Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Magnetic topology"”.
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Evolution of 3-d magnetic topology in flare-productive active regions
… (CMEs), derive their energy from complex magnetic fields and are the principal source of disturbances that affect space weather. Although physical mechanism and dynamic morphology of flares have been a subject of intense research, many aspects of the flaring process still remain unclear. …
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Plasma flows in the Alcator C-Mod scrape-off layer
… elusive. To investigate these phenomena, a novel magnetically-actuated scanning probe has been deployed on the high-field side in Alcator C-Mod. This probe, along with two other scanning probes on the low-field side, measure the total plasma flow vector at these locations: parallel flows, …
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The influence of Hall currents, plasma viscosity and electron inertia on magnetic reconnection solutions
This thesis examines magnetic reconnection in the solar corona. Magnetic reconnection is the only mechanism which allows the magnetic topology of magnetized plasmas to be changed. Many of the dynamic processes in the Sun's atmosphere are believed to be driven by magnetic reconnection and studying …
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Magnetic reconnection physics in the solar wind with Voyager 2
Magnetic reconnection is the process by which the magnetic topology evolves in collisionless plasmas. This phenomenon is fundamental to a broad range of astrophysical processes such as stellar flares, magnetospheric substorms, and plasma accretion, yet it is poorly understood and difficult to …
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Study of ergodic divertor edge density regimes on the tokamaks Tore Supra and TEXTOR, and sensitivity of tunnel probe electron temperature measurements to a suprathermal electron component
… our future energy needs in a sustainable way. Magnetic confinement in a so-called 'tokamak'-machine is a possible approach towards the achievement of a burning plasma. An important issue in this tokamak research is the transition of the plasma edge to the inner wall. A first topic that is …
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Development and simulation of a cylindrical cusped-field thruster and a diagnostics tool for plasma-materials interactions
… Propulsion Laboratory, this thruster uses cusped magnetic fields aligned in alternating polarity in order to confine electrons, thus slowing their flow to the anode and readily ionizing neutral gas, which is then electrostatically accelerated by the anode. The design methodology for the CCFT will …
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Experimental and computational magnetic surface mapping of the HIDRA stellarator
… and LiMIT plates on HIDRA, characterizing the magnetic configuration of the device is necessary. While previous campaigns were conducted on WEGA for the same purpose, with the disassembly and re assembly of HIDRA, the physical disposition of the coils and/or vacuum vessel may have been offset …
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Generalised mathematical models for 3D magnetic reconnection at null points: magnetic reconnection at null points
… plasma can store large amounts of energy in the magnetic field. This energy is released when a sudden change in the magnetic topology of the field occurs-facilitated by the process of `magnetic reconnection'. A great deal of research has been focussed on understanding the reconnection process and …