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Characterizing The Role Of Drift Wave Turbulence In A Reversed Field Pinch
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Book Synopsis Characterizing the Role of Drift-wave Turbulence in a Reversed Field Pinch by : Takashi Nishizawa
Download or read book Characterizing the Role of Drift-wave Turbulence in a Reversed Field Pinch written by Takashi Nishizawa and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trapped-electron-mode (TEM) microturbulence appears in the edge of MST RFP plas- mas that have reduced tearing instability and tokamak-level confinement using current profile control. High-frequency density fluctuations (k[modifier letter up tack][small rho]s = 0.2 − 0.4) emerge with a critical gradient threshold as the density profile steepens. These features are consistent with gyrokinetic simulations using GENE that include a small magnetic fluctuation mimicking residual tearing activity, which tends to disrupt zonal flow formation. Here we present direct measurements of impurity transport and zonal flows to investigate TEM turbulence saturation and transport. A new method of linearized spectrum cor- relation analysis for spectroscopic data resolves simultaneously the fluctuations in both the turbulent radial velocity (vr ∼ 1km/s) and impurity density. Their correlation reveals an inward flux of C2+ impurities, which is the first direct evidence for trans- port associated with TEM turbulence in the RFP. The C2+ ions are edge localized and evolve from graphite limiters. The profile of the plasma potential is measured in the edge using two multi-channel capacitive probes, each having 7 mm radial spatial reso- lution. An edge-localized flow is observed, and with the probes separated 180 degrees toroidally, the flow has a long-range correlation characteristic of zonal structure. The amplitude of the flow is modulated by the turbulence, as occurs in predator-prey-like dynamics. These measurements, together with the gyrokinetic modeling, suggest that transport in RFP plasmas will ultimately be regulated by microturbulence as occurs in tokamak and stellarator plasmas.
Book Synopsis Experimental Characterization of Drift-wave Turbulence in the Sheared, Cylindrical Slab by : Kevin Michael Lee
Download or read book Experimental Characterization of Drift-wave Turbulence in the Sheared, Cylindrical Slab written by Kevin Michael Lee and published by . This book was released on 2009 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma turbulence on a uniform density gradient with unfavorable magnetic curvature is investigated extensively in the Helimak device. The turbulence is strong with density and electrostatic potential fluctuation levels in excess of 40%. Measurements of the dispersion relation, k[subscript z], and k[subscript parallel lines] identify the the fluctuations with drift-waves, which propagate in the poloidal direction at the diamagnetic drift velocity and have a small, but nite parallel wavenumber. A non-zero phase shift between the density and potential fluctuations gives rise to turbulent cross-eld particle transport, which is measured using spectral techniques. In addition, the electrostatic drift-wave fluctuations have a small magnetic component that is driven by the turbulent parallel current [scientific symbols]. An examination of nonlinear processes associated with the plasma turbulence uncovers high levels of intermittency near the plasma edge and long-time persistence of the density fluctuations on the order of the parallel confinement time. An analysis of the bispectrum conrms the existence local and nonlocal three-wave interactions between unstable drift-waves although the turbulent saturation of the density fluctuation spectrum is likely due nonlinear processes acting in the time domain.
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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis The Development of Collisional-Drift-Wave Turbulence by : Hans William Hendel
Download or read book The Development of Collisional-Drift-Wave Turbulence written by Hans William Hendel and published by . This book was released on 1969 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Documentation of Plasma Physics. Pt. 1, Experimental Plasma Physics [and] Theoretical Plasma Physics by :
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Download or read book Government Reports Annual Index written by and published by . This book was released on 1989 with total page 1372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Chaos and Simple Determinism in Reversed Field Pinch Plasmas by : Christopher A. Watts
Download or read book Chaos and Simple Determinism in Reversed Field Pinch Plasmas written by Christopher A. Watts and published by . This book was released on 1993 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Government Reports Announcements & Index by :
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Download or read book American Doctoral Dissertations written by and published by . This book was released on 1993 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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