Mr
Shigeru Inagaki
(Japan)
10/12/12, 2:00 PM
Poster
Here we report dynamic response of micro-fluctuations and turbulent flux to a low frequency heat wave induced by the ECH modulation and development of observation of low frequency fluctuation with long distance radial correlation length comparable to the plasma radius (long-range mode) in LHD. A low frequency global wave is excited by central ECH power modulation at 25 Hz. The typical...
Ms
Teresa Estrada
(Spain)
10/12/12, 2:00 PM
Poster
The spatiotemporal behaviour of the interaction between turbulence and flows has been studied close to the L-H transition threshold conditions in the edge region of TJ-II plasmas. The temporal dynamics of the interaction displays an oscillatory behaviour with a characteristic predator-prey relationship. This intermediate oscillatory transient stage has been seen in L-H transition experiments...
Mr
George TYNAN
(USA)
10/12/12, 2:00 PM
Poster
The kinetic energy transfer between shear flows and the ambient turbulence is measured for the first time in the EAST, DIII-D and HL-2A tokamaks. In EAST as the plasma is heated and approaches the L-H transition, the rate of energy transfer from the turbulence into the zonal flow increases. Finally, when this rate becomes comparable to the energy input rate into the turbulence, the...
Mr
Guosheng Xu
(China)
10/12/12, 2:00 PM
Poster
Small-amplitude edge localized oscillations have been observed, for the first time, in EAST preceding the L-H transition at marginal input power, which manifest themselves as dithering in the divertor Dalpha signals at a frequency under 4 kHz, much lower than the GAM frequency. Detailed measurements using two toroidally separated reciprocating probes inside the separatrix demonstrate a...
Mr
Rajesh Maingi
(USA)
10/12/12, 2:00 PM
Poster
The understanding of regimes with 1) high pressure at the top of the H-mode pedestal, and 2) devoid of large ELMs is important for scenario optimization of ITER and future devices. Lithium wall coatings have been shown to both improve energy confinement and eliminate ELMs in NSTX. Here, we present analysis of variable pre-discharge lithium evaporation from multiple experiments, for more...
Mr
Hyeon Keo Park
(Republic of Korea)
10/12/12, 2:00 PM
Poster
The nature of the Edge Localized Mode (ELM) in the H-mode regime in toroidal plasmas is complex and therefore requires advanced diagnostic tools in order to enhance the understanding of the physical dynamics. It is particularly important to find a comprehensive way to eliminate or suppress this instability which is a critical issue for H-mode operation in ITER and DEMO. There have been...
Mr
Richard J. Groebner
(General Atomics)
10/12/12, 2:00 PM
Poster
Joint experiment/theory/modeling research has led to increased confidence in predictions of the pedestal height in ITER. This work was performed as part of a US DOE Joint Research Target in FY2011 to identify physics processes to control the H mode pedestal structure. This work included experiments on C-Mod, DIII-D and NSTX as well as interpretation of experimental data with theory-based...
Mr
Yasuhiro Suzuki
(Japan)
10/12/12, 2:00 PM
Poster
In the LHD experiments, the volume averaged beta value was achieved to 5% in the quasi-steady state. For such high-beta plasmas, the change of the magnetic field structure is expected. Since the magnetic field of the LHD is intrinsically 3D structure, the plasma current flowing along 3D field lines drives perturbed field to break nested flux surfaces for the vacuum field, so-called the "3D...
Mr
Yasushi Ono
(Japan)
10/12/12, 2:00 PM
Poster
The high-power reconnection heating of spherical tokamak (ST) has been studied in TS-3 merging experiment as a promising solenoid (CS)-less startup and also as a new type of efficient heating method. Our 2-D measurements of plasma flow, magnetic field, ion temperature T_i and electron density has first verified the mechanism of merging formation of the high-beta ST with significant ion heating...
Mr
Vasily Gusev
(Russian Federation)
10/12/12, 2:00 PM
Poster
The spherical tokamak Globus-M has largely reached its projected parameters. Some of the deficiencies, which do not allow to cross the present operational range have been identified. The experimental basis and the recognition of the reasons for limitations form the basis for the parameter definition of the next step, Globus M2. In this paper we report on the major findings on Globus-M...
