April 4-6

Abstract Details

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Author: Yashika Ghai
Requested Type: Poster
Submitted: 2022-03-03 16:31:59

Co-authors: D. A. Spong, J. Varela, L. Garcia, W. Heidbrink

Contact Info:
Oak Ridge National laboratory
1 Bethel Valley Road
Oak Ridge, Tennessee   37830
United States of Ame

Abstract Text:
Understanding energetic particle (EP) physics in ITER-like scenarios is significant to predict the energetic particle confinement and losses in future fusion reactors. Significant alpha-particle losses in ITER due to interaction with multiple unstable Alfvén eigenmodes might affect the plasma self-heating and may also lead to extensive wall-loading. Computer simulations based on reduced models can be useful to investigate EP confinement and transport properties of ITER operational scenarios. These simulations will be first verified and validated through DIII-D experiments designed to simulate the ITER scenarios. Two existing DIII-D shots having safety factor and EP instabilities like ITER have been selected as part of the U.S. 2022 Theory Milestone project. We aim to use gyro-fluid code FAR3d to do a validation exercise for ITER steady state case using existing DIII-D shot (#132710). The safety factor profile in this DIII-D shot fits well to the expected ITER steady state q-profile but with a weak reverse shear in the plasma core as compared to a stronger reversed shear in ITER. FAR3d uses coupled reduced MHD equations for the thermal plasma and gyro-fluid equations for the energetic particles to determine the unstable Alfvén eigenmodes and can also be applied in the nonlinear regimes to study the coupling of various AEs and the associated fast ion transport over long timescales. This validation exercise can be further used to suggest DIII-D experiments for reactor relevant scenarios with better profile matching and parameter scans in 2022.

This material is based upon work supported by the U.S. Department of Energy, Office of
Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE
Office of Science user facility, under Award(s) DE-SC0020298, DE-AC05-00OR22725, DEFC02-04ER54698, DE-FG0289ER54297, DE-AC02-09CH11466 and the U.S. DOE SciDAC
ISEP Center (DE-SC0018108).