Heat flux modeling using ion drift effects in DIII-D H-mode plasmas with resonant magnetic perturbations

Wingen, Andreas; Schmitz, Oliver; Evans, Todd E.; Spatschek, K. H.

doi:10.1063/1.4862034

Title: Heat flux modeling using ion drift effects in DIII-D H-mode plasmas with resonant magnetic perturbations

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4862034· OSTI ID:1367091

Wingen, Andreas ^[1]; Schmitz, Oliver ^[2]; Evans, Todd E. ^[3]; Spatschek, K. H. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Forschungszentrum Julich (Germany)
General Atomics, San Diego, CA (United States)
Heinrich-Heine-Univ. Dusseldorf (Germany)

The heat flux patterns measured in low-collisionality DIII-D H-mode plasmas strongly deviate from simultaneously measured CII emission patterns, used as indicator of particle flux, during applied resonant magnetic perturbations. While the CII emission clearly shows typical striations, which are similar to magnetic footprint patterns obtained from vacuum field line tracing, the heat flux is usually dominated by one large peak at the strike point position. The vacuum approximation, which only considers applied magnetic fields and neglects plasma response and plasma effects, cannot explain the shape of the observed heat flux pattern. One possible explanation is the effect of particle drifts. This is included in the field line equations and the results are discussed with reference to the measurement. Electrons and ions show different drift motions at thermal energy levels in a guiding center approximation. While electrons hardly deviate from the field lines, ions can drift several centimetres away from field line flux surfaces. In this paper, a model is presented in which an ion heat flux, based on the ion drift motion from various kinetic energies as they contribute to a thermal Maxwellian distribution, is calculated. The simulated heat flux is directly compared to measurements with a varying edge safety factor q ₉₅. This analysis provides evidence for the dominate effect of high-energy ions in carrying heat from the plasma inside the separatrix to the target. Finally, high-energy ions are deposited close to the unperturbed strike line, while low-energy ions can travel into the striated magnetic topology.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; AC05-00OR22725; DFG-SP229/1-1

OSTI ID:: 1367091

Alternate ID(s):: OSTI ID: 1265643

Journal Information:: Physics of Plasmas, Vol. 21, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 10 works

Citation information provided by
Web of Science

References (37)