Mr
Michael Lehnen
(Germany)
10/12/12, 2:00 PM
Poster
Disruptions are a critical issue for ITER because of the high thermal and magnetic energies that are released on short time scales, which results in extreme forces and heat loads. This contribution reports on disruption properties with the new ITER-like wall (ILW) in JET. It is shown that the material of the plasma-facing components (PFC) has significant impact on the disruption loads. The...
Mr
Eric M. Hollmann
(USA)
10/12/12, 2:00 PM
Poster
High-current (multi-MA) runaway electron (RE) beams could form in ITER during disruptions or rapid shutdowns. To avoid localized wall damage, it is crucial to understand how these RE beams are lost and how they can be controlled and dissipated. DIII-D dedicated experiments on rapid shutdown REs have improved understanding of the processes involved in RE formation, control, dissipation, and...
Mr
Stefan Gerhardt
(USA)
10/12/12, 2:00 PM
Poster
Disruptions in next-step tokamak devices, whether at conventional or low aspect ratio, must be rare, predictable, and have minimal consequences for the plant. This paper addresses these issues using data the National Spherical Torus Experiment (NSTX). The disruptivity increases rapidly for q*<2.5, but does not show a strong dependence on βN; more complicated physics such as kinetic...
Mr
Pejman Khorshid
(Iran)
10/12/12, 2:00 PM
EXC - Magnetic Confinement Experiments: Confinement
Poster
The Experimental studies during externally applied resonant helical magnetic field (RHF) perturbation in IR-T1 tokamak have been investigated. The experiments have been done in various directions of plasma current and toroidal magnetic field to finding the role of Ip and Bt direction in RHF application. The Morlet wavelet spectra, Fourier coefficient decomposition (FCD) and Singular value...
Mr
Nicola Vianello
(Italy)
10/12/12, 2:00 PM
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Poster
In present fusion research strong effort is devoted to the studies of the effects of non-axisymmetric magnetic perturbation or magnetic field ergodization on the external region of the plasma. On this topic interesting results can be drawn from the helical configuration observed in high-current regimes in RFPs where a helical core is surrounded by an almost quasi-symmetric boundary and the...
Mr
Gianluca Pucella
(Italy)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
One of the main problems in tokamak fusion devices concerns the capability to operate at high plasma density, that is observed to be limited by the appearance of catastrophic events causing loss of plasma confinement. The commonly used empirical scaling law for the density limit is the Greenwald limit, predicting that the maximum achievable line averaged density along a central chord depends...
Mr
Andrea Murari
(Italy)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Disruptions are unavoidable in current Tokamaks and accurate and reliable predictions are a prerequisite to any mitigation strategy. Therefore the most recent efforts in data analysis and machine learning have concentrate on the one hand on improving the success rate of predictors and on the other hand on developing tools which can help in the understanding of disruption physics. The best...
Mr
Vladislav V. Plyusnin
(Portugal)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Latest disruption experiments in JET with carbon-fibre composite (CFC) in plasma facing components (PFC) have been carried out using either Massive Gas Injection or constant puff. These studies provided new data and further update of the database on disruption generated runaway electrons (RE). Temporal and spatial dynamics of RE beams have been studied using inverse reconstruction of the...
Mr
Francois SAINT-LAURENT
(France)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Runaway electrons (RE) generated during disruption are identified as a major issue for ITER. Mitigation techniques are thus mandatory to suppress RE formation or/and reduce their heat loads. Two ways are explored on Tore Supra:
- Suppress the RE beam formation and avalanche amplification by multiple gas jet injections at current quench (CQ).
- Control the RE beam when it is formed and...
Mr
John Berkery
(USA)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Global MHD instabilities may disrupt operation of ITER and other future tokamaks. The National Spherical Torus Experiment (NSTX) has previously investigated passive stabilization and demonstrated active control of resistive wall modes (RWMs), accessing high BetaN = 7.2. Current research focuses on greater understanding of the stabilization physics, projection to future devices, quantitative...
