Global ETD Search
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Showing 1 to 10 of 10 for “"edge transport"”.
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Edge transport barrier studies on the Alcator C-Mod tokamak
Edge transport barriers (ETBs) in tokamak plasmas accompany transitions from low confinement (L-mode) to high confinement (H-mode) and exhibit large density and temperature gradients in a narrow pedestal region near the last closed flux surface (LCFS). Because tokamak energy confinement depends …
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Experimental Studies of Neutral Particle Effects on Edge Transport Barriers in Tokamaks Using the Lyman-alpha Measurement Apparatus
… capabilities remain limited for the tokamak edge density profile due to small spatial scales, complex plasma transport, and non-negligible effects of neutral particles. To better quantify the hydrogenic neutral particle source, a one-dimensional, absolutely calibrated pinhole camera system …
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Edge radial electric field studies via charge exchange recombination spectroscopy on the Alcator C-Mod Tokamak
… shear is responsible for the suppression of edge turbulence, which reduces the losses of both energy and particles across magnetic field lines and results in the formation of edge transport barriers and high-confinement mode (H-mode) in tokamak plasmas. However, the self consistent evolution …
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Understanding the nature of fluctuations in the edge of I-mode and L-mode plasmas at ASDEX Upgrade
Changes in turbulence at the plasma edge are thought to lead to the formation of the edge transport barrier in tokamak plasmas, which defines the transition from low confinement (L-mode) to high confinement operation such as H-mode or the "improved'' confinement regime I-mode. I-mode is of …
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Mitigation of RF sheaths through design and implementation of magnetic field-aligned ICRF antenna
… enhanced impurity confinement due to internal transport barriers (ITBs) and H-mode operation establishes a very low tolerance for high-Z impurities [1]. Experiments have shown that impurity accumulation increases as power in the ion cyclotron range of frequencies (ICRF) is increased [2]. As a …
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Three-dimensional plasma transport in open chaotic magnetic fields : a computational assessment for tokamak edge layers
… applied magnetic perturbations at the plasma edge, and are of great interest for the control of particle and energy exhausts. In the present thesis the 3D edge plasma and neutral particle transport code EMC3-EIRENE is applied to two distinct configurations of open chaotic magnetic system: at …
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Quantum Hall transport in graphene and its bilayer
… energy Landau level. In this thesis, we present transport studies at high magnetic field on both monolayer and bilayer graphene, with a particular emphasis on the quantum Hall (QH) effect at the charge neutrality point, where both systems exhibit broken symmetry of the degenerate Landau level at …
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Investigation on High-Mobility Graphene Hexagon Boron Nitride Heterostructure Nano-Devices Using Low Temperature Scanning Probe Microscopy
… at visualising the ballistic and topological transport on the high-mobility graphene/boron nitride heterostructure using the scanning gate microscope. For the first experiment, we use the scanning gate microscopy to map out the trajectories of ballistic carriers in high-mobility graphene …
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Topological Insulating States in Photonics and Acoustics
… systems might support dissipation-free boundary transport of electrons or zero dimensional localization of solid states.</p> <p>Topological insulators have not only attracted tremendous attentions from the communities of condensed matter, but also inspired various explorations in classical …
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H-Mode Transport of Tokamak Plasmas
Made available in DSpace on 2017-07-06T18:49:03Z (GMT). No. of bitstreams: 3 Kinsey_Jonathan_E_MS.pdf: 47934458 bytes, checksum: 423723ca42f8f3627b50a2cc02ddcedb (MD5) Kinsey_Jonathan_E_MS_ABS.pdf: 478782 bytes, checksum: 97c6d02980af95274ac760c1fcc6f788 (MD5) license.txt: 4813 bytes, checksum: …