Abstract Details
Abstracts
Author: Yashika Ghai
Requested Type: Poster
Submitted: 2023-03-30 20:18:59
Co-authors: D. A. Spong, M. T. Beidler, D. del-Castillo-Negrete
Contact Info:
Oak Ridge National Laboratory
1 Bethel Valley Road
Oak Ridge, 37830
United States
Abstract Text:
Using the coupled KORC-AORSA model, we have numerically analyzed the complex nature of resonant interactions between whistler waves and runaway electrons in DIII-D. Resonant interactions of runaway electrons with whistler waves in a tokamak may lead to pitch angle scattering and energy dissipation of the runaways via synchrotron radiation. DIII-D experiments on whistler waves have indicated a possibility of intentionally launching whistler waves to mitigate the deleterious effects of REs on the plasma facing components via resonant interactions with whistlers [1,2]. In this framework, we follow full orbit RE trajectories using the KORC code in the presence of whistler wave fields as calculated by the AORSA code using the DIII-D whistler wave experimental data. We observed a change in the energy and pitch angle of the REs due to their interaction with Whistler waves. Our findings indicate a dependence of energy gain and change in RE pitch angle on the instantaneous energy, pitch angle, whistler field amplitude and the radial location of the REs. Our simulation model can further be used to get physical insights into tokamak experiments on whistler waves and REs.
[1] D. A. Spong et al., Phys. Rev. Lett., 120, 155002 (2018).
[2] W. W. Heidbrink at al., Plasma Phys. Control. Fusion, 61, 14007 (2019).
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-AC05-00OR22725, DE-FC02-04ER54698, DE-FG0289ER54297, DE-AC02-09CH11466.
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