Dr
Gary M. Staebler
(General Atomics)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Two important regimes, observed in non-linear gyrokinetic turbulence simulations, are not well modeled by the TGLF quasilinear model. The first is the Dimits shift regime characterized by a non-linear upshift in the effective critical ion temperature gradient above the linear threshold. The second is the electron temperature gradient (ETG) streamer regime characterized by high electron scale...
Dr
Robert Hager
(Princeton Plasma Physics Laboratory)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Based on the kinetic simulations with the new gyrokinetic neoclassical code XGCa in realistic magnetic separatrix geometry, we developed an improved bootstrap current formula [R. Hager, C.S. Chang, submitted to Phys. Plasmas (2015)] that is much more accurate in steep edge pedestal plasma than the widely used formula by Sauter et al. [O. Sauter et al., Phys. Plasmas 6, 2834 (1999)] while being...
Dr
Robert Budny
(Princeton University)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Experiments to detect alpha heating were performed in TFTR (1994) [1] and in JET (DTE1 1997 [2]. The TFTR results were claimed to be consistent with alpha particle heating of electrons. The JET results were claimed to show that alpha particle heating had been unambiguously observed. Recent papers [3,4] reanalyzed the alpha heating and other discharges from the JET DTE1 using improved TRANSP...
Dr
Zixi Liu
(Princeton Plasma Physics Laboratory / Institute of Plasma Physics, Chinese Academy of Sciences)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The weakly coherent mode (WCM) in I-mode has been studied by six-field two-fluid model based on the Braginskii equations under the BOUT++ framework. The calculations indicate that a tokamak pedestal exhibiting a WCM is unstable to drift Alfven wave (DAW) instabilities and resistive ballooning mode. The nonlinear simulation shows promising agreement with the experimental measurements of WCM....
Dr
Masanori Nunami
(National Institute for Fusion Science)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Gyrokinetic and drift kinetic simulations are carried out to investigate anomalous and neoclassical transport of hydrogen isotope and impurity ions in Large Helical Device (LHD) plasmas.
Turbulent transport in high electron temperature regime, where the trapped electron mode (TEM) is dominant, is a critical issue for future burning plasmas. To clarify an impact of hydrogen isotope species on...
Dr
Nobuhiko Hayashi
(Japan Atomic Energy Agency)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The integrated modeling code TOPICS has been extended to couple impurity transports in core and scrape-off-layer / divertor regions, and applied to predictive modeling of JT-60SA high-beta steady-state plasma with the accumulation of impurity seeded to reduce divertor heat load. Consistent evaluation of impurity transport from the edge to the core clarified the compatibility of impurity...
Dr
Jeff Candy
(General Atomics)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Development of a validated integrated modeling framework is a fundamental research task within the US fusion energy program. A primary component of this framework is an accurate transport model describing the small-scale, gradient-driven plasma microturbulence and its associated cross-field transport. Design and calibration of accurate transport models requires a database of well-converged...
Dr
Sun Hee KIM
(ITER Organization)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Non-activation phase H/He operations in ITER will be important for commissioning of tokamak systems, such as diagnostics, heating and current drive (HCD) systems, coils and plasma control systems, and for validation of techniques necessary for establishing feasible operations. The assessment of feasible HCD schemes at various toroidal fields (2.65-5.3T) has revealed that the previously applied...
Sumire Kobayashi
(FrLPP, FrCNRS)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The interaction between spontaneously formed zonal flows and small-scale turbulence in nonlinear gyrokinetic simulations is explored in a shearless closed field line geometry. It is found that when clear limit cycle oscillations prevail, the observed turbulent dynamics can be quantitatively captured by a simple Lotka-Volterra type predator-prey model. Fitting the time traces of full...
Dr
Gloria Falchetto
(CEA)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Recent developments and achievements of the EUROfusion Code Development for Integrated Modelling project (WPCD, follow-up of EFDA-ITM-TF), which aims at providing a validated integrated modelling suite for the simulation and prediction of complete plasma discharges in any tokamak, are presented. WPCD develops generic complex integrated simulations, workflows, for physics applications, using...
Dr
Sujin Suwanna
(Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Predictive capability of hydrogenic density and impurity density in L and H-mode plasma is strongly desirable to fully understand behaviors of plasma in tokamak, which can exhibit many modes of transports depending on the conditions of plasma. Combining many modes from turbulent transports, the Multi-Mode Model version 1995 (MMM95) includes coefficients from the Weiland model for the ion...
