Validation of Petra-m full-wave simulation code via RF Wave propagation experiments on LAPD*

A 3D full-wave code, Petra-m, was used to simulate wave propagation from a single strap RF antenna in the Large Plasma Device (LAPD). Petra-M simulations allow for importing 3D CAD models of the antenna used in the experiments as well as measured density profiles. The results of the simulations show good agreement with experiments done on the LAPD. The experiments were carried out in a magnetized helium plasma with plasma parameters $n_e$ $\approx$ $10^{18}$ – $10^{19}$ $m^{-3}$, $T_e$ ~ 1 – 10 eV and $B_0$ $\approx$ 0.1 to 0.18 T. A standing wave can be observed directly in front of the antenna in both the simulations and experimental results. Simulation results show fast-wave propagation in the dense core which is characteristic of a counterclockwise rotating m=1 like mode. This work will also present some preliminary results comparing the short wavelength, slow-wave propagation in the plasma edge, low-density region. With an improved solver and access to finer mesh elements, we should now be able to resolve the slow-wave edge dynamics. Validating the simulated edge interaction with experimental results plays an important role in helping us understand interactions between RF waves and the SOL region of fusion devices. $^1$S. Shiraiwa et al, EPJ Web Conf. 157, 03048 (2017)