V. Rozhansky1, E. Kaveeva1, I. Veselova1, S. Voskoboynikov1, D

Slides:

Advertisements

Similar presentations

K. Krieger, SEWG Meeting on Material Migration and ITER Material Mix, JET, Max-Planck-Institut für Plasmaphysik Carbon local transport and redeposition.

Advertisements

Introduction to Plasma-Surface Interactions Lecture 6 Divertors.

Simulations of the core/SOL transition of a tokamak plasma Frederic Schwander,Ph. Ghendrih, Y. Sarazin IRFM/CEA Cadarache G. Ciraolo, E. Serre, L. Isoardi,

6th Japan Korea workshop July 2011, NIFS, Toki-city Japan Edge impurity transport study in stochastic layer of LHD and scrape-off layer of HL-2A.

Momentum Transport During Reconnection Events in the MST Reversed Field Pinch Alexey Kuritsyn In collaboration with A.F. Almagri, D.L. Brower, W.X. Ding,

Institute of Interfacial Process Engineering and Plasma Technology Gas-puff imaging of blob filaments at ASDEX Upgrade TTF Workshop.

Two-dimensional Structure and Particle Pinch in a Tokamak H-mode

Inter-ELM Edge Profile and Ion Transport Evolution on DIII-D John-Patrick Floyd, W. M. Stacey, S. Mellard (Georgia Tech), and R. J. Groebner (General Atomics)

SUGGESTED DIII-D RESEARCH FOCUS ON PEDESTAL/BOUNDARY PHYSICS Bill Stacey Georgia Tech Presented at DIII-D Planning Meeting

Paper O4.007, R. A. Pitts et al., 34th EPS Conference: 5 July 2007 Neoclassical and transport driven parallel SOL flows on TCV R. A. Pitts, J. Horacek.

Plasma Dynamics Lab HIBP Abstract Measurements of the radial equilibrium potential profiles have been successfully obtained with a Heavy Ion Beam Probe.

GTC Status: Physics Capabilities & Recent Applications Y. Xiao for GTC team UC Irvine.

INVESTIGATIONS OF MAGNETICALLY ENHANCED RIE REACTORS WITH ROTATING (NON-UNIFORM) MAGNETIC FIELDS Natalia Yu. Babaeva and Mark J. Kushner University of.

Physics of Fusion power Lecture 7: Stellarator / Tokamak.

A. HerrmannITPA - Toronto /19 Filaments in the SOL and their impact to the first wall EURATOM - IPP Association, Garching, Germany A. Herrmann,

Chalmers University of Technology The L-H transition on EAST Jan Weiland and C.S. Liu Chalmers University of Technoloy and EURATOM_VR Association, S

N EOCLASSICAL T OROIDAL A NGULAR M OMENTUM T RANSPORT IN A R OTATING I MPURE P LASMA S. Newton & P. Helander This work was funded jointly by EURATOM and.

Neoclassical Transport

Joaquim Loizu P. Ricci, F. Halpern, S. Jolliet, A. Mosetto

Edge Localized Modes propagation and fluctuations in the JET SOL region presented by Bruno Gonçalves EURATOM/IST, Portugal.

Challenging problems in kinetic simulation of turbulence and transport in tokamaks Yang Chen Center for Integrated Plasma Studies University of Colorado.

Excitation of ion temperature gradient and trapped electron modes in HL-2A tokamak The 3 th Annual Workshop on Fusion Simulation and Theory, Hefei, March.

Plasma Dynamics Lab HIBP E ~ 0 V/m in Locked Discharges Average potential ~ 580 V  ~ V less than in standard rotating plasmas Drop in potential.

Rotation effects in MGI rapid shutdown simulations V.A. Izzo, P.B. Parks, D. Shiraki, N. Eidietis, E. Hollmann, N. Commaux TSD Workshop 2015 Princeton,

RF simulation at ASIPP Bojiang DING Institute of Plasma Physics, Chinese Academy of Sciences Workshop on ITER Simulation, Beijing, May 15-19, 2006 ASIPP.