Dr
Alexei Pankin
(Tech-X Corporation)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The Multi-Mode Model (MMM7.1) for anomalous transport [1] is tested in predictive modeling of temperature profiles of high beta poloidal DIII-D discharges. This new H-mode plasma regime, with high beta poloidal and high plasma currents, has been studied in DIII-D tokamak discharges [2]. The MMM7.1 anomalous transport model includes a combination of contributions based on different transport...
Mr
Manaure Francisquez
(Dartmouth College)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
A study of L and H mode-like plasma turbulence in the edge of tokamaks is presented, with an emphasis on characterization of these plasmas in numerical simulations with a new Global Drift-Ballooning (GDB) model. This work employs drift-reduced Braginskii two-fluid equations for electromagnetic low-frequency turbulence and solves them in a global large-aspect ratio annulus centered on the last...
Dr
Shinya Maeyama
(Nagoya University)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Most previous studies on plasma turbulence have assumed scale separation between electron-scale (~ electron gyro-radius) and ion-scale turbulence (~ ion gyro-radius). However, multi-scale turbulence studies by using the latest supercomputers indicated existence of cross-scale interactions and its significant impact on turbulent transport, and are necessary for explaining experimental transport...
Prof.
Yong Xiao
(Institute for Fusion Theory and Simulation)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
It has been recently discovered that the trapped electron mode (TEM) may play an important role in the H mode edge plasma for domestic tokamaks such as EAST and HL-2A. The stability and transport for TEM for the edge parameters are studied using large scale gyrokinetic particle simulations. The gyrokinetic simulation reveals the parametric dependences on the wavelength, collisionality and the...
Dr
Sumin Yi
(National Fusion Research Institute, Daejeon, Republic of Korea)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The so-called “spontaneous” or “intrinsic” rotation driven by ion-scale turbulence has been widely observed in tokamaks. If we turn our attention to the electron parallel momentum balance, it is likely that electron-scale turbulence, e.g. electron temperature gradient (ETG) turbulence, can modify the Ohm’s law, hence providing a current source. However, there has been no serious study of an...
Dr
Ihor Holod
(University of California Irvine)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Present understanding of ELM triggering mechanism is mostly based on the peeling-ballooning theory (PBT) often providing sufficiently good pedestal prediction. While PBT is rather empirical, the more comprehensive kinetic description is still required.
In this work we present recent gyrokinetic simulations aimed to identify electromagnetic microinstabilities in the H-mode pedestal region of...
Dr
Mike Kotschenreuther
(Institute for Fusion Studies)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
For the first time, electromagnetic gyrokinetic simulations of pedestal transport are reported (inter-ELM). For the JET-ILW (ITER Like Wall) pedestal, nonlinear simulations show that Micro-Tearing Mode (MTM) turbulence produces the bulk of the transport in the steep gradient region, and the combination of MTM, electron temperature gradient (ETG), ion-scale electrostatic turbulence and...
Dr
Sadayoshi Murakami
(Departement Nuclear Engineering, Kyoto University)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The deuterium experiment project from 2017 is planned in LHD, where the deuterium NBI heating beams with the power more than 30MW are injected into the deuterium plasma. Principal objects of this project are to clarify the isotope effect on the heat and particle transport in the helical plasma and to study energetic particle confinement in a helical magnetic configuration measuring triton...
Dr
Michele Romanelli
(UK Atomic Energy Authority)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Along with the construction and operation of ITER, the design of a demonstration thermonuclear fusion reactor (DEMO) is the main goal of current international fusion research. New generation of tokamaks as JT-60SA are meant to provide important information to allow discriminating between different DEMO designs. In particular JT-60SA will explore the possibility of running steady state plasma...
Dr
Elina Militello Asp
(CCFE)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The evolution from X-point formation of ITER H, He and DT plasmas with gas and/or pellet fuelling has been studied for the first time self-consistently with the integrated core and edge suite of codes JINTRAC developed at JET. Our results show that understanding how to optimise fuelling performance is vital to operate ITER and to achieve high fusion yield without exceeding operational limits...
572.
Multi-species ITG-TEM driven turbulent transport of D-T ions and He-ash in ITER burning plasmas
Dr
Motoki Nakata
(National Institute for Fusion Science)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Burning plasmas are composed of multiple ion species such as fuel isotopes(D and T) and He-ash produced by the fusion reaction, and more complex turbulent transport processes are expected in comparison to the single-ion plasmas. Since simultaneous measurements of the kinetic profiles for all species are limited even in experiments, systematic studies on the particle and heat transport by the...