Influence of different DED base mode configurations on the radial electric field at the plasma edge of TEXTOR Wingen, A.; Spatschek, K. H. Nuclear Fusion, Vol. 50, Issue 3 https://doi.org/10.1088/0029-5515/50/3/034009	journal	February 2010
Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D Jakubowski, M. W.; Evans, T. E.; Fenstermacher, M. E. Nuclear Fusion, Vol. 49, Issue 9 https://doi.org/10.1088/0029-5515/49/9/095013	journal	August 2009
3D Edge Transport Studies with EMC3-EIRENE for the Dynamic Ergodic Divertor (DED) at TEXTOR Harting, D.; Reiter, D.; Feng, Y. Contributions to Plasma Physics, Vol. 48, Issue 1-3 https://doi.org/10.1002/ctpp.200810017	journal	March 2008
Three-dimensional edge transport simulations for DIII-D plasmas with resonant magnetic perturbations Frerichs, H.; Reiter, D.; Schmitz, O. Nuclear Fusion, Vol. 50, Issue 3 https://doi.org/10.1088/0029-5515/50/3/034004	journal	February 2010
Effect of nonaxisymmetric magnetic perturbations on divertor heat and particle flux profiles in National Spherical Torus Experiment Ahn, J-W.; Maingi, R.; Canik, J. M. Physics of Plasmas, Vol. 18, Issue 5 https://doi.org/10.1063/1.3574522	journal	May 2011
Resonant features of energy and particle transport during application of resonant magnetic perturbation fields at TEXTOR and DIII-D Schmitz, O.; Evans, T. E.; Fenstermacher, M. E. Nuclear Fusion, Vol. 52, Issue 4 https://doi.org/10.1088/0029-5515/52/4/043005	journal	March 2012
Footprint structures due to resonant magnetic perturbations in DIII-D Wingen, A.; Evans, T. E.; Spatschek, K. H. Physics of Plasmas, Vol. 16, Issue 4 https://doi.org/10.1063/1.3099053	journal	April 2009
The physics of edge localized modes (ELMs) and their role in power and particle exhaust Zohm, Hartmut Plasma Physics and Controlled Fusion, Vol. 38, Issue 8 https://doi.org/10.1088/0741-3335/38/8/012	journal	August 1996
Observation of the heteroclinic tangles in the heat flux pattern of the ergodic divertor at TEXTOR Jakubowski, M. W.; Wingen, A.; Abdullaev, S. S. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2007.01.158	journal	June 2007
Sheared Plasma Rotation in Partially Stochastic Magnetic Fields Wingen, A.; Spatschek, K. H. Physical Review Letters, Vol. 102, Issue 18 https://doi.org/10.1103/PhysRevLett.102.185002	journal	May 2009
Formation of a three-dimensional scrape-off layer in a fast rotating resonant magnetic perturbation field at TEXTOR Stoschus, H.; Schmitz, O.; Unterberg, B. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.10.033	journal	August 2011
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime Sauter, O.; Angioni, C.; Lin-Liu, Y. R. Physics of Plasmas, Vol. 6, Issue 7 https://doi.org/10.1063/1.873240	journal	July 1999
The influence of three-dimensional stochastic magnetic boundaries on plasma edge transport and the resulting plasma wall interaction Schmitz, O.; Evans, T. E.; Fenstermacher, M. E. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2011.01.136	journal	August 2011
Influence of stochastic magnetic fields on relativistic electrons Wingen, A.; Abdullaev, S. S.; Finken, K. H. Nuclear Fusion, Vol. 46, Issue 11 https://doi.org/10.1088/0029-5515/46/11/008	journal	October 2006
Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas Schmitz, O.; Evans, T. E.; Fenstermacher, M. E. Physical Review Letters, Vol. 103, Issue 16 https://doi.org/10.1103/PhysRevLett.103.165005	journal	October 2009
Transport and divertor properties of the dynamic ergodic divertor Lehnen, M.; Abdullaev, S.; Biel, W. Plasma Physics and Controlled Fusion, Vol. 47, Issue 12B https://doi.org/10.1088/0741-3335/47/12B/S18	journal	November 2005
Particle, heat, and sheath power transmission factor profiles during ELM suppression experiments on DIII-D Watkins, J. G.; Evans, T. E.; Jakubowski, M. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.221	journal	June 2009
Modeling of stochastic magnetic flux loss from the edge of a poloidally diverted tokamak Evans, T. E.; Moyer, R. A.; Monat, P. Physics of Plasmas, Vol. 9, Issue 12 https://doi.org/10.1063/1.1521125	journal	December 2002
Rotation dependent ion fluxes in front of resonant magnetic perturbation coils Stoschus, H.; Lehnen, M.; Schmitz, O. Nuclear Fusion, Vol. 53, Issue 1 https://doi.org/10.1088/0029-5515/53/1/012001	journal	December 2012
Traces of stable and unstable manifolds in heat flux patterns Wingen, A.; Jakubowski, M.; Spatschek, K. H. Physics of Plasmas, Vol. 14, Issue 4 https://doi.org/10.1063/1.2715548	journal	April 2007
Calculation of stochastic thermal transport due to resonant magnetic perturbations in DIII-D Joseph, I.; Evans, T. E.; Runov, A. M. Nuclear Fusion, Vol. 48, Issue 4 https://doi.org/10.1088/0029-5515/48/4/045009	journal	March 2008
High resolution numerical studies of separatrix splitting due to non-axisymmetric perturbation in DIII-D Wingen, A.; Evans, T. E.; Spatschek, K. H. Nuclear Fusion, Vol. 49, Issue 5 https://doi.org/10.1088/0029-5515/49/5/055027	journal	April 2009
Aspects of three dimensional transport for ELM control experiments in ITER-similar shape plasmas at low collisionality in DIII-D Schmitz, O.; Evans, T. E.; Fenstermacher, M. E. Plasma Physics and Controlled Fusion, Vol. 50, Issue 12 https://doi.org/10.1088/0741-3335/50/12/124029	journal	November 2008
Chapter 1: Overview and summary Editors, ITER Physics Basis; Co-Chairs, ITER Physics Expert Group Chairs an; Unit, ITER Joint Central Team and Physics Nuclear Fusion, Vol. 39, Issue 12 https://doi.org/10.1088/0029-5515/39/12/301	journal	December 1999
Characterization of transport in the stochastic edge layer of TEXTOR by analysis of the radial and poloidal distribution of electron density and temperature Schmitz, O.; Harting, D.; Abdullaev, S. S. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2007.01.067	journal	June 2007
The dynamic ergodic divertor in the TEXTOR tokamak: plasma response to dynamic helical magnetic field perturbations Finken, K. H.; Abdullaev, S. S.; Biel, W. Plasma Physics and Controlled Fusion, Vol. 46, Issue 12B https://doi.org/10.1088/0741-3335/46/12B/013	journal	November 2004
Heat deposition patterns on the target plates of the dynamic ergodic divertor Jakubowski, M. W.; Abdullaev, S. S.; Finken, K. H. Journal of Nuclear Materials, Vol. 337-339 https://doi.org/10.1016/j.jnucmat.2004.10.127	journal	March 2005
Modification of divertor heat and particle flux profiles with applied 3D fields in NSTX H-mode plasmas Ahn, J. -W.; Canik, J. M.; Soukhanovskii, V. A. Nuclear Fusion, Vol. 50, Issue 4 https://doi.org/10.1088/0029-5515/50/4/045010	journal	April 2010
Impact of screening of resonant magnetic perturbations in three dimensional edge plasma transport simulations for DIII-D Frerichs, H.; Reiter, D.; Schmitz, O. Physics of Plasmas, Vol. 19, Issue 5 https://doi.org/10.1063/1.4714616	journal	May 2012
Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas Evans, Todd E.; Moyer, Richard A.; Burrell, Keith H. Nature Physics, Vol. 2, Issue 6 https://doi.org/10.1038/nphys312	journal	May 2006
Mapping of drift surfaces in toroidal systems with chaotic magnetic fields Abdullaev, S. S.; Wingen, A.; Spatschek, K. H. Physics of Plasmas, Vol. 13, Issue 4 https://doi.org/10.1063/1.2181975	journal	April 2006
Experimental signatures of homoclinic tangles in poloidally diverted tokamaks Evans, T. E.; Roeder, R. K. W.; Carter, J. A. Journal of Physics: Conference Series, Vol. 7 https://doi.org/10.1088/1742-6596/7/1/015	journal	January 2005
The Plasma Boundary of Magnetic Fusion Devices Stangeby, Peter C. Plasma Physics and Controlled Fusion, Vol. 43, Issue 2 https://doi.org/10.1887/0750305592	book	January 2000
Explicit calculations of homoclinic tangles in tokamaks Roeder, R. K. W.; Rapoport, B. I.; Evans, T. E. Physics of Plasmas, Vol. 10, Issue 9 https://doi.org/10.1063/1.1592515	journal	September 2003
Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER Loarte, A.; Saibene, G.; Sartori, R. Plasma Physics and Controlled Fusion, Vol. 45, Issue 9 https://doi.org/10.1088/0741-3335/45/9/302	journal	August 2003
Ambipolar stochastic particle diffusion and plasma rotation Wingen, A.; Spatschek, K. H. Physics of Plasmas, Vol. 15, Issue 5 https://doi.org/10.1063/1.2912454	journal	May 2008
Plasma currents induced by resonant magnetic field perturbations in tokamaks Reiser, D.; Chandra, D. Physics of Plasmas, Vol. 16, Issue 4 https://doi.org/10.1063/1.3126548	journal	April 2009

