Simulation of neutron emission in neutral beam injection heated plasmas with the real-time code RABBIT

JET Contributors, ASDEX Upgrade DIII-D Eurofusion MS, D. R. Hatch, T. Ahlgren, L. Aho-Mantila, M. Airila, C. Björkas, K. Heinola, A. Lahtinen, K. Nordlund, E. Safi, S.-P. Pehkonen, A. Salmi, T. Tala, J. Likonen, S. Koivuranta, A. Hakola, O. Asunta, M. Groth, J. KarhunenT. Kurki-Suonio, B. Lomanowski, J. Lonnroth, M. I. K. Santala, S. K. Sipila, J. Varje, M. Weiland, A. Jarvinen

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In plasmas heated with deuterium beams a deficit of the expected fusion neutron rate is an indicator of the deterioration of the fast-ion confinement, caused, for instance, by magnetohydrodynamic instabilities. The capability of predicting this deficit during the discharge relies on the availability of real-time estimates of the neutron rate from NBI codes which must be fast and accurate at the same time. Therefore, the recently developed real-time RABBIT code for neutral beam injection (NBI) simulations has been extended to output the distribution function and calculate the neutron emission. After the description of this newly installed diagnostics in RABBIT, benchmarks with NUBEAM, a massively used and validated Monte Carlo NBI solver, are discussed on ASDEX-Upgrade and JET cases. A first application for control-room intershot analysis on DIII-D is presented, and the results are compared on a large database with a slower NUBEAM analysis. Further application possibilities, e.g. for real-time control of Alfven eigenmodes, are outlined.

Original languageEnglish
Article number086002
JournalNuclear Fusion
Issue number8
Number of pages11
Publication statusPublished - Aug 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences

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