Simulation of experimentally achieved detached plasmas using the UEDGE code Page: 18 of 32
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We have shown detailed comparisons between simulation and experiment for a
particular DIII-D discharge. While we have accurately reproduced many of the
experimental results, we find an important discrepancy in the simulation of Ha
emission from neutrals which recycle at the divertor plate. One interpretation of this
discrepancy is that the low temperature region which is associated with the
detached plasma state is larger in the experiment than predicted by the model. This,
in turn, suggests that our models do not adequately reflect the physics of this low
temperature region. The new experimental results indicate the temperature in the
region is in the range of 1 to 2 eV rather than 5 to 10 eV indicated in earlier results. It
has been suggested by Post12 that there are many important atomic physics
processes exist when the electron temperature is this low. These processes are not in
the current models. It is hoped that the computer models described in this report
will accurately reproduce both the attached and detached plasma states when these
processes are introduced.
Acknowledgment
We happily acknowledge many valuable discussions with R.D. Stambaugh and
A. Mahdavi about the work described in this report. This work was supported under
U.S. DOE auspices by Lawrence Livermore National Laboratory, contract
No.W-7405-ENG-48, and General Atomics, contract No. DE-AC03-89ER51114.
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Porter, G. D.; Allen, S. & Fenstermacher, M. Simulation of experimentally achieved detached plasmas using the UEDGE code, article, October 30, 1995; California. (https://digital.library.unt.edu/ark:/67531/metadc667586/m1/18/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.