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Edge Fluctuation Measurements By Phase Contrast Imaging On Diii D
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Book Synopsis Edge Fluctuation Measurements by Phase Contrast Imaging on DIII-D. by :
Download or read book Edge Fluctuation Measurements by Phase Contrast Imaging on DIII-D. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel CO[sub 2] laser phase contrast imaging diagnostic has been developed for the DIII-D tokamak, where it is being employed to investigate density fluctuations at the outer edge of the plasma. This system generates 16-point, 1-D images of a 7.6 cm wide region in the radial direction, and is characterized by long wavelength (7.6 cm) and high frequency (100 MHz) capability, as well as excellent sensitivity ([rvec n] [approx-gt] 10[sup 9] cm[sup [minus]3]). The effects of vertical line integration have been studied in detail, both analytically and numerically with actual flux surface geometries generated by the EFITD magnetic equilibrium code. It is shown that in the present configuration the measurement is mostly sensitive to radial wave vectors. Experimental results on fluctuation suppression at the L- to H-mode transition and on the L-mode wave number spectrum are discussed briefly. Finally, future plans for extending the measurement to the core of the plasma and for investigating externally launched fast waves are presented.
Book Synopsis Edge Turbulence Measurements During the L- to H-mode Transition by Phase Contrast Imaging on DIII-D by : Miklos Porkolab
Download or read book Edge Turbulence Measurements During the L- to H-mode Transition by Phase Contrast Imaging on DIII-D written by Miklos Porkolab and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Edge Turbulence Measurements During the L- to H-mode Transition by Phase Contrast Imaging on DIII-D. by :
Download or read book Edge Turbulence Measurements During the L- to H-mode Transition by Phase Contrast Imaging on DIII-D. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A CO[sub 2]-laser imaging diagnostic measures the vertical line integrals of the density fluctuations at 16 radial locations within a 7.6-cm-wide region at the outer edge of the DIII-D tokamak. The phase-contrast technique provides a flat response to wave numbers in the range 1--16 cm[sup[minus]1] and is mostly sensitive to radial wave vectors. This last property ensures that fluctuations are detected essentially in the plasma frame, since the E x B drift associated with the radial electric field is mainly in the poloidal direction. The radial resolution is 0.5 cm, the data acquisition bandwidth is 1 MHz, and the density sensitivity is on the order of 10[sup 9] cm[sup[minus]3]. The DIII-D Phase Contrast Imaging (PCI) diagnostic has been employed in the study of plasma turbulence, particularly at the transition from L- to H-mode. Past work has shown that the average amplitude of the line-integrated fluctuations in the plasma is reduced at the onset of the H-mode, in agreement with measurements by other diagnostics in DIII-D and elsewhere. In this paper the authors report on measurements of turbulence carried out during a study of low-power L- to H-mode transitions. As the input power approaches the threshold for H-mode, the transition occurs on a progressively slower time scale. The new results are consistent with past observations in L-mode and in the fully developed H-mode; novel features emerge, however, in the transient phase immediately following the transition. The phenomenology of these events, which lack a theoretical explanation at present, will be discussed in the next section.
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 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Fusion Science and Technology written by and published by . This book was released on 2008 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Edge Fluctuation Measurements from Phase Contrast Imaging, Beam Emission Spectroscopy, Langmuir Probes and Reflectometry on DIII-D Tokamak Plasma by : Jon Christian Rost
Download or read book Comparison of Edge Fluctuation Measurements from Phase Contrast Imaging, Beam Emission Spectroscopy, Langmuir Probes and Reflectometry on DIII-D Tokamak Plasma written by Jon Christian Rost and published by . This book was released on 2000 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis An Assessment of the Department of Energy's Office of Fusion Energy Sciences Program by : National Research Council
Download or read book An Assessment of the Department of Energy's Office of Fusion Energy Sciences Program written by National Research Council and published by National Academies Press. This book was released on 2001-05-07 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this assessment of the fusion energy sciences program of the Department of Energy's (DOE's) Office of Science is to evaluate the quality of the research program and to provide guidance for the future program strategy aimed at strengthening the research component of the program. The committee focused its review of the fusion program on magnetic confinement, or magnetic fusion energy (MFE), and touched only briefly on inertial fusion energy (IFE), because MFE-relevant research accounts for roughly 95 percent of the funding in the Office of Science's fusion program. Unless otherwise noted, all references to fusion in this report should be assumed to refer to magnetic fusion. Fusion research carried out in the United States under the sponsorship of the Office of Fusion Energy Sciences (OFES) has made remarkable strides over the years and recently passed several important milestones. For example, weakly burning plasmas with temperatures greatly exceeding those on the surface of the Sun have been created and diagnosed. Significant progress has been made in understanding and controlling instabilities and turbulence in plasma fusion experiments, thereby facilitating improved plasma confinement-remotely controlling turbulence in a 100-million-degree medium is a premier scientific achievement by any measure. Theory and modeling are now able to provide useful insights into instabilities and to guide experiments. Experiments and associated diagnostics are now able to extract enough information about the processes occurring in high-temperature plasmas to guide further developments in theory and modeling. Many of the major experimental and theoretical tools that have been developed are now converging to produce a qualitative change in the program's approach to scientific discovery. The U.S. program has traditionally been an important source of innovation and discovery for the international fusion energy effort. The goal of understanding at a fundamental level the physical processes governing observed plasma behavior has been a distinguishing feature of the program.
Download or read book Physics Letters written by and published by . This book was released on 2000 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: General physics, atomic physics, molecular physics, and solid state physics.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Measurement of Velocity Turbulence and Application to Zonal Flow Detection in Tokamak Plasmas by : Marcin Jakubowski
Download or read book Measurement of Velocity Turbulence and Application to Zonal Flow Detection in Tokamak Plasmas written by Marcin Jakubowski and published by . This book was released on 2003 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Winter Waterfront : Year-round Use in Metropolitan Toronto by : Xenia Klinger
Download or read book Winter Waterfront : Year-round Use in Metropolitan Toronto written by Xenia Klinger and published by . This book was released on 1991 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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