutions are probed on sub-millisecond time scales to show a fast recovery of the density gradient compared to the temperature gradient. The temperature gradient appears to provide a drive for the onset of quasi-coherent fluctuations (as measured with the magnetic probe and the density diagnostics) localized in the pedestal. The amplitude evolution of these QCFs tracks the temperature gradient evolution including its saturation. Such correlation suggests that these QCFs play a key role in limiting the pedestal temperature gradient. The saturation of the QCFs coincides with the pressure gradient reaching the kinetic-ballooning mode (KBM) critical gradient as predicted by EPED1. Furthermore, linear microinstability analysis using GS2 indicates that the steep gradient is near the KBM threshold. Furthermore, the modeling and the observations together suggest that QCFs are consistent with dominant KBMs (although microtearing cannot be excluded as subdominant).

View Accepted Manuscript (DOE)

View Accepted Manuscript (Publisher)

Cite

Export

Save

Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1257720

Alternate ID(s):: OSTI ID: 1228241; OSTI ID: 1350064

Report Number(s):: PPPL-5096; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 63 works

Citation information provided by
Web of Science

References (42)

Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX Wagner, F.; Fussmann, G.; Grave, T. Physical Review Letters, Vol. 53, Issue 15 https://doi.org/10.1103/PhysRevLett.53.1453	journal	October 1984
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices Burrell, K. H. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872367	journal	May 1997
ITER predictions using the GYRO verified and experimentally validated trapped gyro-Landau fluid transport model Kinsey, J. E.; Staebler, G. M.; Candy, J. Nuclear Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0029-5515/51/8/083001	journal	June 2011
Edge-localized-modes in tokamaks Leonard, A. W. Physics of Plasmas, Vol. 21, Issue 9 https://doi.org/10.1063/1.4894742	journal	September 2014
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model Snyder, P. B.; Groebner, R. J.; Hughes, J. W. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103016	journal	August 2011
Development and validation of a predictive model for the pedestal height Snyder, P. B.; Groebner, R. J.; Leonard, A. W. Physics of Plasmas, Vol. 16, Issue 5 https://doi.org/10.1063/1.3122146	journal	May 2009
Global and pedestal confinement in JET with a Be/W metallic wall Beurskens, M. N. A.; Frassinetti, L.; Challis, C. Nuclear Fusion, Vol. 54, Issue 4 https://doi.org/10.1088/0029-5515/54/4/043001	journal	March 2014
The H-mode pedestal structure and its role on confinement in JET with a carbon and metal wall Leyland, M. J.; Beurskens, M. N. A.; Frassinetti, L. Nuclear Fusion, Vol. 55, Issue 1 https://doi.org/10.1088/0029-5515/55/1/013019	journal	December 2014
Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER Groebner, R. J.; Chang, C. S.; Hughes, J. W. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093024	journal	August 2013
Characterization of the pedestal in Alcator C-Mod ELMing H-modes and comparison with the EPED model Walk, J. R.; Snyder, P. B.; Hughes, J. W. Nuclear Fusion, Vol. 52, Issue 6 https://doi.org/10.1088/0029-5515/52/6/063011	journal	April 2012
