|approved||sherwood2018posterv5.pdf||2018-05-02 10:21:04||Thomas Jenkins|
Author: Thomas G. Jenkins
Requested Type: Poster
Submitted: 2018-02-28 17:08:28
Co-authors: D. N. Smithe
5621 Arapahoe Avenue, Suite A
Boulder, Colorado 80303
The development of robust radiofrequency (RF) actuators for plasma heating and current drive will be critical in sustaining steady-state operation of future magnetic fusion devices. As part of this development, an increased understanding of how applied RF power interacts with the scrape-off layer (SOL) plasma, as well as with plasma sheaths formed near material surfaces such as antenna hardware, is sought. We summarize a number of ongoing efforts to numerically model these interactions using Vorpal, a high-performance particle-in-cell/finite-difference time-domain code; eventual couplings of Vorpal with materials, turbulence, and transport codes are anticipated as part of ongoing work by the RF-SciDAC group. Present efforts include (a) particle-in-cell (PIC) modeling of sheath rectification in time-varying RF sheaths on antenna surfaces, and the benchmarking of these results against other RF-SciDAC codes; (b) comparison of experimentally measured electric fields in the RF sheath with Vorpal models; (c) computation of ponderomotive force terms near the antenna hardware, which arise as RF power passes through the SOL; and (d) modeling of RF scattering from SOL turbulence. Ongoing progress in these areas will be discussed.
Supported by the SciDAC Center for Integrated Simulation of Fusion-Relevant RF Actuators (DE-SC0018319).