Global ETD Search
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Showing 1 to 13 of 13 for “"stellarator"”.
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Confinement of Non-neutral Plasmas in Stellarator Magnetic Surfaces
The Columbia Non-neutral Torus (CNT) is the first experiment designed to create and study small Debye length non-neutral plasmas confined by magnetic surfaces. This thesis describes experimental confinement studies of non-neutral plasmas on magnetic surfaces in CNT. Open orbits exist in CNT …
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Experimental and computational magnetic surface mapping of the HIDRA stellarator
HIDRA, the Hybrid Illinois Device for Research and Applications, is a newly acquired fusion device by the University of Illinois at Urbana-Champaign. It is an l = 2 machine with a five-fold toroidal symmetry, that was previously run by the Max-Planck-Institut für Plasmaphysic in Greifswald under …
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Three-dimensional modeling of plasma transport in the HIDRA stellarator
… been dedicated. HIDRA is an l=2, m=5 classical stellarator originally built in in the 1970's for RF heating studies. Its most recent users at the Max Planck Institute for Plasma Physics ran the device as WEGA to test heating schemes and train personnel for the recently-completed W-7X advanced …
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Constraints on the scale of toroidal fusion experiments with application to the design of a helical axis stellarator
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1983.
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Electric fields and transport in optimized stellarators
Recent stellarator experiments have been designed with one of two types of neoclassical optimization: quasisymmetry or quasi-isodynamism. Both types of stellarator have perfectly confined collisionless particle orbits as well as one additional feature. Quasisymmetric plasmas have minimal flow …
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Hybrid Illinois Device for Research and Applications material analysis test-stand development for characterization of fusion plasma-material interactions
… at Urbana-Champaign (UIUC) is the only tokamak-stellarator hybrid that is wholly dedicated to the study of material science, mainly research pertaining to fusion plasma facing components (PFCs). HIDRA’s long-pulse steady-state stellarator plasmas provide a unique plasma environment to test …
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Machine Learning and Deep Learning applications for the protection of nuclear fusion devices
… (JET) Tokamak and the Wendenstein 7-X (W7-X) Stellarator. JET is currently the world's largest operational Tokamak and the only one operated with the Deuterium-Tritium fuel, while W7-X is the world's largest and most advanced Stellarator. For the work on JET, research focused on the prediction …
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Plasmas of Arbitrary Neutrality
… such plasmas. Plasmas are confined in a stellarator without the need for a plasma current, and regardless of the degree of neutralization. The Columbia Non-neutral Torus (CNT) is a stellarator dedicated to the study of non-neutral, and partially neutralized plasmas. This thesis describes …
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Design of the gas-puff imaging diagnostic for Wendelstein 7-X
Stellarators, being not as well-studied as tokamaks, have plenty of interesting physics to examine, as investigations of stellarators as a viable configuration for future power plants continue. One of these aspects is boundary turbulence in the plasma, as the magnetic configuration in stellarators …
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Whole-device modeling of HIDRA plasmas for experimental planning
The HIDRA stellarator at the University of Illinois at Urbana-Champaign is preparing for operations with flowing liquid lithium limiters inside the machine. The objective of these experiments is to test the operation of the limiters under steady-state conditions with a fusion-relevant plasma edge. …
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Gaussian process tomography for the analysis of line-integrated measurements in fusion plasmas
… hierbei um die Röntgendiagnostiken der beiden Stellaratoren W7-AS und TJ-II, sowie um die Rekonstruktion von Bolometer-Messdaten am Stellarator WEGA und am Tokamak JET.
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Bayesian analysis of electron cyclotron emission measurements at Wendelstein 7-X
… a standard diagnostic technique on the optimized stellarator Wendelstein 7-X (W7-X) that can record data with a high resolution in time. The spatial assignment via the blackbody emission of a plasma layer depends on the optical depth and thus plasma parameters as well as the magnetic field along …
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Manifold learning techniques and statistical approaches applied to the disruption prediction in tokamaks
… configurations or toroidal configurations, e.g., stellarator, reverse field pinch, or tokamak. Among the explored magnetic confinement techniques, the tokamak configuration is to date considered the most reliable. Unfortunately, the tokamak is vulnerable to instabilities that, in the most severe …