Physics of fusion power Lecture 9 : The tokamak continued.

SLM 2/29/2000 WAH 13 Mar NBI Driven Neoclassical Effects W. A. Houlberg ORNL K.C. Shaing, J.D. Callen U. Wis-Madison NSTX Meeting 25 March 2002.

Radial Electric Field Formation by Charge Exchange Reaction at Boundary of Fusion Device* K.C. Lee U.C. Davis *submitted to Physics of Plasmas.

EXTENSIONS OF NEOCLASSICAL ROTATION THEORY & COMPARISON WITH EXPERIMENT W.M. Stacey 1 & C. Bae, Georgia Tech Wayne Solomon, Princeton TTF2013, Santa Rosa,

1 Recent Studies of NSTX Edge Plasmas: XGC0 Modeling, MARFE Analysis and Separatrix Location F. Kelly a, R. Maqueda b, R. Maingi c, J. Menard a, B. LeBlanc.

Summary on transport IAEA Technical Meeting, Trieste Italy Presented by A.G. Peeters.

1 SIMULATION OF ANOMALOUS PINCH EFFECT ON IMPURITY ACCUMULATION IN ITER.

Fyzika tokamaků1: Úvod, opakování1 Tokamak Physics Jan Mlynář 6. Neoclassical particle and heat transport Random walk model, diffusion coefficient, particle.

Role of thermal instabilities and anomalous transport in the density limit M.Z.Tokar, F.A.Kelly, Y.Liang, X.Loozen Institut für Plasmaphysik, Forschungszentrum.

Non-linear MHD modelling of RMPs with toroidal rotation and resonant and non-resonant plasma braking. M.Becoulet G. Huysmans, E. Nardon Association Euratom-CEA,

Neoclassical Effects in the Theory of Magnetic Islands: Neoclassical Tearing Modes and more A. Smolyakov* University of Saskatchewan, Saskatoon, Canada,

21st IAEA Fusion Energy Conf. Chengdu, China, Oct.16-21, /17 Gyrokinetic Theory and Simulation of Zonal Flows and Turbulence in Helical Systems T.-H.

52nd Annual Meeting of the Division of Plasma Physics, November , 2010, Chicago, Illinois Non-symmetric components were intentionally added to the.

Seminar PPPL, 25 January 2011 Association Euratom-Cea 1 Interplay between neoclassical and turbulent transport on Tore Supra Acknowledgements: J. Abiteboul,

DIII-D RMP simulations: enhanced density transport and rotation screening V.A. Izzo, I. Joseph NIMROD meeting:

1 Peter de Vries – ITPA T meeting Culham – March 2010 P.C. de Vries 1,2, T.W. Versloot 1, A. Salmi 3, M-D. Hua 4, D.H. Howell 2, C. Giroud 2, V. Parail.

53rd Annual Meeting of the Division of Plasma Physics, November , 2010, Salt Lake City, Utah 5-pin Langmuir probe configured to measure the Reynolds.

53rd Annual Meeting of the Division of Plasma Physics, November , 2011, Salt Lake City, Utah When the total flow will move approximately along the.

IAEA-TM 02/03/2005 1G. Falchetto DRFC, CEA-Cadarache Association EURATOM-CEA NON-LINEAR FLUID SIMULATIONS of THE EFFECT of ROTATION on ION HEAT TURBULENT.

Plan V. Rozhansky, E. Kaveeva St.Petersburg State Polytechnical University, , Polytechnicheskaya 29, St.Petersburg, Russia Poloidal and Toroidal.

Flows Move Primarily Along the Helical Direction of Symmetry Geometric factors are used to relate the measured velocities to the average flow in the symmetry.

TEC Short introduction to plasma fluid theory Dominik Schega.

Energetic ion excited long-lasting “sword” modes in tokamak plasmas with low magnetic shear Speaker:RuiBin Zhang Advisor:Xiaogang Wang School of Physics,

ASIPP 1 Institute of Plasma Physics, Chinese Academy of Sciences Solved and Unsolved Problems in Plasma Physics A symposium in honor of Prof. Nathaniel.