Dr
Tariq Rafiq
(Lehigh University)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Microtearing modes (MTMs) have been identified as a source of significant electron thermal transport in high β tokamak discharges. A model for MTMs that can be installed in integrated whole device predictive modeling codes is needed in order to improve the prediction of electron thermal transport and, consequently, the evolution of the plasma in devices in which MTMs have a significant role. A...
Prof.
Yong-Su Na
(Seoul National University)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
We report present status and main results of the ITPA IOS Topical Group activity on the benchmarking of simulations of the core particle transport in ITER baseline ELMy H-mode scenario with the integrated codes which are presently used for the ITER scenario simulations. The ITPA IOS group is pursuing particle transport as an important component of integrated modelling, because the simulations...
Dr
Jin Yong Kim
(National Fusion Research Institute, Korea (south))
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
As an effort to clarify the physics origin of the global scaling laws of energy confinement time, a new analysis scheme is first proposed in which the total stored energy is divided into the two parts, one being almost directly decided by the marginal stability property and edge boundary condition through profile stiffness and the other by the profile deviation from marginal one through...
Dr
thawatchai Onjun
(Sirindhorn International Institute of Technology)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The deuterium and tritium are considered as a fuel for nuclear fusion reactors in the future fusion machine, like ITER and DEMOs. Generally, deuterium is applied by gas puffing or pellet injection; whereas tritium can be internally produced from a blanket of reactors, which relies on reactions between 14.1 MeV neutrons from nuclear fusion reactions and lithium as one composite of the blankets....
Dr
Simon Pinches
(ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul-lez-Durance Cedex, France)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The ITER Integrated Modelling (IM) Programme will not only support the ITER Project in the development and execution of the ITER Research Plan (IRP) but also provide support for the design basis of the ITER facility during construction, in particular for diagnostics. Strategically, the ITER IM Programme is implemented using expertise and technologies developed within the ITER Members’ research...
Dr
Clemente Angioni
(Max-Planck-Institut fuer Plasmaphysik)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The validation of current models to predict the transport of a heavy impurity like tungsten in tokamaks is confronted with challenges from both the theoretical and experimental standpoints. Both neoclassical and turbulent transport mechanisms are involved, and have to take into account the impact of poloidal asymmetries, produced by both centrifugal effects and temperature anisotropies caused...
Dr
Irina Voitsekhovitch
(CCFE)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Integrated Modelling (IM) of present experiments and future tokamak-reactor requires numerical tools which can describe spatially small-scale and large-scale phenomena as well as dynamically fast transient events and relatively slow plasma evolution within a reasonably fast computational time. The progress in the optimisation and speed-up of the EU first-principle codes and in the development...
Dr
Nopporn Poolyarat
(Department of Physics, Faculty of Science and Technology, Thammasat University, THAILAND)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
In this work, a simulation of neoclassical tearing mode (NTM) in JET experiments is considered using a 1.5D BALDUR integrated predictive modeling code with an improved ISLAND. An original ISLAND module [1] for calculating the saturated width of magnetic island caused by a magnetic reconnection is obtained from the NTCC Library [2]. This ISLAND module is then modified to improve a consistency...
Dr
Hyun-Tae Kim
(EUROfusion Consortium JET)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The EUROfusion Consortium is planning deuterium-tritium (D-T) experimental campaigns in 2019 on JET with the ITER-Like Wall (ILW) to address physics issues which are important for ITER-D-T experiments. To achieve the scientific objectives, JET operation should demonstrate 10-15MW of fusion power for at least 5 seconds, a performance never attempted before in fusion-research history. The...
Dr
Mikhail Tsventoukh
(Lebedev Physical Institute RAS)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The formation of large stable plasma gradients, e.g. in form of internal transport barriers, being of a strong both practical and fundamental interest. Normally the larger the gradient the larger the transport, and any deviation due to collective plasma behavior is of great interest.
We have predicted theoretically that there is a strong stabilizing action against convective...
Dr
Apiwat Wisitsorasak
(King Mongkut's University of Technology Thonburi)
18/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Simulations of the plasma in the core and the scrape-off layer (SOL) region are carried out using 1.5D BALDUR integrated predictive modeling code to investigate tokamak plasmas in TFTR reactor operating in low confinement mode (L-mode). In each simulation, the plasma current, temperatures, and density profiles in both core and SOL regions are evolved self-consistency. The plasma profiles in...
