Fast Ion Effects During Test Blanket Module Simulation Experiments in DIII-D
Authors: G.J. Kramer, R.V. Budny, R. Ellis, M. Gorelenkova, W.W. Heidbrink, T. Kurki-Suonio, R. Nazikian, A. Salmi, M.J. Schaffer, K. Shinohara, J.A. Snipes, D.A. Spong, T. Koskela, and M.A. Van Zeeland
Abstract: Fast beam-ion losses were studied in DIII-D in the presence of a scaled mockup
of two Test Blanket Modules (TBM) for ITER. Heating of the protective tiles
on the front of the TBM surface was found when neutral beams were injected and
the TBM fi elds were engaged. The fast-ion core confi nement was not signifi cantly
affected. Different orbit-following codes predict the formation of a hot spot on the
TBM surface arising from beam-ions deposited near the edge of the plasma. The
codes are in good agreement with each other on the total power deposited at the hot
spot predicting an increase in power with decreasing separation between the plasma
edge and the TBM surface. A thermal analysis of the heat
flow through the tiles shows that the simulated power can account for the measured tile temperature rise.
The thermal analysis, however, is very sensitive to the details of the localization of
the hot spot which is predicted to be di erent among the various codes.
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Submitted to: Nuclear Fusion (May 2011)
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Download PPPL-4630 (pdf 1.34MB 12 pp)
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