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5 results on '"Marushchenko N.B."'

1. ECRH scenarios with selective heating of trapped/passing electrons in the W7-X Stellarator

Author

Marushchenko N.B., Beidler C.D., Erckmann V., Geiger J., Helander P., Laqua H.P, Maassberg H., and Turkin Y.

Subjects
Physics, QC1-999
Abstract

Using specific features of the magnetic equilibrium in the W7-X stellarator, the ECRH scenarios with combined X2 and X3 modes are discussed. The RF beams for operation with X2 and X3 modes need to be launched from low- and, via the remote steering launcher, high-field-side, respectivaly, in the different crosssections of the device where the maximum and minimum of the magnetic field located. The aim is to explore the possibility of selective heating of the different classes of electrons, passing and trapped, by changing direction of the beam for X3 or switching between the beams for X2 and X3 launched from the different ports. The numerical predictions for this kind of experiments in W7-X are performed by coupled transport and ray tracing codes

Published
2015
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2. Summary for the Theory Session at EC-18

Author

Marushchenko N.B.

Subjects
Physics, QC1-999
Abstract

A brief review of the theory contributions presented in the EC-18 Workshop is given. The covered spectrum of topics is quite broad including the electron cyclotron wave propagation physics as well the results of numerical modelling of transport and current drive.

Published
2015
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3. Assessment of Electron-Cyclotron-Current-Drive-Assisted Operation in DEMO

Author

Marushchenko N.B., Figini L., Farina D., Zohm H., Tardini G., Fable E., Poli E., and Porte L.

Subjects
Physics, QC1-999
Abstract

The achievable efficiency for external current drive through electron-cyclotron (EC) waves in a demonstration tokamak reactor is discussed. Two possible reactor designs, one for steady state and one for pulsed operation, are considered. It is found that for midplane injection the achievable current drive efficiency is limited by secondharmonic absorption at levels consistent with previous studies. Propagation through the second-harmonic region can be reduced by moving the launch position to the high-field side (this can be obtained by injecting the beam from an upper port in the vacuum vessel). In this case, beam tracing calculations deliver values for the EC current drive efficiency approaching those usually reported for neutral beam current drive.

Published
2012
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4. The European Integrated Tokamak Modelling (ITM) effort: achievements and first physics results

Author

Falchetto, G.L., Coster, D., Coelho, R., Scott, B.D., Figini, L., Kalupin, D., Nardon, E., Nowak, S., Alves, L.L., Artaud, J.F., Basiuk, V., Bizarro, JoãoP.S., Boulbe, C., Dinklage, A., Farina, D., Faugeras, B., Ferreira, J., Figueiredo, A., Huynh, P., Imbeaux, F., Ivanova-Stanik, I., Jonsson, T., Klingshirn, H.-J., Konz, C., Kus, A., Marushchenko, N.B., Pereverzev, G., Owsiak, M., Poli, E., Peysson, Y., Reimer, R., Signoret, J., Sauter, O., Stankiewicz, R., Strand, P., Voitsekhovitch, I., Westerhof, E., Zok, T., Zwingmann, W., contributors, ITM-TF, Team, ASDEXUpgrade, Contributors, JET-EFDA, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Max-Planck-Institut für Plasmaphysik [Garching] (IPP), Instituto de Plasmas e Fusão Nuclear [Lisboa] (IPFN), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Consiglio Nazionale delle Ricerche [Roma] (CNR), European Fusion Development Agreement [Garching bei München] ( EFDA-CSU), Control, Analysis and Simulations for TOkamak Research (CASTOR), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Jean Alexandre Dieudonné (JAD), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Jean Alexandre Dieudonné (JAD), Association EURATOM-CEA (CEA/DSM/DRFC), Institute of Plasma Physics and Laser Microfusion [Warsaw] (IPPLM), Fusion Plasma Physics [Stockholm], Royal Institute of Technology [Stockholm] (KTH ), Poznan Supercomputing and Networking Center (PSNC), Ecole Polytechnique Fédérale de Lausanne (EPFL), Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], Culham Science Centre [Abingdon], Dutch Institute for Fundamental Energy Research [Nieuwegein] (DIFFER), Research & Innovation [Brussels], European Commission [Brussels], National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Jean Alexandre Dieudonné (LJAD), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Laboratoire Jean Alexandre Dieudonné (LJAD), ITM-TF Contributors, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, and JET-EFDA Contributors

Subjects
Nuclear and High Energy Physics, Tokamak, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, ASDEX Upgrade, law, Physics::Plasma Physics, Benchmark (surveying), 0103 physical sciences, Fysik, Aerospace engineering, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Physics, business.industry, turbulence, Magnetic confinement fusion, Fluid mechanics, Condensed Matter Physics, Data structure, simulation, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Workflow, Physical Sciences, integrated modelling, transport, code verification, Magnetohydrodynamics, business
Abstract

A selection of achievements and first physics results are presented of the European Integrated Tokamak Modelling Task Force (EFDA ITM-TF) simulation framework, which aims to provide a standardized platform and an integrated modelling suite of validated numerical codes for the simulation and prediction of a complete plasma discharge of an arbitrary tokamak. The framework developed by the ITM-TF, based on a generic data structure including both simulated and experimental data, allows for the development of sophisticated integrated simulations (workflows) for physics application.The equilibrium reconstruction and linear magnetohydrodynamic (MHD) stability simulation chain was applied, in particular, to the analysis of the edgeMHDstability of ASDEX Upgrade type-I ELMy H-mode discharges and ITER hybrid scenario, demonstrating the stabilizing effect of an increased Shafranov shift on edge modes. Interpretive simulations of a JET hybrid discharge were performed with two electromagnetic turbulence codes within ITM infrastructure showing the signature of trapped-electron assisted ITG turbulence. A successful benchmark among five EC beam/ray-tracing codes was performed in the ITM framework for an ITER inductive scenario for different launching conditions from the equatorial and upper launcher, showing good agreement of the computed absorbed power and driven current. Selected achievements and scientific workflow applications targeting key modelling topics and physics problems are also presented, showing the current status of the ITM-TF modelling suite. QC 20140505. Correction in: Nuclear Fusion, vol. 54, issue 9, Article Number. 099501WOS: 000341966700017, DOI: 10.1088/0029-5515/54/9/099501

Published
2014
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5. Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

Author

Figini, L., Decker, J., Farina, D., Marushchenko, N.B., Peysson, Y., Poli, E., Westerhof, E., and contributors, ITM-TF

Subjects
Engineering, Tokamak, Task force, business.industry, Nuclear engineering, Physics, QC1-999, Cyclotron, Mechanical engineering, Benchmarking, Electron, law.invention, law, Benchmark (computing), ____, Current (fluid), business
Abstract

A number of electron cyclotron codes have been developed in di erent Eu- ropean laboratories, to describe the behavior of EC waves in realistic tokamak plasma scenarios, and to optimize EC heating and current drive e ciency in present, and future devices like ITER. Moreover, integrated modelling is gaining popularity, since it seems to be the optimum approach for modelling tasks as complex as the assessment of future large devices performances. The outcome is presented here of a benchmark exercise for a set of EC codes, performed within the framework of the European Integrated Tokamak Mod- elling Task Force, and based on a standard ITER scenario, considering multiple launching conditions of the EC waves. The advantages o ered by integrated modelling are explored and exploited, and the sources of the small-but-still-present di erences among the various codes results are investigated.

Published
2012

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