Pedestal structure and stability in H-mode and I-mode: a comparative study on Alcator C-Mod Hughes, J. W.; Snyder, P. B.; Walk, J. R. Nuclear Fusion, Vol. 53, Issue 4 https://doi.org/10.1088/0029-5515/53/4/043016	journal	March 2013
The EPED pedestal model and edge localized mode-suppressed regimes: Studies of quiescent H-mode and development of a model for edge localized mode suppression via resonant magnetic perturbations Snyder, P. B.; Osborne, T. H.; Burrell, K. H. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.3699623	journal	May 2012
Pedestal stability comparison and ITER pedestal prediction Snyder, P. B.; Aiba, N.; Beurskens, M. Nuclear Fusion, Vol. 49, Issue 8 https://doi.org/10.1088/0029-5515/49/8/085035	journal	July 2009
Temporal evolution of H-mode pedestal in DIII-D Groebner, R. J.; Osborne, T. H.; Leonard, A. W. Nuclear Fusion, Vol. 49, Issue 4 https://doi.org/10.1088/0029-5515/49/4/045013	journal	March 2009
Dynamical evolution of pedestal parameters in ELMy H-mode in the National Spherical Torus Experiment Diallo, A.; Maingi, R.; Kubota, S. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103031	journal	September 2011
Inter-ELM behaviour of the electron density and temperature pedestal in ASDEX Upgrade Burckhart, A.; Wolfrum, E.; Fischer, R. Plasma Physics and Controlled Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0741-3335/52/10/105010	journal	September 2010
A comparison of H-mode pedestal characteristics in MAST as a function of magnetic configuration and ELM type Kirk, A.; O'Gorman, T.; Saarelma, S. Plasma Physics and Controlled Fusion, Vol. 51, Issue 6 https://doi.org/10.1088/0741-3335/51/6/065016	journal	May 2009
Quiescent H-Mode Plasmas with Strong Edge Rotation in the Cocurrent Direction Burrell, K. H.; Osborne, T. H.; Snyder, P. B. Physical Review Letters, Vol. 102, Issue 15 https://doi.org/10.1103/PhysRevLett.102.155003	journal	April 2009
Pedestal profiles and fluctuations in C-Mod enhanced D-alpha H-modes Hubbard, A. E.; Boivin, R. L.; Granetz, R. S. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1348329	journal	May 2001
I-mode: an H-mode energy confinement regime with L-mode particle transport in Alcator C-Mod Whyte, D. G.; Hubbard, A. E.; Hughes, J. W. Nuclear Fusion, Vol. 50, Issue 10 https://doi.org/10.1088/0029-5515/50/10/105005	journal	August 2010
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
Initial results of the high resolution edge Thomson scattering upgrade at DIII-D Eldon, D.; Bray, B. D.; Deterly, T. M. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4738656	journal	October 2012
Edge stability of stationary ELM-suppressed regimes on DIII-D Osborne, T. H.; Snyder, P. B.; Burrell, K. H. Journal of Physics: Conference Series, Vol. 123 https://doi.org/10.1088/1742-6596/123/1/012014	journal	July 2008
Edge impurity dynamics during an edge-localized mode cycle on DIII-D Wade, M. R.; Burrell, K. H.; Hogan, J. T. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1891745	journal	May 2005
ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D Solomon, W. M.; Burrell, K. H.; Garofalo, A. M. Nuclear Fusion, Vol. 52, Issue 3 https://doi.org/10.1088/0029-5515/52/3/033007	journal	March 2012
Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas Diallo, A.; Hughes, J. W.; Greenwald, M. Physical Review Letters, Vol. 112, Issue 11 https://doi.org/10.1103/PhysRevLett.112.115001	journal	March 2014
Characteristics of a new class of transport-related MHD modes in JET H-mode plasmas Smeulders, P.; Conway, G. D.; Alper, B. Plasma Physics and Controlled Fusion, Vol. 41, Issue 10 https://doi.org/10.1088/0741-3335/41/10/307	journal	September 1999
