large helical device
Ka-band Microwave Frequency Comb Doppler Reflectometer System for the Large Helical Device
... Recently, a multi-channel system operating over a broad frequency range has been demonstrated [9]. The sys- tem is utilized for measuring not only the spatial structure of the plasma parameters, but also the temporal ...
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Stability and Confinement Studies of High-Performance NBI Plasmas in the Large Helical Device Toward a Steady-State Helical Fusion Reactor
... Recent progress in plasma performance and the understanding of the related physics in the Large Helical Device is overviewed. The volume-averaged beta value is increased with an increase in the ...
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A quantitative model for heat pulse propagation across Large Helical Device plasmas
... It is known that rapid edge cooling of magnetically confined plasmas can trigger heat pulses that propagate rapidly inward. These can result in large excursion, either positive or negative, in the electron ...
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Evaluation of Neutron Emission Rate with FIT3D-DD Code in Large Helical Device
... the Large Helical Device (LHD), deuterium exper- iments have been performed by using tangentially-injected neutral beams (NBs) with the ∼ 180 keV deuterium and perpendicularly-injected NBs with the ...
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Observation of Tungsten Line Emissions in Wavelength Range of 10 – 500 Å in Large Helical Device
... range, e.g. 200 - 500 Å, are not well examined because it is believed that tungsten lines probably do not exist in such a long wavelength range, while a soft x-ray spectrometer observing the wavelength range of 150 - 400 ...
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Modelling the measured local time evolution of strongly nonlinear heat pulses in the Large Helical Device
... are large scale physical systems, nonlinearly coupled across a broad range of spatio-temporal scales and far from ...a large aspect ratio tokamak, local magnetic shear is a good proxy for ...
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Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device
... Plasma heating and current drive with Electron Cyclotron Waves (ECWs) require precise control over the polarization state of ECWs to ensure that the entire input power is deposited where intended. However, due to the ...
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Evaluation of an Energetic Particle Profile Using a Tangential-FIDA Diagnostic in the Large Helical Device
... the Large Helical Device (LHD) in order to observe energetic distribution of toroidal circulating energetic particles which are produced by tangential Negative Neutral Beams ...
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Observation of the Internal Structure of Energetic Particle-Driven MHD Modes in a Large Helical Device
... the Large Helical Device, three microwave reflectometer systems have been recently installed for measuring the density fluctuation in the wide radial region with a high spatial ...
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Recent Studies of Hydrogen Negative Ion Source and Beam Production for NBI in Large Helical Device
... ing device for production of high-density and hot plasmas in fusion ...the Large Helical Device (LHD) [1], and have achieved 27 MW beam ...
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Observations of the Gas Stream from the Large Helical Device for the Design of an Exhaust Detritiation System
... A small amount of tritium is produced by deuterium–deuterium reactions in the core plasma during deu- terium plasma experiments conducted in the Large Helical Device (LHD). From the viewpoints of ...
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Development of the Heating Scenarios to Achieve High-Ion Temperature Plasma in the Large Helical Device
... the Large Helical Device (LHD) are categorized in terms of the heating scenarios that are closely related to the development of neutral beam injection (NBI) ...
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Rotation of Interchange Instability in the Large Helical Device
... The rotation of resistive interchange instabilities excited in the periphery of plasmas compared to plasma flows under various plasma conditions in the Large Helical Device. The observed ...
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Development of Collective Thomson Scattering Diagnostic for Bulk and Fast Ions in the Large Helical Device
... The collective Thomson scattering (CTS) technique has been utilized with the backscattering configuration to diagnose the bulk and fast ions in the Large Helical Device (LHD). The spectrogram of the ...
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Spectroscopic Diagnostics for Spatial Density Distribution of Plasmoid by Pellet Injection in the Large Helical Device
... To investigate the behavior of a plasmoid consisting of pellet ablatant ionized by background plasma, two dimensional imaging measurements of high-speed spectroscopy have been developed using a fast camera in the ...
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Observation of the Effect of Energetic Ions on Pellet Ablation in the Large Helical Device
... Ablation of a solid hydrogen pellet in hot plasmas was investigated in the Large Helical Device (LHD). The penetration depth of the injected pellets in the experiment was compared to a theoretical ...
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Onset of Resistive Interchange Mode in the Large Helical Device
... The relationship between magnetohydrodynamic (MHD) modes and the linear stability boundary has been investigated by controlling the pressure gradient in the Large Helical Device. Edge plasma pressure ...
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Particle Orbit Analysis in the Finite Beta Plasma of the Large Helical Device using Real Coordinates
... High-energy particles in a finite beta plasma of the Large Helical Device (LHD) are numerically traced in a real coordinate system. We investigate particle orbits by changing the beta value and/or ...
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Experimental Results for Electron Bernstein Wave Heating in the Large Helical Device
... Electron cyclotron heating (ECH) using electron Bernstein waves (EBWs) was studied in the large helical device (LHD). Oblique launching of the slow extraordinary (SX-) mode from the high field side ...
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Characteristics of Radiating Collapse at the Density Limit in the Large Helical Device
... up to 11 MW in the Large Helical Device (LHD). The density limit in LHD is observed to be greater than 1.6 times the Sudo limit. The density is ultimately limited by a radiating collapse which is ...
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