Mr
Francesco A. Volpe
(USA)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Magnetic perturbations were used to control the rotation and toroidal phase of locked modes (LMs) and of their rotating precursors, when present, thus enabling the first full suppression of locked modes (LMs) by modulated or continuous Electron Cyclotron Current Drive (ECCD). In a first set of experiments the applied perturbations were static and caused the rotating precursor to directly lock...
Mr
Robert Granetz
(USA)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Massive gas injection (MGI) disruption mitigation experiments have shown that this technique can quickly convert a large fraction of plasma thermal and magnetic energy into radiated power. To date, gas has been injected from a single spatial location, and bolometric measurements have shown that the resulting radiated power is often toroidally asymmetric, which could cause melting of beryllium...
Mr
Kazunobu Nagasaki
(Japan)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Second harmonic electron cyclotron current drive (ECCD) has been applied in the Stellarator/Heliotron device, Heliotron J, to control rotational transform profile. Localized EC driven current at central region changes the rotational transform, making a high magnetic shear. An energetic-ion-driven MHD mode of 80 kHz has been completely stabilized when the counter EC current of more than 2 kA is...
Mr
JaeChun Seol
(Republic of Korea)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
The magnitude of toroidal rotation velocity is reduced by electron cyclotron resonance heating (ECRH) or ion cyclotron resonance frequency (ICRF) regardless of the direction of toroidal rotation. This can be explained by the neoclassical toroidal viscosity (NTV) by MHD activities. Toroidal rotation changes due to ECRH have been observed in many devices such as DIII-D, JT-60U and ASDEX-Upgrade....
Ms
Gabriella Pautasso
(IPP, Garching, Germany)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Experiments of massive gas injection (MGI) in existing tokamaks have shown that this technique is suitable for disruption mitigation. A reduction of the localized heat load on the divertor is easily achieved by increasing the fraction of radiated energy with impurity injection. A reduction of the vertical force on the vessel is accomplished when the current quench duration is reduced with...
Mr
Yong-Su Na
(Republic of Korea)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
Tearing mode (TM), a type of current-driven resistive instability was observed in L-mode plasmas during 2011 campaign of KSTAR. It was usually observed in discharges with the magnetic perturbation (MP) intended to suppress edge localized mode (ELM). When with n = 1 MP, TM was appeared just after ramping down of the MP coil current. There are two electron cyclotron heating and current drive...
Mr
Junghee Kim
(Republic of Korea)
10/12/12, 2:00 PM
EXS - Magnetic Confinement Experiments: Stability
Poster
It has been found that toroidally rotating plasmas exhibit beneficial effects such as suppression or reformation of magnetohydrodynamic (MHD) instabilities. In KSTAR plasmas, it is found that sawtooth period lengthens significantly as the toroidal rotation speed increases. Stability analysis reveals the critical rotation speed to reach the marginal stability, suppressing the growth of the...
Mr
Xuru Duan
(China)
10/12/12, 2:00 PM
EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles
Poster
Runaway electron (RE) is a crucial issue in achieving safe tokamak operation due to its sever threat to tokamak machines when they hit the first wall, especially during disruptions. Therefore, investigations on the behaviour of REs and the evolution of disruption generated RE beam have been a very active area during the past decades. Anomalous RE enhancement has been recently observed in...
Mr
Thomas Jarboe
(USA)
10/12/12, 2:00 PM
ICC - Innovative Confinement Concepts
Poster
Efficient current drive and profile control are primary goals of the Helicity Injected Torus (HIT) current drive program. With the achievement of greatly improved parameters on HIT-SI came the discovery of Imposed Dynamo Current Drive (IDCD) a method of efficiently sustaining a stable equilibrium with the possibility of current profile control. A model of IDCD, which predicts the current ramp...