Washboard modes as ELM-related events in JET Perez, C. P.; Koslowski, H. R.; Hender, T. C. Plasma Physics and Controlled Fusion, Vol. 46, Issue 1 https://doi.org/10.1088/0741-3335/46/1/005	journal	November 2003
High-Frequency Coherent Edge Fluctuations in a High-Pedestal-Pressure Quiescent H-Mode Plasma Yan, Z.; McKee, G. R.; Groebner, R. J. Physical Review Letters, Vol. 107, Issue 5 https://doi.org/10.1103/PhysRevLett.107.055004	journal	July 2011
Pedestal density fluctuation dynamics during the inter-ELM cycle in DIII-D Yan, Z.; McKee, G. R.; Groebner, R. J. Physics of Plasmas, Vol. 18, Issue 5 https://doi.org/10.1063/1.3590936	journal	May 2011
Doppler reflectometry for the investigation of propagating density perturbations Hirsch, M.; Holzhauer, E.; Baldzuhn, J. Plasma Physics and Controlled Fusion, Vol. 43, Issue 12 https://doi.org/10.1088/0741-3335/43/12/302	journal	October 2001
Theoretical and experimental investigation of the phase-runaway in microwave reflectometry Holzhauer, E.; Hirsch, M.; Grossmann, T. Plasma Physics and Controlled Fusion, Vol. 40, Issue 11 https://doi.org/10.1088/0741-3335/40/11/004	journal	November 1998
Comparison of initial value and eigenvalue codes for kinetic toroidal plasma instabilities Kotschenreuther, Mike; Rewoldt, G.; Tang, W. M. Computer Physics Communications, Vol. 88, Issue 2-3 https://doi.org/10.1016/0010-4655(95)00035-E	journal	August 1995
Edge microstability of NSTX plasmas without and with lithium-coated plasma-facing components Canik, J. M.; Guttenfelder, W.; Maingi, R. Nuclear Fusion, Vol. 53, Issue 11 https://doi.org/10.1088/0029-5515/53/11/113016	journal	September 2013
Kinetic Instabilities that Limit $β$ in the Edge of a Tokamak Plasma: A Picture of an $H$ -Mode Pedestal Dickinson, D.; Roach, C. M.; Saarelma, S. Physical Review Letters, Vol. 108, Issue 13 https://doi.org/10.1103/PhysRevLett.108.135002	journal	March 2012
Progress in simulating turbulent electron thermal transport in NSTX Guttenfelder, W.; Peterson, J. L.; Candy, J. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093022	journal	August 2013
Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities Wan, Weigang; Parker, Scott E.; Chen, Yang Physical Review Letters, Vol. 109, Issue 18 https://doi.org/10.1103/PhysRevLett.109.185004	journal	November 2012
Linear gyrokinetic analysis of a DIII-D H-mode pedestal near the ideal ballooning threshold Wang, E.; Xu, X.; Candy, J. Nuclear Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0029-5515/52/10/103015	journal	September 2012
Dynamic plasma-wall modeling of ELMy H-mode with UEDGE-MB-W Pigarov, A. Yu.; Krasheninnikov, S. I.; Rognlien, T. D. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.09.066	journal	August 2015
Velocimetry analysis of type-I edge localized mode precursors in ASDEX Upgrade Manz, P.; Boom, J. E.; Wolfrum, E. Plasma Physics and Controlled Fusion, Vol. 56, Issue 3 https://doi.org/10.1088/0741-3335/56/3/035010	journal	February 2014
Edge pedestal control in quiescent H-mode discharges in DIII-D using co-plus counter-neutral beam injection Burrell, K. H.; Osborne, T. H.; Snyder, P. B. Nuclear Fusion, Vol. 49, Issue 8 https://doi.org/10.1088/0029-5515/49/8/085024	journal	July 2009
Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities Wan, Weigang; Parker, Scott E.; Chen, Yang arXiv https://doi.org/10.48550/arxiv.1203.1571	text	January 2012

