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Title: Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade

Abstract

The dynamic behaviour of the ion and electron energy, particle and momentum transport measured during type-I edge localized mode (ELM) cycles at ASDEX Upgrade is presented. Fast measurements of the ion and electron temperature profiles revelead that the ion and electron energy transport recover on different timescales, with the electrons recovering on a slower timescale. The dominant mechanism for the additional energy transport in the electron channel that could cause the delay in the electron temperature gradient ($${\rm{\nabla }}{T}_{e}$$) recovery is attributed to the depletion of energy caused by the ELM. The local sources and sinks for the electron channel in the steep gradient region are much smaller compared to the energy flux arriving from the pedestal top, indicating that the core plasma may dictate the local dynamics of the $${\rm{\nabla }}{T}_{e}$$ recovery during the ELM cycle. A model for the edge momentum transport based on toroidal torque balance that takes into account the existence of poloidal impurity asymmetries has been developed. The analysis of the profile evolution during the ELM cycle shows that the model captures the dynamics of the rotation both before the ELM crash and during the recovery phase.

Authors:
ORCiD logo [1];  [2]; ORCiD logo;  [2];  [2]; ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of Seville (Spain)
  2. Max Planck Inst. for Plasma Physics, Garching (Germany)
  3. Technische Univ., Wien - ÖAW, Vienna (Austria). Inst. of Applied Physics
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; EUROfusion Consortium; H2020 Marie-Sklodowska Curie Programme; European Research Council (ERC)
Contributing Org.:
The ASDEX Upgrade Team
OSTI Identifier:
1598047
Grant/Contract Number:  
AC02-09CH11466; 633053; 708257; 805162
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 62; Journal Issue: 2; Conference: 46.EPS Conference on Plasma Physics, Milan (Italy), 8-12 Jul 2019; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic confinement fusion; plasma transport; magnetohydrodynamics

Citation Formats

Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., and Willensdorfer, M. Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade. United States: N. p., 2020. Web. doi:10.1088/1361-6587/ab5b1d.
Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., & Willensdorfer, M. Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade. United States. doi:10.1088/1361-6587/ab5b1d.
Viezzer, E., Cavedon, M., Cano-Megias, P., Fable, E., Wolfrum, E., Cruz-Zabala, D. J., David, P., Dux, R., Fischer, R., Harrer, G. F., Laggner, F. M., McDermott, R. M., Plank, U., Pütterich, T., and Willensdorfer, M. Tue . "Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade". United States. doi:10.1088/1361-6587/ab5b1d. https://www.osti.gov/servlets/purl/1598047.
@article{osti_1598047,
title = {Dynamics of the pedestal transport during edge localized mode cycles at ASDEX Upgrade},
author = {Viezzer, E. and Cavedon, M. and Cano-Megias, P. and Fable, E. and Wolfrum, E. and Cruz-Zabala, D. J. and David, P. and Dux, R. and Fischer, R. and Harrer, G. F. and Laggner, F. M. and McDermott, R. M. and Plank, U. and Pütterich, T. and Willensdorfer, M.},
abstractNote = {The dynamic behaviour of the ion and electron energy, particle and momentum transport measured during type-I edge localized mode (ELM) cycles at ASDEX Upgrade is presented. Fast measurements of the ion and electron temperature profiles revelead that the ion and electron energy transport recover on different timescales, with the electrons recovering on a slower timescale. The dominant mechanism for the additional energy transport in the electron channel that could cause the delay in the electron temperature gradient (${\rm{\nabla }}{T}_{e}$) recovery is attributed to the depletion of energy caused by the ELM. The local sources and sinks for the electron channel in the steep gradient region are much smaller compared to the energy flux arriving from the pedestal top, indicating that the core plasma may dictate the local dynamics of the ${\rm{\nabla }}{T}_{e}$ recovery during the ELM cycle. A model for the edge momentum transport based on toroidal torque balance that takes into account the existence of poloidal impurity asymmetries has been developed. The analysis of the profile evolution during the ELM cycle shows that the model captures the dynamics of the rotation both before the ELM crash and during the recovery phase.},
doi = {10.1088/1361-6587/ab5b1d},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 62,
place = {United States},
year = {2020},
month = {1}
}

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Works referenced in this record:

Inter-ELM pedestal localized fluctuations in tokamaks: Summary of multi-machine observations
journal, May 2019


Parameter dependences of small edge localized modes (ELMs)
journal, September 2018


