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A multi-ray tracing code LHDGauss has been developed to analyze and predict the electron cyclotron resonance (ECRH) deposition profile in the LHD. The original LHDGauss had been developed so that the injected ECRH elliptical Gaussian beam is modeled by multi-ray for O or X mode, and the ray behavior and power deposition profile are calculated for a given density and temperature profile on a given fixed flux surface structure. As the LHD experiment progressed toward higher density, higher injection power, mode conversion/mixing caused by the peripheral density and strong magnetic shear became important. LHDGauss is upgraded to implement this mode conversion/mixing effect precisely. Another upgrade is automating the execution of LHDGauss using plasma parameters and configurations provided by AutoAna system to meet the large and frequent demand of ECRH power deposition profile for the confinement and transport analysis.
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Kubo et al. (2026) studied this question.
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