M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations

Canal, G. P.; Ferraro, N. M. ; Evans, T. E.; Osborne, T. H.; Menard, J. E. ; Ahn, J. -W.; Maingi, R. ; Wingen, A.; Ciro, D.; Frerichs, H.; Schmitz, O.; Soukhanovskii, V.; Waters, I.; Sabbagh, S. A.
Issue date: 2017
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Canal, G. P., Ferraro, N. M., Evans, T. E., Osborne, T. H., Menard, J. E., Ahn, J. -W., Maingi, R., Wingen, A., Ciro, D., Frerichs, H., Schmitz, O., Soukhanovskii, V., Waters, I., & Sabbagh, S. A. (2017). M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.11578/1367873
  author      = {Canal, G.  P. and
                Ferraro, N. M. and
                Evans, T. E. and
                Osborne, T. H. and
                Menard, J. E. and
                Ahn, J. -W. and
                Maingi, R. and
                Wingen, A. and
                Ciro, D. and
                Frerichs, H. and
                Schmitz, O. and
                Soukhanovskii, V. and
                Waters, I. and
                Sabbagh, S. A.},
  title       = {{M3D-C1 simulations of the plasma respons
                e to RMPs in NSTX-U single-null and snow
                flake divertor configurations}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2017,
  url         = {https://doi.org/10.11578/1367873}

Non-axisymmetric control coils and the so-called snowflake divertor configuration are two potential solutions proposed to solve two separate outstanding issues on the path towards self-sustained burning plasma operations, namely the transient energy bursts caused by edge localized modes and the steady state heat exhaust problem. In a reactor, these two proposed solutions would have to operate simultaneously and it is, therefore, important to investigate their compatibility and to identify possible conflicts that could prevent them from operating simultaneously. In this work, single- and two-fluid resistive magnetohydrodynamic calculations are used to investigate the effect of externally applied magnetic perturbations on the snowflake divertor configuration. The calculations are based on simulated NSTX-U plasmas and the results show that additional and longer magnetic lobes are created in the null-point region of the snowflake configuration, compared to those in the conventional single-null. The intersection of these longer and additional lobes with the divertor plates are expected to cause more striations in the particle and heat flux target profiles. In addition, the results indicate that the size of the magnetic lobes, in both single-null and snowflake configurations, are more sensitive to resonant magnetic perturbations than to non-resonant magnetic perturbations. The results also suggest that lower values of current in non-axisymmetric control coils would be required to suppress edge localized modes in plasmas with the snowflake configuration.

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1 readme.txt 1.79 KB
2 ARK_DATA.zip 8.68 MB