Measurement of density fluctuations in the TEXT-U tokamak with a phase contrast imaging diagnostic PDF Download
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Author: Romik Chatterjee
Publisher:
ISBN:
Category : Diagnostic imaging
Languages : en
Pages : 232
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Book Description
Author: Romik Chatterjee
Publisher:
ISBN:
Category : Diagnostic imaging
Languages : en
Pages : 232
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 782
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Author: Alexander Mazurenko
Publisher:
ISBN:
Category :
Languages : en
Pages : 320
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Book Description
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.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Author: James Robert Dorris (III.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Book Description
The DIII-D phase contrast imaging (PCI) diagnostic has been upgraded and used to measure turbulence in the outer plasma region (0.7
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 652
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Author: Jian Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Density fluctuations with ballooning characteristics have been found in the core region (0.1
Author: International Atomic Energy Agency
Publisher: Fusion Energy 1996
ISBN:
Category : Business & Economics
Languages : en
Pages : 956
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Book Description
Proceedings of the Sixteenth International Conference, formerly called the International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Montreal, 7-11 October 1996. The papers presented reflect the excellent progress achieved since the last conference in Seville 1994. Among many other achievements, the Tokamak Fusion Test Reactor has produced over 10 MW of fusion power, the JT-60U experiment has demonstrated plasma conditions equivalent to breakeven, the reversed shear mode has been demonstrated, low aspect ratio tokamaks have produced promising results and plans have been drawn up for powerful new inertial confinement fusion experiments.
Author:
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ISBN:
Category :
Languages : en
Pages : 173
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Book Description
This report contains the following eleven papers presented at the conference: Neutral Beam Diagnostics for Alcator C-Mod; A Study for the Installation of the TEXT HIBP on DIII-D; Time-domain Triple-probe Measurement of Edge Plasma Turbulence on TEXT-U; A Langmuir/Mach Probe Array for Edge Plasma Turbulence and Flow; Determination of Field Line Location and Safety Factor in TEXT-U; Hybrid ECE Imaging Array System for TEXT-U; First Results from the Phase Contrast Imaging System on TEXT-U; A Fast Tokamak Plasma Flux and Electron Density Reconstruction Technique; Time-series Analysis of Nonstationary Plasma Fluctuations Using Wavelet Transforms; Quantitative Modeling of 3-D Camera Views for Tokamak Divertors; and Variable-frequency Complex Demodulation Technique for Extracting Amplitude and Phase Information. Selected papers are indexed separately for inclusion in the Energy Science and Technology Database.