Cited By (28)

Observation of quasi-coherent edge fluctuations in Ohmic plasmas on National Spherical Torus Experiment Banerjee, Santanu; Diallo, A.; Zweben, S. J. Physics of Plasmas, Vol. 23, Issue 4 https://doi.org/10.1063/1.4946871	journal	April 2016
Quasi-coherent mode simulation during inter-ELM period in HL-2A Tang, T. F.; Shi, H.; Wang, Z. H. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5050853	journal	December 2018
Long-lived predator-prey dynamics in the pedestal of near-zero torque high performance DIII-D plasmas Barada, K.; Rhodes, T. L.; Burrell, K. H. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5097143	journal	September 2019
Experimental observation of coexisting electromagnetic fluctuations correlating with the inter-ELM pedestal evolution on EAST Lan, H.; Chen, R.; Xu, G. S. Physics of Plasmas, Vol. 26, Issue 12 https://doi.org/10.1063/1.5123734	journal	December 2019
Intermediate- k density and magnetic field fluctuations during inter-ELM pedestal evolution in MAST Hillesheim, J. C.; Dickinson, D.; Roach, C. M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/0741-3335/58/1/014020	journal	November 2015
Effects of density gradients and fluctuations at the plasma edge on ECEI measurements at ASDEX Upgrade Vanovac, B.; Wolfrum, E.; Denk, S. S. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa7ac	journal	February 2018
Flow shear suppression of pedestal ion temperature gradient turbulence-A first principles theoretical framework Hatch, D. R.; Hazeltine, R. D.; Kotschenreuther, M. K. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aac7a7	journal	June 2018
Inter-ELM evolution of the edge current density in JET-ILW type I ELMy H-mode plasmas Horvath, L.; Maggi, C. F.; Casson, F. J. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aac7a9	journal	June 2018
Effect of magnetic shear on edge turbulence in SOL-like open field line configuration in QUEST Banerjee, Santanu; Zushi, H.; Nishino, N. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aacb69	journal	June 2018
Observation of modified divertor particle flux with coherent modes in KSTAR edge plasma Thatipamula, Shekar G.; Kim, H. S.; Bak, J. G. Plasma Physics and Controlled Fusion, Vol. 61, Issue 2 https://doi.org/10.1088/1361-6587/aaf2a5	journal	January 2019
High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade Medvedeva, A.; Bottereau, C.; Clairet, F. Plasma Physics and Controlled Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1361-6587/ab2575	journal	June 2019
Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade Viezzer, E.; Cavedon, M.; Cano-Megias, P. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab5b1d	journal	January 2020
A gyrokinetic perspective on the JET-ILW pedestal Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa51e1	journal	January 2017
Divertor heat flux simulations in ELMy H-mode discharges of EAST Xia, T. Y.; Xu, X. Q.; Wu, Y. B. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7bba	journal	August 2017
Pedestal evolution physics in low triangularity JET tokamak discharges with ITER-like wall Bowman, C.; Dickinson, D.; Horvath, L. Nuclear Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/1741-4326/aa90bc	journal	November 2017
Nonlinear coupling induced toroidal structure of edge localized modes Mink, A. F.; Hoelzl, M.; Wolfrum, E. Nuclear Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/1741-4326/aa98f7	journal	December 2017
Effect of pedestal fluctuation on ELM frequency in the EAST tokamak Zhong, F. B.; Zhang, T.; Liu, Z. X. Nuclear Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/1741-4326/aab30a	journal	March 2018
Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST Chen, Ran; Zhang, Heng; Xu, Guosheng Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aab96e	journal	September 2018
Characterization of low-frequency inter-ELM modes of H-mode discharges at ASDEX Upgrade Vanovac, B.; Wolfrum, E.; Hoelzl, M. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aada20	journal	October 2018
Long-lived coupled peeling ballooning modes preceding ELMs on JET Perez von Thun, C.; Frassinetti, L.; Horvath, L. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0031	journal	March 2019
Multi-scale interaction of pedestal instabilities in H-mode plasma on the EAST tokamak Zhang, T.; Geng, K. N.; Liu, H. Q. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0755	journal	April 2019
Role of the pedestal position on the pedestal performance in AUG, JET-ILW and TCV and implications for ITER Frassinetti, L.; Dunne, M. G.; Sheikh, U. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab1eb9	journal	June 2019
Gyrokinetic analysis and simulation of pedestals to identify the culprits for energy losses using ‘fingerprints’ Kotschenreuther, M.; Liu, X.; Hatch, D. R. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab1fa2	journal	July 2019
Direct gyrokinetic comparison of pedestal transport in JET with carbon and ITER-like walls Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. M. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab25bd	journal	July 2019
A low-frequency axisymmetric oscillation in the high-confinement mode pedestal on the EAST tokamak Xiang, H. M.; Zhang, T.; Ye, K. X. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab33df	journal	September 2019
Nonlinear simulation and energy analysis of the EAST coherent mode Huang, Y. Q.; Xia, T. Y.; Xu, X. Q. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5e73	journal	January 2020
Direct Gyrokinetic Comparison of Pedestal Transport in JET with Carbon and ITER-Like Walls Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. M. arXiv https://doi.org/10.48550/arxiv.1903.02627	text	January 2019
Gyrokinetic analysis and simulation of pedestals, to identify the culprits for energy losses using fingerprints Kotschenreuther, M.; Liu, X.; Hatch, D. R. arXiv https://doi.org/10.48550/arxiv.1903.09994	text	January 2019

Similar Records

Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas · OSTI ID:1257720

Diallo, A.; Groebner, R. J.; Rhodes, T. L.; +6 more

Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas · OSTI ID:1257720

Diallo, A.; Battaglia, D. J.; Guttenfelder, W.; +6 more

Inter-ELM pedestal evolution and the role of edge fluctuations in the C-Mod and DIII-D tokamaks

Dataset · Mon Sep 27 00:00:00 EDT 2021 · OSTI ID:1257720

Diallo, A.; Groebner, R. J.; Hughes, J. W.; +12 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Tokamaks
Turbulence
Edge Plasma
Gyrokinetic Equations

Title: Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-D

Citation Formats

References (42)

Cited By (28)

Similar Records

Related Subjects