Mr
Masayoshi Nagata
(Japan)
10/12/12, 2:00 PM
ICC - Innovative Confinement Concepts
Poster
The double pulsing Coaxial Helicity Injection (CHI) on HIST has regenerated toroidal currents up to 80 kA against resistive decay. The internal magnetic field measurements have verified the flux amplification and the formation of the closed flux surfaces after the second CHI pulse. The poloidal flux increases proportionally with the toroidal current as increasing the toroidal field coil...
Mr
Paul Bellan
(USA)
10/12/12, 2:00 PM
ICC - Innovative Confinement Concepts
Poster
The Taylor relaxation theory prediction that there exists a unique minimum-energy state towards which a magnetized plasma invariably relaxes has applicability to magnetic fusion confinement (spheromaks and RFP’s), the solar corona, and certain astrophysical plasmas. While Taylor theory predicts the minimum-energy end state reasonably well, it does not even attempt to describe what actually...
470.
ICC/P8-02: Observation of Magnetic Fluctuations and Disruption of Magnetospheric Plasma in RT-1
Mr
Haruhiko Saitoh
(Japan)
10/12/12, 2:00 PM
ICC - Innovative Confinement Concepts
Poster
The Ring Trap 1 (RT-1) device is a magnetospheric levitated dipole field configuration constructed for the study of high-beta plasma suitable for burning advanced fuels. As observed in planetary magnetospheres, dipole plasmas can be stable against MHD interchange and ballooning instabilities even in bad curvature regions, due to the effects of field lines compressibility. In the first series...
Mr
Egemen Kolemen
(USA)
10/12/12, 2:00 PM
Poster
Real time steerable electron cyclotron current drive (ECCD) has been demonstrated to reduce the power requirements and time needed to remove 3/2 and 2/1 neoclassical tearing modes (NTM) in the DIII-D tokamak. In a world first demonstration of the techniques required in ITER, the island formation onset is detected automatically, gyrotrons are turned on, and the real-time steerable ECCD launcher...
Mr
Yican Wu
(China)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
The world needs a great deal of carbon-free energy for civilization to continue. Nuclear power is attractive for helping cut carbon emissions and reducing imports of fossil fuel, but the low utilization of nuclear resource and hard to processing of spent fuel from nuclear power plant are now the key issues for nuclear development. Subcritical system which including Fusion Driven subcritical...
Mr
Italo Ricapito
(Spain)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Through the planned experimental campaign on the Test Blanket Systems (TBS), ITER will be an unique technological platform to assess the performance of different breeding blanket concepts for DEMO and power reactors. Two European TBSs are going to be tested in ITER, based on HCLL (Helium Cooled Lithium Lead) and HCPB (Helium Cooled Pebble Bed) breeding blanket concepts. In both cases the TBM...
Mr
Meng Wang
(China)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Based on volume ignition idea and innovative design of ignition target, which adapt to process of Z-pinch，a new fusion-fission hybrid reactor concept design was advanced by academician Peng of CAEP. Compares with pure-fission approach, the demands of pulsed power driver can reduce significantly for that, Z-pinch ICF is used only for high energy neutron source and main energy is exported in...
Mr
George Miley
(University of Illinois)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Fast Ignition is recognized as the most promising approach to achieving the high energy gain target performance needed for commercial inertial confinement fusion (ICF). However, there are a number of physics issues related to the traditional approach of using a petawatt laser to generate a relativistic electron beam that should penetrate and focus on the hot "spark" region of the compressed...
Mr
Alexander Melnikov
(Russian Federation)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
The new experimental observations of plasma potential by a Heavy Ion Beam Probe diagnostic and theoretical description of the formation of E(r) in the T-10 (circular tokamak, B(0)=1.5-2.5 T, R=1.5 m, a=0.3 m) are presented. OH deuterium plasmas (n(е) = 0.6-4.7x10^19 m^–3, T(e) < 1 keV, T(i) < 0.6 keV) are characterized by a negative potential up to phi(0) =-1300 V. The potential profile is...
