Diagnostics of Tokamak Fusion Plasma Via Correlation Analysis of Soft X-ray Signals PDF Download
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Author: I. Pazsit
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ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages :
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Author: I. Pazsit
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages :
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Author: R. D. Gill
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Category :
Languages : en
Pages : 9
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Author: J. Karlsson
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Category : Plasma (Ionized gases)
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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X-ray diagnostic measurements have been used in a number of experiments to improve our understanding of important tokamak physics issues. The impurity content in TFTR plasmas, its sources and control have been clarified through soft x-ray pulse-height analysis (PHA) measurements. The dependence of intrinsic impurity concentrations and Z/sub eff/ on electron density, plasma current, limiter material and conditioning, and neutral-beam power have shown that the limiter is an important source of metal impurities. Neoclassical-like impurity peaking following hydrogen pellet injection into Alcator C and a strong effect of impurities on sawtooth behavior were demonstrated by x-ray imaging (XIS) measurements. Rapid inward motion of impurities and continuation of m = 1 activity following an internal disruption were demonstrated with XIS measurements on PLT using injected aluminum to enhance the signals. Ion temperatures up to 12 keV and a toroidal plasma rotation velocity up to 6 x 105 m/s have been measured by an x-ray crystal spectrometer (XCS) with up to 13 MW of 85-keV neutral-beam injection in TFTR. Precise wavelengths and relative intensities of x-ray lines in several helium-like ions and neon-like ions of silver have been measured in TFTR and PLT by the XCS. The data help to identify the important excitation processes predicted in atomic physics. Wavelengths of n = 3 to 2 silver lines of interest for x-ray lasers were measured, and precise instrument calibration techniques were developed. Electron thermal conductivity and sawtooth dynamics have been studied through XIS measurements on TFTR of heat-pulse propagation and compound sawteeth. A non-Maxwellian electron distribution function has been measured, and evidence of the Parail-Pogutse instability identified by hard x-ray PHA measurements on PLT during lower-hybrid current-drive experiments.
Author: R. D. Gill
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ISBN:
Category :
Languages : en
Pages : 5
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Author: S. Von Goeler
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Category : Grenz rays
Languages : en
Pages : 18
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Author: E. Källne
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Category :
Languages : en
Pages : 16
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 782
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Author: United States. Division of Magnetic Fusion Energy
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Category : Tokamaks
Languages : en
Pages : 156
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Author:
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ISBN:
Category :
Languages : en
Pages : 78
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