Multiple ray-tracing analysis for EBWH/CD experiments in QUEST

The power deposition profiles were analyzed with a multiple ray tracing code for the Electron Bernstein Wave Heating and Current Drive (EBWH/CD) experiments in the QUEST. In the EBWH/CD experiments in the QUEST, the O-X-B mode conversion scenario was selected for the plasma current sustainment in the rather low-density case. The algorithm for the wave penetration through evanescent layer beyond a O-mode cutoff position was developed for the multiple-ray analysis. The launching antenna positions were considered to obtain the significant wave absorption in the specific propagating direction using the developed ray-tracing code.