54th Annual Meeting of the Division of Plasma Physics, October 29 – November 2, 2012, Providence, Rhode Island 5-pin Langmuir probe measures floating potential.

U NIVERSITY OF S CIENCE AND T ECHNOLOGY OF C HINA Influence of ion orbit width on threshold of neoclassical tearing modes Huishan Cai 1, Ding Li 2, Jintao.

Kinetic Effects on Slowly Rotating Magnetic Islands in Tokamaks

Neoclassical Predictions of ‘Electron Root’ Plasmas at HSX

Mechanisms for losses during Edge Localised modes (ELMs)

Spontaneous rotation in stellarator and tokamak

Chapter 3 Plasma as fluids

Recycling and impurity retention in high-density,

Generation of Toroidal Rotation by Gas Puffing

Mechanisms Controlling Parallel Flows in the SOL

Finite difference code for 3D edge modelling

Magnetic Ripple as a Tool for ELMs Mitigation

Gyrofluid Turbulence Modeling of the Linear

Center for Plasma Edge Simulation

Studies of Bias Induced Plasma Flows in HSX

Targeted Physics Optimization in HSX

Influence of energetic ions on neoclassical tearing modes

Development and Analysis of Gas Puff CXRS in SOL

Momentum Transport and Rotation Studies

Mikhail Z. Tokar and Mikhail Koltunov

XGC simulation of CMOD edge plasmas

Presentation transcript:

Understanding of Impurity Poloidal Distribution in Edge Pedestal by Modeling V. Rozhansky1, E. Kaveeva1, I. Veselova1, S. Voskoboynikov1, D. Coster2, E. Fable2, T. Puetterich2, E. Viezzer2, A. Kukushkin3 and the ASDEX Upgrade Team 1St.Petersburg State Polytechnical University, Polytechnicheskaya 29, 195251 St.Petersburg, Russia, 2Max-Planck Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany, 3ITER Organization 13067 St. Paul-lez-Durance France

Outlook Impurity transport in the edge transport barrier (ETB) region is responsible for inward penetration. Neoclassical convective flux? Impurities are used in Doppler spectroscopy to measure toroidal and poloidal rotation velocities and radial electric field in the separatrix vicinity . Poloidal asymmetries of impurities and parallel flows different from Pfirsch-Schlueter ones were observed on Cmod (Marr et al 2010), ASDEX-Upgrade (Viezzer et al 2013).

Outlook To understand the physics of impurity distribution and transport near the separatrix and in the scrape-off layer (SOL) simulations were performed with the B2SOLPS5.2 transport code The ASDEX-Upgrade H-mode shot, where HFS-LFS asymmetry was observed, was chosen for simulation. MAST H-mode shot has been simulated earlier What is the physics of HFS-LFS impurity asymmetry? Is radial convective transport described by standard neoclassical theory?

Predictions of the standard neoclassical theory Assumption: impurity density is a flux surface function Parallel velocities are Pfirsch-Schlueter (PS) velocities for each species (y-radial coordinate, hy-metric coefficient, Bx-poloidal field, Bz-toroidal field)).

Predictions of the standard neoclassical theory Direction of the PS flows of the main ions depends on the collisionality (in the absence of average toroidal rotation). Parallel PS velocities of species are completely different from those of the main ions since diamagnetic velocities are different. P.S. P.S.. plateau - P.S. P.S.. P.S. banana

Predictions of the standard neoclassical theory Parallel friction with the main ions is due to different PS velocities. Thermal force is caused by ion temperature perturbation on the flux surface (low part is hotter than the upper part). RIT RIU dTi < 0 dTi > 0

Predictions of the standard neoclassical theory Thermal force produces a torque (counter current at LFS ) for impurities. Parallel momentum balance for impurities For gradual density gradient inertia is negligible. Thermal force and friction are balanced by the pressure gradient. Density perturbations on the flux surface which arise to provide the required pressure gradient are small

Predictions of the standard neoclassical theory Radial transport could be obtained from the toroidal projection of the momentum balance equation.

