Atomic Hydrogen Density Measurements in an Ion Source Plasma Using a Vacuum Ultraviolet Absorption Spectrometer PDF Download
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Languages : en
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A system to determine the density and temperature of ground state hydrogen atoms in a plasma by vacuum ultraviolet laser absorption spectroscopy is described. The continuous tunability of the spectrometer allows for analysis at any of the Lyman transitions. The narrow bandwidth of the laser system allows for the accurate determination of the absorption lineshape and hence the translational temperature. The utility of the system is exemplified by data obtained on an ion-source plasma. The measurements demonstrate the quality of the data as well as illustrating the behavior of this ion source under varying discharge conditions. 9 refs., 5 figs., 1 tab.
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Languages : en
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Book Description
A system to determine the density and temperature of ground state hydrogen atoms in a plasma by vacuum ultraviolet laser absorption spectroscopy is described. The continuous tunability of the spectrometer allows for analysis at any of the Lyman transitions. The narrow bandwidth of the laser system allows for the accurate determination of the absorption lineshape and hence the translational temperature. The utility of the system is exemplified by data obtained on an ion-source plasma. The measurements demonstrate the quality of the data as well as illustrating the behavior of this ion source under varying discharge conditions. 9 refs., 5 figs., 1 tab.
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Languages : en
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The role of highly vibrationally-excited hydrogen molecules has been postulated to be of great importance in H/sup /minus// ion sources. However the difficulty of making in-situ measurements has led to a paucity of direct determinations of these species within the plasma of these sources. Recently, vacuum-ultraviolet (VUV) laser absorption spectroscopy has been used to measure the H2 rovibrational populations up to v(prime)(prime) = 5 and J(prime)(prime) = 8 in a medium-power hydrogen plasma. This work extends those measurements to v(prime)(prime) = 8 and to J(prime)(prime) = 13. The populations of the vibrational levels still appear to be almost Boltzmann. The theoretically predicted plateau is not observed up to the detection limit. The dependence of several vibrational levels on discharge current and filling pressure is shown. 15 refs., 4 figs.
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Category : Power resources
Languages : en
Pages : 840
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Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 848
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Author: R. A. Rudd
Publisher:
ISBN:
Category : Gases, Rare
Languages : en
Pages : 40
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An extension of the theory of plasma temperature measurement by vacuum ultraviolet absorption has been made which makes this technique useful in obtaining time-resolved temperatures. A survey of available photoionization cross sections is given, and improvements which lead to better time resolution are suggested. (Author).
Author: Marthe Bacal
Publisher: Springer Nature
ISBN: 3031214765
Category : Science
Languages : en
Pages : 622
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Book Description
This book gives a comprehensive overview of hydrogen negative ion sources and their applications to particle acceleration and nuclear fusion. The book begins with fundamental aspects of negative ion production by volume and surface processes in hydrogen and its isotopes. It covers key topics, such as the need for separation of negative ion production and extraction regions, the need for lowering the work function of the plasma electrode by using caesium vapor or special materials for caesium-free sources, and the ion extractor structure required for hydrogen negative ion sources. Chapters covering various specific ion sources and applications are written by scientists who participated in their development and include sources for accelerators and for neutral beam injection into controlled nuclear fusion reactors.
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Category :
Languages : en
Pages : 280
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Book Description
Low pressure H2 discharges have been used for some time as sources of H− ions. These discharges contain many different species of particles which interact with each other and with the walls of the discharge chamber. Models exist that predict the populations of the various species for given macroscopic discharge parameters. However, many of the cross sections and wall catalyzation coefficients are unknown or somewhat uncertain. Therefore, it is of interest to measure the populations of as many of these species as possible, in order to determine the validity of the models. These models predict that H− is created predominantly by the two-step process of vibrational excitation of hydrogen molecules followed by dissociative attachment of slow electrons to these vibrationally-excited hydrogen molecules. Many different collisional processes must be included in the models to explain the dependence of the various populations upon macroscopic parameters. This work presents results of spectroscopic measurements of the density and translational temperature of hydrogen atoms and of specific rotationally- and vibrationally-excited states of electronic ground-state H2, in a discharge optimized for H− production, as well as conventional measurements of the various charged species within the plasma. The spectroscopic measurements are performed directly by narrowband, single-photon absorption in the vacuum ultraviolet.
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ISBN:
Category : Aeronautics
Languages : en
Pages : 308
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Author: United States. National Bureau of Standards
Publisher:
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Category : Government publications
Languages : en
Pages : 788
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Author:
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ISBN:
Category : Weights and measures
Languages : en
Pages : 790
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