Mr
Kevin Freudenberg
(Oak Ridge National Laboratory)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
The ITER Central Solenoid (CS) is comprised of six independent coils held together by a pre-compression support structure. The solenoid is supported from the bottom of the toroidal field (TF) coil casing in both the vertical radial directions by a unique vertical flex plate design. This design provides the needed radial flexibility, as the two systems move with respect to one another, while...
Mr
William Hornsby
(Germany)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Islands in the magnetic field topology generated by the Neoclassical tearing mode (NTM) represent a serious concern for a tokamak reactor as they can act as a trigger of disruption events and limit the achievable plasma pressure and, therefore, the achievable fusion power. It has been experimentally observed that the NTM exhibits a threshold behaviour, with magnetic islands having to achieve a...
Mr
Xiaolan Zou
(France)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
One of the major challenges for the magnetic fusion community is how to extract energy from the core plasma of the fusion reactor without endangering the plasma facing components, in particular the divertor plates. For ITER, in order to not damage the divertor plates, the peak power load on the target plates is limited to 10MW/m2 in steady condition and 20MW/m2 in transient condition during...
Mr
Yunfeng Liang
(Germany)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
The challenge of fusion research and technology is to confine a burning plasma while having tolerable continuous and transient heat and particle fluxes on the plasma facing components. Experimental results demonstrate the edge magnetic topology plays a key role in the dependence of the plasma confinement, the edge MHD stability and the interaction between plasma and the first wall,...
Mr
Zhihong Lin
(USA)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
To accurately predict confinement properties of energetic particles in burning plasmas, fully self-consistent simulations must incorporate kinetic effects of thermal and energetic particles, nonlinear interactions of many shear Alfven eigenmodes, and cross-scale couplings of microturbulence and shear Alfven wave turbulence. Global gyrokinetic turbulence codes have recently been adapted for...
Ms
Sanae Itoh
(Japan)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
We report the theory that describes immediate impact of heating power on pressure-gradient-driven turbulence and turbulent transport (without waiting the changes of global parameters and those in mean distribution function). New mechanism, that the external source couples with plasma fluctuations in phase space so as to affect turbulence and
transport, is investigated. A new thermodynamical...
Ms
Sylvie Jacquemot
(France)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Waiting for completion of the Laser MégaJoule (LMJ) in the Aquitaine region, the French community is currently performing preliminary IFE-related experimental studies on smaller-scale laser facilities, such as the one operated at LULI, LULI2000 (figure below left) and ELFIE, thus taking advantage of their versatility and of the unique combination on target of multiple laser beams, with...
Mr
Riccardo Roccella
(ITER Organization)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Very high mechanical loads act on the ITER vacuum vessel and in-vessel components during EM transients (mainly plasma disruptions) because of the interaction between the currents induced in the conductive structures by those EM transients and the external high magnetic fields typical of the tokamak operations. For the design of many ITER components the EM loads are the most challenging and...
Mr
Peter Lang
(Germany)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Controlling the ELM frequency is an important task for the development of high performance plasma scenarios. Pellet ELM pacing is one of the most suitable tools to achieve this, due to the local action of the trigger process, which is expected to be effective even in high performance and high plasma current scenarios. Besides allowing ELM pacing investigations under the most ITER relevant...
Mr
Dennis Mansfield
(USA)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Large transient events, including edge localized modes (ELMs), would be problematic for high power fusion devices, including ITER, because of the associated large, periodic heat loads on plasma facing components. Two methods to address this issue are elimination of large ELMs altogether with, e.g. 3-D magnetic perturbations, or controlled triggering of rapid, small ELMs for a manageable...
Mr
Takeshi Ido
(Japan)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
The measurement of electrostatic potential fluctuations and density fluctuations using a heavy ion beam probe(HIBP) and magnetic field fluctuations using Mirnov coils clarified that the energetic-particle (EP)-driven geodesic acoustic mode (GAM) was excited in the central region of LHD plasmas. In addition, it was observed that the ion temperature measured using a neutral particle analyzer...
Mr
Shizuo Inoue
(Japan)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
We demonstrated periodic ejections of "plasmoid" -closed magnetic island- from the main tokamak plasma, its transportation and reconnection with a divertor plate by our TS-4 spherical tokamak experiment and 2-D MHD simulation. These are key results for a new “Dynamic divertor” whose unique magnetic separation of divertor plasma is expected to significantly reduce heat flux to the divertor...
