Dr
Hiroyasu Tanigawa
(Japan Atomic Energy Agency)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
International Fusion Energy Research Centre (IFERC) has implemented DEMO research and development activities for 10 years under the Broader Approach (BA) activity. Five common issues on blanket technologies were selected and corresponding R&D has been carried out. The accomplishments of R&D were; successful production of reduced activation ferritc/martensitic steel in DEMO scale production...
Dr
Yusuke Shibama
(Japan Atomic Energy Agency)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
The JT-60SA (JT-60 Super Advanced) project is a combined project of Japan’s program for national use and the Japan-EU Satellite Tokamak Program collaboration between Japan and the EU fusion community. The main objectives are to demonstrate steady-state high-beta plasma and to support ITER through the optimization of ITER operation scenario. The JT-60SA tokamak device is designed as a...
Dr
Bernhard Sieglin
(Max-Planck-Institut for Plasma Physics)
21/10/2016, 14:00
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Poster
Studies of the steady state scrape-off layer heat transport with and without external magnetic perturbation in ASDEX Upgrade L-Mode are shown.
It is found that the heat transport perpendicular to the magnetic field is within the uncertainty unaffected by external magnetic perturbation.
The observed heat flux pattern is explained by heat flux calculations using the vacuum field of the...
Dr
Richard Kemp
(Culham Centre for Fusion Energy)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
Although the ultimate goal of most current fusion research is to build an economically attractive power plant, the present status of physics and technology does not provide the performance necessary to achieve this goal. Therefore, in order to model how such plants may operate and what their output might be, extrapolations must be made from existing experimental data and technology. However,...
Dr
Christopher Holland
(University of California San Diego)
21/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
New experimentally validated simulations demonstrate for the first time that the turbulent transport that sets tokamak confinement is robustly multiscale across a variety of reactor-relevant regimes, with significant nonlinear cross-scale couplings that must be accurately described to correctly predict ITER performance. These gyrokinetic and gyrofluid simulations of electron transport...
Dr
Orso Meneghini
(General Atomics)
21/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
Accurate predictions of fusion performance requires including the strong interplay that exists between core transport, pedestal structure, current profile and plasma equilibrium. An integrated modeling workflow capable of finding the steady-state self-consistent solution to this strongly coupled problem has been developed. The workflow, leverages first principles calculations and does not...
Mr
Jisung Kang
(Seoul National University)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
A systematic, self-consistent process to find the K-DEMO operation scenario has been investigated. Recent progress on K-DEMO scenario study explored zero-dimensional operation regime and one-dimensional current density configurations with fixed safety factor profile [1]. However, previous researches do not contain confinement optimization process for stable equilibria. In this study, an...
Prof.
Hidetoshi Hashizume
(Tohoku University)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
This study addresses development of mechanical joints and a heat removable technique for the remountable HTS magnet. We carried out (i) Optimizing structure and fabrication procedure of mechanical joints, and (ii) Analyzing heat transfer performance of metal porous media inserted channel to be applied to thermal analysis of joint. The developments and discussion will be taken into account in...
Dr
Jeronimo Garcia
(CEA IRFM)
21/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
The thermal energy confinement time has been observed to largely vary with the exchange of the main isotope in broad experimental conditions in magnetically confined plasmas, leading to the so called isotope effect. Of particular interest is the isotope exchange between the fusion of deuterium-deuterium (DD) and deuterium-tritium (DT) nuclei, studied in dedicated experiments performed in the...
Dr
Alexis Briesemeister
(ORNL)
21/10/2016, 14:00
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Poster
In DIII-D, measurements show that at high densities, above the onset of divertor detachment, the non-axisymmetric heat flux striations between ELMs created by resonant magnetic perturbation (RMP) fields are eliminated and the heat flux profile is nearly identical to that measured without RMPs. Measurements show that the RMPs continue to affect the particle balance even when there were no...
Dr
Pierluigi Bruzzone
(EPFL-CRPP)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
High Temperature Superconductors (HTS) may become in future an option for the superconducting magnets of commercial fusion plants. The general requirements for HTS conductors and coils are presented together with a tentative roadmap for the related R&D activity. The issue of the material cost and its evolution is also discussed in comparison to the Low Temperature Superconductors (LTS) option....
Dr
Gregory Wallace
(MIT Plasma Science and Fusion Center)
21/10/2016, 14:00
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Poster
Experimental and modeling results from Alcator C-Mod and NSTX show that details of the scrape off layer (SOL) can significantly impact the effectiveness of radio frequency (RF) heating and current drive actuators. C-Mod experiments show that cold, dense conditions in the SOL lead to significant collisional absorption of lower hybrid (LH) waves outside the last closed flux surface (LCFS),...
Dr
Deliang Yu
(Southwestern Institute of Physics)
21/10/2016, 14:00
EXC - Magnetic Confinement Experiments: Confinement
Poster
Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the q = 1 surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal that...
