Abstract
Recent JET measurements of heat load profiles during NBI-heated, natural density, ELMy H-modes revealed highly peaked profiles. In this study, ion orbit loss (IOL) from the core periphery was simulated numerically on four selected JET discharges (two high power H-modes, a fuelled H-mode and an L-mode), using realistic magnetic geometry and 2-D plasma/neutral background. The simulated and measured profiles agree quite well in all discharges, suggesting that IOL is indeed the mechanism responsible for the narrow profiles. The interaction between energetic ions and scrape-off layer (SOL) ions/atoms was also investigated, resulting in SOL power stopping factors of 60–80%. The momentum transfer via IOL to background ions was found to be in the same direction as the observed SOL flows (towards the inner target) but too small to be their primary cause. Preliminary simulation of IOL on ITER indicate peak heat loads <2 MW/m 2 at the outer target.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.