Quantitative Fitting of Transport Model Parameters to Experimental Profiles
E.O. Hadden, L. Jones, A. Ware, M. Gilmore and E. Schuster
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Providence, Rhode Island, USA, October 29 - November 2, 2012
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Abstract
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The results of a quantitative comparison of experimental data from the
HELCAT experiment and computational results from a 1D transport code
are presented. In this work, we present both recent work on understanding
the behavior of the transport model and a new effort to optimize of
transport code input parameters in order to fit experimental profiles.
This computational work is in collaboration with experi- mental work
on the impact of a set of biased concentric rings on turbulent transport
in the HELCAT device. The biased rings are modeled in the transport
code as local E×B momentum sources. In our characterization of the
transport code, both particle diffusivity and particle flux are shown
to decrease with increased ring bias voltages and both are relatively
insensitive to which of the rings is biased. On fitting to experimental
data, we are developing an optimization routine that selects a set of
input parameters to the transport code by minimizing a χ2 difference
between the code results and experimental data.