Mr
Kunihiro Ogawa
(Japan)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Characteristics of fast-ion losses induced by toroidal- lfvén eigenmode (TAE) have been investigated over wide parameter ranges of the Large Helical Device (LHD) plasmas to reveal the fast-ion loss process. To study fast-ion losses, a scintillator-based lost-fast ion probe (SLIP) is used, and an increment of fast-ion loss flux due to the TAEs from the neoclassical orbit loss level (Delta Gamma...
Mr
Sumin Yi
(Korea, Republic of)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Understanding of turbulent plasma transport is crucial to achieve and control improved confinement states for steady state tokamaks such as ITER. Present day understanding and modeling of tokamak transport are primarily based on local properties of micro-instabilities with resonant mode structures, the competition of linear mode growth rates with shearing rates, etc. However, there is mounting...
Mr
Arata Nishimura
(Japan)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
On a design of a blanket for a fusion reactor, an elasto-plastic analysis of the structure
will be performed since huge amount of heat must be removed by a pressurized coolant. In addition, the pressure varies and the cyclic deformation occurs. The design fatigue life of the blanket will be around 1 x 10^4 cycles and it assumes the plastic strain component. Therefore, the design will be...
Mr
Ning Ding
(China)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
To develop reliable numerical simulation tools is very important for the theoretical research, experimental analysis and load designing of Z-pinch implosions. A dedicated Z-pinch implosion physical scheme of the two-dimensional numerical simulation of three-temperature radiation magneto- hydrodynamics code (MARED) is introduced. The results of its 1D test demonstrate that the MARED code is...
Mr
Won Ha Ko
(Korea, Republic of)
10/12/12, 2:00 PM
PD - Post Deadline
Poster
Pedestal rotation profiles are of great importance for ITER, in the multiple contexts of confinement enhancement, the source of intrinsic torque in H-mode, and their response to ELMs and to ELM mitigation techniques. In this paper, we report on findings from charge exchange spectroscopy (CES) studies of toroidal rotation and ion temperature profile structure and evolution in KSTAR H-mode...
Mr
Wilfred Cooper
(Switzerland)
10/12/12, 2:00 PM
Poster
Tokamaks with weak to moderate reversed central magnetic shear in which the minimum of the inverse rotational transform q_min is in the neighbourhood of unity can trigger bifurcated MagnetoHydroDynamic (MHD) equilibrium states. In addition to the standard axisymmetric branch that can be obtained with standard Grad-Shafranov solvers, a novel branch with a three-dimensional (3D) helical core has...
Mr
James Hanson
(Auburn University)
10/12/12, 2:00 PM
Poster
Equilibrium reconstruction is the process of minimizing the mismatch between modeled and observed signals by changing the parameters that specify the equilibrium. While stellarator equilibria are inherently non-axisymmetric, non-axisymmetric effects are also crucial for understanding stability and confinement of high-performance reversed field pinch and tokamak plasmas. Therefore,...
Mr
Tomo-Hiko Watanabe
(Japan)
10/12/12, 2:00 PM
Poster
Turbulence spectra and transport in helical plasmas are investigated by the gyrokinetic simulations of ion temperature gradient (ITG) turbulence interacting with microscopic ExB zonal flows (ZFs) and by the neoclassical transport analysis of macroscopic ExB flows. Our recent kinetic simulations enable us quantitative evaluation of the turbulent transport level and the macroscopic radial...
Mr
Gary M. Staebler
(USA)
10/12/12, 2:00 PM
Poster
The toroidal Reynolds stress due to the shear in the ExB velocity Doppler shift acts like a momentum pinch [1] against the parallel velocity shear contribution to the stress. This momentum pinch cannot be computed with the quench rule paradigm [2]. This is because the quench rule only reduces the amplitude of the turbulence and does break the parity of the linear eigenfunctions [1]. Detailed...
