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Las Vegas, NV|Mandalay Bay Resort and Casino
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Fusion Science and Technology
Latest News
Proving DRACO will deliver
The United States is now closer than it has been in over five decades to launching the first nuclear thermal rocket into space, thanks to DRACO—the Demonstration Rocket for Agile Cislunar Orbit.
S. Murakami, H. Yamada, M. Sasao, M. Isobe, T. Ozaki, T. Saida, P. Goncharov, J. F. Lyon, M. Osakabe, T. Seki, Y. Takeiri, Y. Oka, K. Tumori, K. Ikeda, T. Mutoh, R. Kumazawa, K. Saito, Y. Torii, T. Watari, A. Wakasa, K. Y. Watanabe, H. Funaba, M. Yokoyama, H. Maassberg, C. D. Beidler, A. Fukuyama, K. Itoh, K. Ohkubo, O. Kaneko, A. Komori, O. Motojima, LHD Experimental Group
Fusion Science and Technology | Volume 46 | Number 2 | September 2004 | Pages 241-247
Technical Papers | Stellarators | doi.org/10.13182/FST04-A561
Articles are hosted by Taylor and Francis Online.
Confinement of energetic ions from neutral beam injection heating is investigated by changing the magnetic field configuration of the Large Helical Device from a classical heliotron configuration to an optimized neoclassical transport configuration to a level typical of "advanced stellarators." The experimental results show the highest count rate of fast neutral particles not in the optimized configuration but in the inward-shifted one. The GNET simulation results show a relatively good agreement with the experimental results, and they also show a lower energy loss rate in the optimized configuration. This contradiction can be explained by the radial profile of the energetic ions. The relatively good agreement between experimental and simulation results suggest that ripple transport (neoclassical) dominates the energetic ion confinement and that the optimization process is effective in improving confinement in helical systems.