The Effects of Coulombic Large Energy Transfer Collisions in Fusion Grade Plasmas (Kinetic, Diagnostic, Distortion)
Stroud, Phillip David
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https://hdl.handle.net/2142/70900
Description
Title
The Effects of Coulombic Large Energy Transfer Collisions in Fusion Grade Plasmas (Kinetic, Diagnostic, Distortion)
Author(s)
Stroud, Phillip David
Issue Date
1984
Department of Study
Nuclear Engineering
Discipline
Nuclear Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Nuclear
Abstract
The mechanism of Coulombic large energy transfer (CLET) collisions is investigated for applications to fusion power systems. This mechanism generates a distortion in the distribution function of the thermal ions due to CLET collisions between the fast ions and thermal ions. An analytic expression is obtained for the CLET differential scattering kernel. A formalism is developed in which this kernel is used to calculate the distribution function evolution when CLET collisions are treated correctly. This formalism accounts for the thermal motion of the ions. For the first time, those Coulombic collisions which transfer an energy between several percent and several times the temperature are explicitly treated. The effects of the CLET mechanism are calculated for a variety of experimental and reactor size fusion machines.
The effect of the CLET collisions on the thermal ions can best be described as a broadening in energy of the thermal ion distribution function. The ramifications of this broadening have been examined for three areas of plasma engineering. First, the distortion can significantly enhance the fusion reactivity of the thermal ions. This can be important to the power flow analysis, especially during the start-up heating phase. Second, the distortion must be considered when interpreting the results of two common ion temperature diagnostic techniques. Finally, the possibility is considered of utilizing the CLET distortion to preferentially remove impurity ions.
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