Toroidal rotation in neutral beam heated discharges in DIII-D
journal, January 2003


Edge momentum transport by neutrals: an interpretive numerical framework
journal, May 2017


ELM behaviour and linear MHD stability of edge ECRH heated ASDEX Upgrade plasmas
journal, April 2016


Overview of toroidal momentum transport
journal, August 2011


Pedestal and E r profile evolution during an edge localized mode cycle at ASDEX Upgrade
journal, August 2017

  • Cavedon, M.; Pütterich, T.; Viezzer, E.
  • Plasma Physics and Controlled Fusion, Vol. 59, Issue 10
  • DOI: 10.1088/1361-6587/aa7ad0

Characterization of intrinsic rotation drive on DIII-D
journal, May 2011


Intrinsic Toroidal Rotation, Density Peaking, and Turbulence Regimes in the Core of Tokamak Plasmas
journal, November 2011


Mechanisms of plasma rotation effects on the stability of type-I edge-localized mode in tokamaks
journal, May 2011


Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes
journal, May 2002

  • Snyder, P. B.; Wilson, H. R.; Ferron, J. R.
  • Physics of Plasmas, Vol. 9, Issue 5
  • DOI: 10.1063/1.1449463

Experimental studies of toroidal momentum transport in ASDEX Upgrade
journal, December 2004

  • Nishijima, D.; Kallenbach, A.; Günter, S.
  • Plasma Physics and Controlled Fusion, Vol. 47, Issue 1
  • DOI: 10.1088/0741-3335/47/1/006

Edge profiles of electron temperature and density during ELMy H-mode in ohmically heated TCV plasmas
journal, July 2007


Correlations between quasi-coherent fluctuations and the pedestal evolution during the inter-edge localized modes phase on DIII-Da)
journal, May 2015

  • Diallo, A.; Groebner, R. J.; Rhodes, T. L.
  • Physics of Plasmas, Vol. 22, Issue 5
  • DOI: 10.1063/1.4921148

Studies of the pedestal structure and inter-ELM pedestal evolution in JET with the ITER-like wall
journal, August 2017


Pedestal confinement and stability in JET-ILW ELMy H-modes
journal, September 2015


High frequency magnetic fluctuations correlated with the inter-ELM pedestal evolution in ASDEX Upgrade
journal, May 2016


Chaos cuts ELMs down to size
journal, June 2006


Toroidal Momentum Pinch Velocity due to the Coriolis Drift Effect on Small Scale Instabilities in a Toroidal Plasma
journal, June 2007


A fast edge charge exchange recombination spectroscopy system at the ASDEX Upgrade tokamak
journal, April 2017

  • Cavedon, M.; Pütterich, T.; Viezzer, E.
  • Review of Scientific Instruments, Vol. 88, Issue 4
  • DOI: 10.1063/1.4979801

Flow shear suppression of pedestal ion temperature gradient turbulence-A first principles theoretical framework
journal, June 2018

  • Hatch, D. R.; Hazeltine, R. D.; Kotschenreuther, M. K.
  • Plasma Physics and Controlled Fusion, Vol. 60, Issue 8
  • DOI: 10.1088/1361-6587/aac7a7

Edge impurity dynamics during an edge-localized mode cycle on DIII-D
journal, May 2005

  • Wade, M. R.; Burrell, K. H.; Hogan, J. T.
  • Physics of Plasmas, Vol. 12, Issue 5
  • DOI: 10.1063/1.1891745

Inter-ELM pedestal evolution on MAST and impact of resonant magnetic perturbations
journal, February 2013


Confinement of angular momentum in divertor and limiter discharges in the Doublet III tokamak
journal, January 1988


Influence of sheared poloidal rotation on edge turbulence
journal, January 1990

  • Biglari, H.; Diamond, P. H.; Terry, P. W.
  • Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1
  • DOI: 10.1063/1.859529

Evidence for the neoclassical nature of the radial electric field in the edge transport barrier of ASDEX Upgrade
journal, December 2013


Collisionality dependence of edge rotation and in–out impurity asymmetries in ASDEX Upgrade H-mode plasmas
journal, October 2015


ELM flushing and impurity transport in the H-mode edge barrier in ASDEX Upgrade
journal, August 2011


Reduced charge state equations that describe Pfirsch Schlüter impurity transport in tokamak plasma
journal, January 2000