Neoclassical theory with steep density gradient Standard theory is not valid if (V. Rozhansky Sov. Journ. Plasma Phys. 5 (1979) 771 ; 6 (1980) ; 10 (1984) 254 ), Fulop & Helander PoP 8 (2001) 3305 Standard neoclassical theory is not applicable in the edge barrier. Thermal force and friction are large as well as parallel pressure gradient which is inconsistent with assumptions. Strong poloidal asymmetry of impurity density is predicted.

Neoclassical theory with steep density gradient The parallel momentum balance (roughly) The parallel impurity flow is not PS. Parallel velocity is shifted with respect to the main ions velocity in the counter current direction at LFS. Divergence of the poloidal rotation is not balanced by PS fluxes but compensated by larger density at HFS with respect to LFS (smaller poloidal rotation at HFS). Strong poloidal asymmetry of impurity density is predicted.

Poloidal projection of the parallel impurity flows Poloidal projection of the parallel impurity flows. 1 – pressure-driven flows; 2 – caused by the thermal force. 1 2

Simulation results for ASDEX-Upgrade. Shot 28093 Simulation results for ASDEX-Upgrade. Shot 28093. Density and electron temperature profiles. (1-experiment, 2-simulation)

Simulation results for ASDEX-Upgrade. Shot 28093. Radial electric field. (1-experiment, 2-simulation)

Simulation results for ASDEX-Upgrade. Shot 28093 Simulation results for ASDEX-Upgrade. Shot 28093. Impurity radial density profiles. LFS HFS

Simulation results for ASDEX-Upgrade. Shot 28093 Simulation results for ASDEX-Upgrade. Shot 28093. Poloidal distribution of poloidal density and parallel velocity of impurities inside the separatrix. Asymmetry is of the order of 2. Parallel velocity of impurities strongly differs from that of the main ions. Flows from HFS towards LFS.

Simulation results for ASDEX-Upgrade. Shot 28093 Simulation results for ASDEX-Upgrade. Shot 28093. Radial distribution of parallel velocities inside the separatrix. Parallel velocity of impurity is shifted counter current at LFS and co-current at HFS LFS HFS

Simulation results for ASDEX-Upgrade. Shot 28093 Simulation results for ASDEX-Upgrade. Shot 28093. Components of parallel momentum balance equation for impurity ions Parallel friction is to large extent balanced by thermal force as predicted by theory

Simulation results for MAST (37th EPS Conf. on Plasma Phys Simulation results for MAST (37th EPS Conf. on Plasma Phys. 2010, Dublin P2.190) H-mode shot 18751. He ions radial density profiles at HFS (left) and LFS (right). Strong HFS-LFS asymmetry.

Simulation results for MAST (37th EPS Conf. on Plasma Phys Simulation results for MAST (37th EPS Conf. on Plasma Phys. 2010, Dublin P2.190) H-mode shot 18751. Poloidal and radial (LFS) profiles of the He ions parallel velocity. He+1 parallel velocity is counter current.

Discussion The strong LFS-HFS asymmetry of the impurity ion distribution in the edge transport barrier region is obtained in the simulations and in the experiments. The parallel velocities of impurities are quite different from their PS velocities. At the LFS the parallel velocities of impurities are shifted in the counter current direction with respect to those of the main ions. Impurity flows from HFS to LFS could be identified.

Discussion Neoclassical flux of impurities is directed inward and is reduced with respect to standard neoclassical one.

Back up

Radial electric field profile

MAST shot 17469. Transport coefficients

Understanding of Impurity Poloidal Distribution in Edge Pedestal by Modeling V. Rozhansky et al Simulation of the H-mode ASDEX-Upgrade shot with boron as an impurity was done with B2SOLPS5.2 transport code. Strong poloidal asymmetry of B+5 ions was obtained in accordance with experiment (E. Viezzer et al Plasma Phys. Contr. Fus.55 (2013) 124037) Understanding of the asymmetry is based on neoclassical effects and poloidal ExB drifts in plasma with strong gradients (Rozhansky Sov. Journ. Plasma Phys. 5 (1979) 771)