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Local Gas Injection As A Scrape Off Layer Diagnostic On The Alcator C Mod Tokamak
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Book Synopsis Local Gas Injection as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak by : David Francis Jablonski
Download or read book Local Gas Injection as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak written by David Francis Jablonski and published by . This book was released on 1996 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Local Gas Injection as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak by :
Download or read book Local Gas Injection as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak written by and published by . This book was released on 1996 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Local Impurity Puffing as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak by : David F. Jablonski
Download or read book Local Impurity Puffing as a Scrape-off Layer Diagnostic on the Alcator C-Mod Tokamak written by David F. Jablonski and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Edge Turbulence Imaging in the Alcator C-Mod Tokamak by : S. J. Zweben
Download or read book Edge Turbulence Imaging in the Alcator C-Mod Tokamak written by S. J. Zweben and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charged Fusion Product Diagnostic on the Alcator C-Mod Tokamak by : Daniel Hung Chee Lo
Download or read book Charged Fusion Product Diagnostic on the Alcator C-Mod Tokamak written by Daniel Hung Chee Lo and published by . This book was released on 1996 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Resolution Visible Continuum Imaging Diagnostic on the Alcator C-Mod Tokamak by : Earl S. Marmar
Download or read book High Resolution Visible Continuum Imaging Diagnostic on the Alcator C-Mod Tokamak written by Earl S. Marmar and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fast Photodiode Diagnostic on Alcator C-Mod Tokamak to Study the Plasma Edge/SOL Structure by : Baʹlint Vetoʺ
Download or read book Fast Photodiode Diagnostic on Alcator C-Mod Tokamak to Study the Plasma Edge/SOL Structure written by Baʹlint Vetoʺ and published by . This book was released on 2005 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: (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.
Book Synopsis Response to ""Comment on ""Magnetic Topology Effects on Alcator C-mod Scrape-off Layer Flow by :
Download or read book Response to ""Comment on ""Magnetic Topology Effects on Alcator C-mod Scrape-off Layer Flow written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Impurity Injection Experiments on the Alcator C-Mod Tokamak by : Michael Anthony Graf
Download or read book Impurity Injection Experiments on the Alcator C-Mod Tokamak written by Michael Anthony Graf and published by . This book was released on 1995 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Detached Scrape-off Layer Tokamak Plasmas by : Jay Kesner
Download or read book Detached Scrape-off Layer Tokamak Plasmas written by Jay Kesner and published by . This book was released on 1995 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Contrast Imaging on the Alcator C-Mod Tokamak by : Alexander Mazurenko
Download or read book Phase Contrast Imaging on the Alcator C-Mod Tokamak written by Alexander Mazurenko and published by . This book was released on 2001 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase Contrast Imaging (PCI) is a new diagnostic that was built for the Alcator C-Mod tokamak. It measures line-integrated (along 12 vertical chords) plasma density perturbations with good temporal (2-500 kHz) and wavenumber (0.5-12 /cm) resolution. The Quasi-Coherent (QC) fluctuation mode was studied using the PCI and other diagnostics. The mode was found to cause fluctuation of density, electric and magnetic field in the plasma edge with typical frequency of 100 kHz and typical poloidal wavenumber of about 5/cm. The mode was found to be responsible for confinement properties of the "Enhanced D-alpha H-mode" (a particularly favorable regime of tokamak operation). Through numerical modeling, the physical origin of the fluctuations was tentatively identified as "resistive X-point" mode (a kind of resistive ballooning mode strongly affected by the X-point configuration of magnetic field lines). The PCI system has been upgraded to detect waves in the ion cyclotron range of frequencies (ICRF, 40-80 MHz) by means of optical heterodyning - a technique based on modulation of the diagnostic laser beam near the wave frequency. The upgraded system was then used to study propagation of the Fast Magnetosonic Waves. These waves, which have never been measured in detail in past experiments, are being used to heat the tokamak plasma at the megawatt power level. The measured results were compared to the simple cold-plasma dispersion relation and to predictions of the full-wave 3D numerical modeling.
Book Synopsis The Scrape-off-layer in Alcator C-Mod by : James L. Terry
Download or read book The Scrape-off-layer in Alcator C-Mod written by James L. Terry and published by . This book was released on 2005 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Evidence that this turbulent transport may play an important role in the core-plasma density limit is presented. Much lower levels of turbulence and no blobs are observed in the high-field-side scrape-off-layer. For single-null magnetic configurations, plasma in the inboard scrape-off-layer appears to be almost entirely a result of plasma flow along field lines from the low-field side. Strong parallel flows with sensitivity to magnetic topology are found, along with strong evidence for momentum coupling between these scrape-off-layer flows and core toroidal rotation
Book Synopsis Advances in Measurement and Modeling of the High-confinement-mode Pedestal on the Alcator C-Mod Tokamak by : Jerry Wayne Hughes
Download or read book Advances in Measurement and Modeling of the High-confinement-mode Pedestal on the Alcator C-Mod Tokamak written by Jerry Wayne Hughes and published by . This book was released on 2005 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edge transport barrier (ETB) studies on the Alcator C-Mod tokamak [Phys. Plasmas 1, 1511, (1994)] investigate pedestal scalings and radial transport of plasma and neutrals. Pedestal profiles show trends with plasma operational parameters such as total current IP . A ballooning-like I2P dependence is seen in the pressure gradient, despite calculated stability to ideal ballooning modes. A similar scaling is seen in the near scrape-off-layer for both low-confinement (L-mode) and H-mode discharges, possibly due to electromagnetic fluid drift turbulence setting transport near the separatrix. Neutral density diagnosis allows examination of D0 fueling in H-modes, yielding profiles of effective particle diffusivity in the ETB, which vary as IP is changed. Edge neutral transport is studied using a 1D kinetic treatment. In both experiment and modeling, the C-Mod density pedestal exhibits a weakly increasing pedestal density and a nearly invariant density pedestal width as the D0 source rate increases. Identical modeling performed on pedestal profiles typical of DIII-D [Nucl. Fusion 42, 614, (2002)] reveal differences in pedestal scalings qualitatively similar to experimental results.
Book Synopsis A Novel Tracer-gas Injection System for Scrape-off Layer Impurity Transport and Screening Experiments by : Brian LaBombard
Download or read book A Novel Tracer-gas Injection System for Scrape-off Layer Impurity Transport and Screening Experiments written by Brian LaBombard and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Understanding of Neutral Gas Transport in the Alcator C-Mod Tokamak Divertor by : D. P. Stotler
Download or read book Understanding of Neutral Gas Transport in the Alcator C-Mod Tokamak Divertor written by D. P. Stotler and published by . This book was released on 2002 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Triggering Mechanism of Internal Transport Barriers on the Alcator C-Mod Tokamak Using Thomson Scattering Diagnostic by : Kirill Zhurovich
Download or read book Investigation of Triggering Mechanism of Internal Transport Barriers on the Alcator C-Mod Tokamak Using Thomson Scattering Diagnostic written by Kirill Zhurovich and published by . This book was released on 2007 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal transport barriers (ITBs) in tokamak plasmas are characterized by the reduction of transport in one or more of the particle, momentum, or energy channels in the core plasma region. On Alcator C-Mod, significant contributions to ITB studies were made possible with the core Thomson scattering (TS) diagnostic, which measures profiles of electron temperature (0.03
