Techniques of dimensional analysis have been applied to deuterium and hydrogen plasmas in DIII-D to test the postulate that the edge particle source plays a role in forming the edge H-mode density profile. These experiments show that the pedestal density scale length is typically a factor of two to three larger in hydrogen plasmas than in deuterium plasmas with dimensionally similar ion parameters. These results are in agreement with the postulate [1,2] that the density scale length is primarily determined by the local particle source, rather than by the shape of a hypothetical particle transport barrier. The electron temperature scale …
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Techniques of dimensional analysis have been applied to deuterium and hydrogen plasmas in DIII-D to test the postulate that the edge particle source plays a role in forming the edge H-mode density profile. These experiments show that the pedestal density scale length is typically a factor of two to three larger in hydrogen plasmas than in deuterium plasmas with dimensionally similar ion parameters. These results are in agreement with the postulate [1,2] that the density scale length is primarily determined by the local particle source, rather than by the shape of a hypothetical particle transport barrier. The electron temperature scale length displays a similar trend, albeit with a weaker density dependence. Thus the pedestal pressure gradient scale length is larger in hydrogen. It is also observed that the frequency of a coherent mode, localized within the pedestal, increases with the local density (i.e. inversely with the local density scale length) irrespective of the working gas species. This frequency is a factor of two lower in a hydrogen discharge than in a dimensionally similar deuterium plasma, a result which cannot be explained solely in terms of plasma physics variables.
29th European Physical Society Conference on Plasma Physics and Controlled Fusion, Montreux (CH), 06/17/2002--06/21/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 29TH EUROPEAN PHYSICAL SOCIETY CONFERENCE ON PLASMA PHYSICS AND CONTROLLED FUSION, JUNE 17-21, 2002, IN MONTREUX, SWITZERLAND, AND TO BE PUBLISHED IN THE ''PROCEEDINGS''
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Mahdavi, M. A.; Groebner, R. J.; Leonard, A. W.; Luce, T. C.; McKee, G. R.; Moyer, R. A. et al.Effect of Particle Sources on the Structure of theH-Mode Pedestal,
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