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Showing 1 to 20 of 26 for “"PLASMA CONFINEMENT"”.
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Electrostatic-Inertial Plasma Confinement
Made available in DSpace on 2014-12-11T17:25:59Z (GMT). No. of bitstreams: 1 7105085.pdf: 3320550 bytes, checksum: 8e6a570cbd7a876c9d2c1260fe8a8206 (MD5) Previous issue date: 1970
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Electron Bernstein wave current drive modeling in toroidal plasma confinement
The steady-state confinement of tokamak plasmas in a fusion reactor requires non-inductively driven toroidal currents. Radio frequency waves in the electron cyclotron (EC) range of frequencies can drive localized currents and are thus particularly attractive for control of the current profile. In …
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Plasma confinement optimization of the versatile toroidal facility for ionospheric plasma simulation experiments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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Evolution of radial force balance and radial transport over L-H transition
Understanding of plasma confinement modes is an essential component in development of a fusion reactor. Plasma confinement directly relates to performance of a fusion reactor in terms of energy replacement time requirements on other design parameters. Although a variety of levels of confinement …
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H (sub) alpha & Neutral Density Scaling in the Maryland Centrifugal eXperiment
… Centrifugal eXperiment (MCX) is a hydrogen plasma confinement experiment with a rotating mirror magnetic configuration. This experiment was designed to test the concepts of centrifugal confinement and velocity shear stabilization which may allow scaleability to a fusion reactor. These two …
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Velocity-ion temperature gradient driven modes and angular momentum transport in magnetically confined plasmas
Plasma confinement experiments continue to uncover fascinating phenomena that motivate theoretical discussion and exploration. In this thesis, we consider the phenomenon of angular momentum transport in magnetically confined plasmas. Relevant experiments and theoretical developments are presented …
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Investigation of asymmetric plasma blob dynamics
… at MIT. Blobs are local regions of enhanced plasma density. Blobs are relevant to several areas of physics research, including fusion experiments. Understanding blob dynamics is important because blobs affect plasma confinement, a key issue for fusion experiments. The blobs in this experiment …
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Comparison of charge-exchange recombination spectroscopy measurements of the pedestal region of Alcator C-Mod with neoclassical flow predictions
… C-Mod are important aspects of understanding plasma confinement and transport. In this study, we examine the simplified neoclassical predictions for impurity flows using equations developed for plasmas with background ions in the Pfirsch-Schliter (PS, high collisionality) and banana (low …
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Tearing-mode transport model in the reversed field pinch concept
… equilibrium configurations which describe a plasma evolution dominated by particular instabilities originated by plasma electrical resistivity (tearing-, or resistive interchange, modes). The ultimate goal is to provide a model of transport scaling in an RFP which can evaluate the global …
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Supersonic Constricted Plasma Flows
… in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of radiofrequency power. The discharge can operate either continuously or in rapid pulsed mode since plasma breakdown initiates …
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Supersonic Constricted Plasma Flows
… in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of radiofrequency power. The discharge can operate either continuously or in rapid pulsed mode since plasma breakdown initiates …
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Hollow Plume Mitigation of a High-Efficiency Multistage Plasma Thruster
… in Germany. This High Efficiency Multistage Plasma Thruster, or HEMPT, has promising lifetime capabilities due to its plasma confinement system. However, the permanent magnet system that offers this and other benefits also creates a hollow plume, where ions are accelerated at angles rather …
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Machine Learning and Deep Learning applications for the protection of nuclear fusion devices
… of “disruptions”, and sudden terminations of plasma confinement. For the development and testing of machine learning classifiers, a total of 198 disrupted discharges and 219 regularly terminated discharges from JET. Convolutional Neural Networks (CNNs) were proposed to extract the …
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Edge radial electric field studies via charge exchange recombination spectroscopy on the Alcator C-Mod Tokamak
… formation of edge transport barriers and high-confinement mode (H-mode) in tokamak plasmas. However, the self consistent evolution of the radial electric field profile (Er), pedestal shape and improvement in plasma confinement is not well understood. A better understanding of pedestal physics …
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Plasma flow and acceleration in the magnetic mirror and nozzle geometries
… investigates key physics governing transonic plasma flow within converging-diverging magnetic field (magnetic nozzle) configurations as used in fusion open mirror systems and plasma propulsion applications. In such configurations, plasma is accelerated from subsonic to supersonic velocities …
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Radio-Frequency Plasma Expansion in Different Magnetic Nozzle Configurations
… conducted in the novel radio-frequency plasma device Moa. The research focuses on the effects of magnetic field strength and orientation on plasma expansion and ion acceleration when the location of plasma excitation is decoupled from the magnetic nozzle (MN) throat with the aim to …
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The impact of transient mitigation schemes on the MAST edge plasma
… is the sudden and uncontrolled loss of plasma confinement in a tokamak. Disruptions on the Mega Amp Spherical Tokamak (MAST) are characterised in terms of thermal quench timescales, energy balance and pre disruption energy loss. Analysis of the energy balance during disruptions on MAST …
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Fundamental study of magnetic field-assisted micro-EDM for non-magnetic materials
… problem, one aimed at altering the discharge plasma channel through the use of magnetic fields to affect plasma confinement and/or plasma stability and the other aimed to improve the material removal mechanism of the µ-EDM process through the use of Lorentz forces induced in the melt pool. …
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Development of intersubband terahertz lasers using multiple quantum well structures
… inversion, new methods for long-wavelength mode confinement, and farinfrared spectral measurement techniques are critical steps in achieving this goal. Conduction-band three-level subband systems in triple-quantum-well structures using GaAs/Alo.3Gao.7As heterostructures were proposed, designed, …
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