The mechanism for toroidal momentum input to Tokamak plasmas from neutral beams
journal, August 1999


Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER
journal, August 2013


High-accuracy characterization of the edge radial electric field at ASDEX Upgrade
journal, April 2013


Characterization of the H-mode edge barrier at ASDEX Upgrade
journal, July 2005


Edge localized mode rotation and the nonlinear dynamics of filaments
journal, April 2016

  • Morales, J. A.; Bécoulet, M.; Garbet, X.
  • Physics of Plasmas, Vol. 23, Issue 4
  • DOI: 10.1063/1.4947201

Characterization of the angular momentum transport in ASDEX
journal, June 1991

  • Kallenbach, A.; Mayer, H. M.; Fussmann, G.
  • Plasma Physics and Controlled Fusion, Vol. 33, Issue 6
  • DOI: 10.1088/0741-3335/33/6/004

A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model
journal, August 2011


Edge localized modes (ELMs)
journal, February 1996


Structure of micro-instabilities in tokamak plasmas: Stiff transport or plasma eruptions?
journal, January 2014

  • Dickinson, D.; Roach, C. M.; Skipp, J. M.
  • Physics of Plasmas, Vol. 21, Issue 1
  • DOI: 10.1063/1.4861628

Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas
journal, March 2014


Bifurcation of poloidal rotation and suppression of turbulent fluctuations: A model for the L–H transition in tokamaks
journal, June 1990

  • Shaing, K. C.; Crume, E. C.; Houlberg, W. A.
  • Physics of Fluids B: Plasma Physics, Vol. 2, Issue 6
  • DOI: 10.1063/1.859473

Pedestal stability comparison and ITER pedestal prediction
journal, July 2009


Stability and dynamics of the edge pedestal in the low collisionality regime: physics mechanisms for steady-state ELM-free operation
journal, August 2007


In–out impurity density asymmetry in the pedestal region of Alcator C-Mod
journal, November 2013


Rotation and density asymmetries in the presence of large poloidal impurity flows in the edge pedestal
journal, November 2013


Neoclassical ion transport in rotating axisymmetric plasmas
journal, January 1985

  • Hinton, F. L.; Wong, S. K.
  • Physics of Fluids, Vol. 28, Issue 10
  • DOI: 10.1063/1.865350

Core intrinsic rotation behaviour in ASDEX Upgrade ohmic L-mode plasmas
journal, March 2014


Gyrokinetic analysis and simulation of pedestals to identify the culprits for energy losses using ‘fingerprints’
journal, July 2019


Poloidal asymmetry of parallel rotation measured in ASDEX Upgrade
journal, July 2012


Investigation of inter-ELM ion heat transport in the H-mode pedestal of ASDEX Upgrade plasmas
journal, October 2016


Gyrokinetic microinstabilities in ASDEX Upgrade edge plasmas
journal, October 2008

  • Told, D.; Jenko, F.; Xanthopoulos, P.
  • Physics of Plasmas, Vol. 15, Issue 10
  • DOI: 10.1063/1.3000132

Edge Localized Modes in Tokamaks
journal, February 2008


SOLPS modelling of ASDEX upgrade H-mode plasma
journal, May 2006


Inter-ELM behaviour of the electron density and temperature pedestal in ASDEX Upgrade
journal, September 2010


Edge-Localized-Mode–Induced Transport of Impurity Density, Energy, and Momentum
journal, June 2005


Nonlinear coupling induced toroidal structure of edge localized modes
journal, December 2017


Analysis of pedestal plasma transport
journal, May 2010


Experimental observations and modelling of intrinsic rotation reversals in tokamaks
journal, January 2017

  • Camenen, Y.; Angioni, C.; Bortolon, A.
  • Plasma Physics and Controlled Fusion, Vol. 59, Issue 3
  • DOI: 10.1088/1361-6587/aa543a

Impact of wall materials and seeding gases on the pedestal and on core plasma performance
journal, August 2017


Main-Ion Intrinsic Toroidal Rotation Profile Driven by Residual Stress Torque from Ion Temperature Gradient Turbulence in the DIII-D Tokamak
journal, January 2017


Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D
journal, May 2017

  • Chrystal, C.; Grierson, B. A.; Staebler, G. M.
  • Physics of Plasmas, Vol. 24, Issue 5
  • DOI: 10.1063/1.4979194

On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
journal, January 2019


Edge Localized Modes in Tokamaks
journal, February 2010