Fusion-Product Transport in Axisymmetric Tokamaks: Losses and Thermalization
Hively, Lee Mizener
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https://hdl.handle.net/2142/67789
Description
Title
Fusion-Product Transport in Axisymmetric Tokamaks: Losses and Thermalization
Author(s)
Hively, Lee Mizener
Issue Date
1980
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
Energy
Language
eng
Abstract
High-energy fusion-product losses from an axisymmetric tokamak plasma are studied. Prompt-escape loss fluxes (i.e. prior to slowing down) are calculated including the non-separable dependence of flux as a function of poloidal angle and local angle-of-incidence at the first wall. The flux is strongly peaked at near grazing incidence, suggesting that blistering-injected impurities can reduce reactor burn times by 50-70%. Non-prompt losses (during slowing down, without anomalous effects) are also calculated to be 10-fold over in-situ deposition. While this result implies reduced alpha "ash" accumulation on axis, the reduced heating rate makes start-up and maintenance of ignition more difficult.
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