Local Gas Injection as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak PDF Download
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Author: David Francis Jablonski
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
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Book Description
Author: David Francis Jablonski
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
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Book Description
A capillary puffing array has been installed on Alcator C-Mod which allows localized introduction of gaseous species in the scrape-off layer. This system has been utilized in experiments to elucidate both global and local properties of edge transport. Deuterium fueling and recycling impurity screening are observed to be characterized by non-dimensional screening efficiencies which are independent of the location of introduction. In contrast, the behavior of non-recycling impurities is seen to be characterized by a screening time which is dependent on puff location. The work of this thesis has focused on the use of the capillary array with a camera system which can view impurity line emission plumes formed in the region of an injection location. The ionic plumes observed extend along the magnetic field line with a comet-like asymmetry, indicative of background plasma ion flow. The flow is observed to be towards the nearest strike-point, independent of x-point location, magnetic field direction, and other plasma parameters. While the axes of the plumes are generally along the field line, deviations are seen which indicate cross-field ion drifts. A quasi-two dimensional fluid model has been constructed to use the plume shapes of the first charge state impurity ions to extract information about the local background plasma, specifically the temperature, parallel flow velocity, and radial electric field. Through comparisons of model results with those of a three dimensional Monte Carlo code, and comparisons of plume extracted parameters with scanning probe measurements, the efficacy of the model is demonstrated. Plume analysis not only leads to understandings of local edge impurity transport, but also presents a novel diagnostic technique.
Author: David F. Jablonski
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Author: S. J. Zweben
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Category : Tokamaks
Languages : en
Pages : 9
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Author: Daniel Hung Chee Lo
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Category :
Languages : en
Pages : 194
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Author: Earl S. Marmar
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Category :
Languages : en
Pages : 13
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Category : Aeronautics
Languages : en
Pages : 704
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Author: Baʹlint Vetoʺ
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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(Cont.) For the first time, the poloidal measurements of the plasma edge brightness with and without the D2 neutral gas puff yielded an estimate for the vertical extent of the neutral gas puff. The steady state inboard and outboard D, brightness profiles are also compared during two consecutive periods of L and H mode operation. The time lagged cross correlation calculated for neighboring views revealed quickly propagating local brightness maxima (blobs). The phase velocity of these systematically moving brightness perturbations ranges from -1 to 1 km/s inside the separatrix and becomes uniform outside the separatrix at 0.5 km/s where the positive velocity indicates radially outward motion. Downward propagating perturbations are also observed in the outboard SOL.
Author:
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Category :
Languages : en
Pages :
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Recent interest in the experimental study of tokamak plasma flow for different magnetic field geometries calls for theoretical understanding of the effects of tokamak magnetic topology changes on the flow. The consequences of total magnetic field reversal and/or X-point reversal on divergence-free plasma flow within magnetic flux surfaces are considered and the results are applied to interpret recent Alcator C-Mod scrape-off layer flow measurements. In his comment to that work, Aydemir asserted that poloidal plasma flow reversal is not a valid response to toroidal magnetic field reversal in an up-down symmetric tokamak, and that the toroidal plasma flow must reverse instead. We show that this assertion is wrong due to his misunderstanding of the corresponding symmetry transformation.
Author: Michael Anthony Graf
Publisher:
ISBN:
Category :
Languages : en
Pages : 190
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