Dr
Patrick Decool
(CEA)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
In 2005, when the ITER site decision was made, the French Government decided to participate to the joint Europe-Japan implementation of the so-call “Broader Approach Activities” (BA) in support of the ITER project and DEMO activities [1,2]. The BA comprises the ITER Satellite Tokamak Programme (STP) which consists in upgrading the JT-60U machine into the largest fully superconducting and...
Prof.
Kazuya Takahata
(National Institute for Fusion Science)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
The Large Helical Device (LHD) superconducting magnet system consists of two pairs of helical coils and three pairs of poloidal coils. The helical and poloidal coils use composite conductors with pool cooling by liquid helium, and cable-in-conduit (CIC) conductors with forced cooling by supercritical helium, respectively. The poloidal coils were first energized with the helical coils on March...
Dr
Maiko Yoshida
(National Institutes for Quantum and Radiological Science and Technology)
21/10/2016, 14:00
EXC - Magnetic Confinement Experiments: Confinement
Poster
Negative magnetic shear has been demonstrated to mitigate the confinement degradation typically observed with increasing the electron to ion temperature ratio (Te/Ti), and the mechanisms are now understood in terms of fluctuation measurements and gyrokinetic (GK) simulations in DIII-D steady-state plasmas. The impact of Te/Ti on plasma transport and confinement is a critical issue for ITER and...
Dr
Akihiro Ishizawa
(Kyoto University)
21/10/2016, 14:00
THC - Magnetic Confinement Theory and Modelling: Confinement
Poster
As a trial in evaluating helical system designed with different concepts, we have compared two devices, the Large Helical Device (LHD) and the Heliotron J (HJ), with different magnetic field structure under two key parameters, i.e. the Mercier/interchange measure D_well and the magnetic shear s_hat, focusing on their linear drift wave instability and nonlinear evolution leading to turbulent...
Dr
Paul Bonoli
(Massachusetts Institute of Technology)
21/10/2016, 14:00
THD - Magnetic Confinement Theory and Modelling: Plasma–material interactions; divertors, limiters, SOL
Poster
High field side (HFS) launch of RF power in the ion cyclotron range of frequencies (ICRF) and the lower hybrid range of frequencies (LHRF) in double null configurations in reactor grade plasmas is studied and found to represent an integrated solution that both mitigates PMI / coupling problems and at the same time opens up the possibilities of greatly improved core wave physics
Power exhaust...
Dr
Tetsutarou Oishi
(National Institute for Fusion Science)
21/10/2016, 14:00
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Poster
Stochastization of edge magnetic fields has been extensively studied not only for the ELM mitigation but also for the plasma detachment and the impurity transport. Large Helical Device (LHD) has a thick stochastic magnetic field layer called “ergodic layer” located at the edge plasma with three-dimensional structure intrinsically formed by helical coils. Recently, reduction of the parallel...
Dr
Ryoji Hiwatari
(Japan Atomic Energy Agency)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
This paper presents the recent progress of a conceptual DEMO design in Japan. First, the divertor concept is built under the feasible engineering technology. Second, the circulating power in DEMO is precisely investigated as for the cooling power and the water detritiation system to ensure the substantial net electric power. Then, 3D eddy current analysis shows the prospect for plasma...
Dr
Nirmal Kumar Bisai
(Institute for Plasma Research, Bhat, Gandhinagar-382428, India)
21/10/2016, 14:00
THD - Magnetic Confinement Theory and Modelling: Plasma–material interactions; divertors, limiters, SOL
Poster
Role of neutral gas in Scrape-off Layer (SOL) of tokamak plasma is important as it modifies the plasma turbulence. This has been investigated using a simple two-dimensional (2D) model that consists of electron continuity, quasi-neutrality, electron energy and neutral gas continuity equations. Earlier the role of the neutral gas has been studied using uniform electron temperature [1]. However,...
Prof.
Akio Sagara
(National Institute for Fusion Science)
21/10/2016, 14:00
FIP - Fusion Engineering, Integration and Power Plant Design
Poster
The Fusion Engineering Research Project (FERP) in NIFS is conducting the conceptual design activity of the LHD-type helical fusion reactor FFHR-d1A. Recently, two options of “basic” and “challenging” have been newly defined. Conservative technologies including what will be demonstrated in ITER are chosen in the basic option, while new ideas that would possibly be beneficial for making the...
Mr
B.A. Grierson
(Princeton Plasma Physics Laboratory)
21/10/2016, 14:00
EXC - Magnetic Confinement Experiments: Confinement
Poster
Experiments in DIII-D have validated advanced models of main-ion intrinsic rotation and used dimensionless parameter scans to predict a significant amount of intrinsic torque in ITER. Recent measurements of deuterium toroidal rotation using main ion spectroscopy in DIII-D have validated predictions of Reynolds stress induced toroidal flow in the plasma core and rotation induced by ion orbit...