Cited By (2)

Imaging divertor strike point splitting in RMP ELM suppression experiments in the DIII-D tokamak Moyer, R. A.; Bykov, I.; Orlov, D. M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038350	journal	October 2018
Efficient manifolds tracing for planar maps Ciro, David; Caldas, Iberê L.; Viana, Ricardo L. Chaos: An Interdisciplinary Journal of Nonlinear Science, Vol. 28, Issue 9 https://doi.org/10.1063/1.5027698	journal	September 2018

Similar Records

Heat flux modeling using ion drift effects in DIII-D H-mode plasmas with resonant magnetic perturbations

Journal Article · Wed Jan 15 00:00:00 EST 2014 · Physics of Plasmas · OSTI ID:1367091

Wingen, A.; Schmitz, O.; Evans, T. E.; +1 more

Evidence and modeling of 3D divertor footprint induced by lower hybrid waves on EAST with tungsten divertor operations

Journal Article · Thu Oct 26 00:00:00 EDT 2017 · Nuclear Fusion · OSTI ID:1367091

Feng, W.; Wang, L.; Rack, M.; +35 more

The Influence of Three-dimensional Stochastic Magnetic Boundaries on Plasma Edge Transport and the Resulting Plasma Wall Interaction

Conference · Sat Jan 01 00:00:00 EST 2011 · OSTI ID:1367091

Schmitz, O; Evans, T E; Fenstermacher, M E; +16 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
magnetic fields
divertors
plasma diagnostics
plasma temperature

Title: Heat flux modeling using ion drift effects in DIII-D H-mode plasmas with resonant magnetic perturbations

Citation Formats

References (37)

Cited By (2)

Similar Records

Related Subjects