JT-60U
Advanced Tokamak Research in JT-60U and JT-60SA
... In JT-60U, systems for plasma control, heating/current drive and diagnostics were upgraded to obtain a long-duration plasma with auxiliary heating using neutral beams (NBs) and electron cyclotron (EC) waves ...
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Roles of Toroidal Rotation at the Plasma Edge, Toroidal Field Ripple and Configuration on ELMs in the JT-60U Tokamak
... The JT-60U has 11 positive-ion-based Neutral Beams (PNBs ∼85 keV) and 2 negative-ion-based NBs (NNBs ∼350-420 keV, #15 and #16) as shown in Fig. 1. There are two tangential co-NBIs (#9 and #10) and two ctr- ...
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Orbit Following Calculation of Energetic Ions in the Design of Ferritic Insertion in the JT-60U
... The injected neutral beams were 7 perpendicular PNBs, 2 co-tangential PNBs, and 2 counter-tangential PNBs as shown in Fig. 2. The injection energy was 85 keV for this analysis. The total injected power was about 24.75 MW ...
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Scrape-off Layer Plasma Flow in L- and H-Mode Plasmas on JT-60U
... Significant progress has been made in understanding the scrape-off layer (SOL) mass transport along mag- netic field lines—the SOL flow. Understanding the driving mechanisms of the SOL flow was summarized based on ...
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Gyrokinetic Analyses of Core Heat Transport in JT-60U Plasmas with Different Toroidal Rotation Direction
... of JT-60SA and ITER [3, ...In JT-60U, the roles of toroidal rotation in weak magnetic shear plas- mas with parabolic type ITB were studied using neutral beam (NB) injection, and it was found that ...
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Development of High Power Gyrotron and Power Modulation Technique using the JT-60U ECRF System
... Electron cyclotron range of frequency system of the JT-60U finished operation at the end of August 2008, and improvements toward JT-60SA have been started. In the last two years stable gyrotron ...
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Onset and Evolution of m/n = 2/1 Neoclassical Tearing Modes in High-βp Mode Discharges in JT-60U
... effects [15]. In addition, from the viewpoint of experimen- tal research, the measurement of magnetic islands in the very early phase of NTM growth is difficult because of the limited spatial resolution and signal-to-noise ...
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Neutron Emission Profile Measurement and Fast Charge Exchange Neutral Particle Flux Measurement for Transport Analysis of Energetic Ions in JT-60U
... The data acquisition system for measurements of energy distribution and flux of CX neutral particles is as follows. The NDD is connected to a preamplifier (CANBERRA-2001A), then to a fast spectroscopy ampli- fier ...
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Transient Response of Divertor Plasma During Transition to ELM Free H-Mode Phase in JT-60U
... In JT-60U, the mm-wave interferometer has been de- veloped [7] for measuring the line-integrated electron den- sity at the upper stream of the divertor plasma, thus pro- viding a means to investigate the ...
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Multi-Channel Neutron Emission and Triton Burn-up Measurement on JT-60U Using Digital Signal Processors
... In JT-60U, DD neutrons were measured mainly be- cause energetic deuterium was injected as a neutral beam (NB) into the deuterium plasma. Not only 2.5 MeV neu- trons but also 1 MeV tritons are produced ...
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Chemical Binding States of Carbon Atoms Migrated in Tungsten Coating Layer Exposed to JT-60U Divertor Plasmas
... Since the oxygen atoms originate mainly from atmo- sphere during the tile storage in air, the effects on the car- bon migration would be negligible. Figure 9 shows depth profiles of concentrations of oxygen atoms over ...
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Rotational Stabilization of Resistive Wall Mode on JT-60U
... plasma close to the wall for wall stabilization with suffi- cient heating power. Figure 2 gives the poloidal cross sec- tion of JT-60U with a plasma and the ferritic steel tiles. The ferritic steel tiles ...
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Integrated Performance and Critical Issues for Steady-State Operation in JT-60U
... This paper reports on the integrated performance achieved in JT-60U toward the steady-state operation fore- seen in the ITER and DEMO reactors. Advanced tokamak plasmas with weak shear or reversed shear ...
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Development of Advanced Tokamak Operation Scenarios in JT-60U and JT-60SA
... profile, JT-60SA is designed to possess the strong current drive capability of 10 MW N-NB at 500 keV and 7 MW of ...the JT-60SA, therefore, the beam line of the N-NB is modified downward by ...
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Linear and non linear plasma equilibrium responses on the JT 60U and TCV tokamaks
... Thanks go to the TCV and JT-60U teams without whom the experimental results would not be comparable with the models. Two of the au- thors (RK, VL) thank the CRPP for their hospi- tality during visits to ...
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Role of the Electron Temperature in the Current Decay during Disruption in JT-60U
... in JT-60U owing to a massive neon gas puff by using the disruption simulation code ...in JT-60U, the fast electron temperature decrease is followed by a transient plasma current ...
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Density Fluctuation Measurements Using a Frequency Hopping Reflectometer in JT-60U
... In JT-60U, the confinement properties and onset con- ditions of the internal transport barrier (ITB) in weak pos- itive magnetic shear, and weak and strong reversed mag- netic shear plasmas have been ...
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Development of a Lithium Beam Probe and Measurement of Density Pedestal in JT-60U
... In JT-60U, ELM studies for type I ELMs [7–9] and grassy ELMs [10, 11] have been extensively ...as JT-60U, it is difficult for the edge diagnos- tics to satisfy both the highly spatial and ...
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Spatial Structure of Volume Recombination in JT-60U Detached Divertor Plasmas
... Figure 1 (a) shows a schematic view of a cross-section of the JT-60U tokamak, and Fig. 1 (b) an enlarged view of a cross-section of the divertor region. The divertor region was covered by 60 vertical (1-60 ...
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Effect of Magnetic Island Associated with Neoclassical Tearing Modes on Plasma Rotation in JT-60U
... This paper describes the dependence of the rotation frequency of an m/n = 2/1 neoclassical tearing mode (NTM) on its magnetic island width in JT-60U (m and n are the poloidal and toroidal mode numbers, ...
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