Microwave heating scenarios using a full wave code on SCR-1 Stellarator

The Stellarator of Costa Rica 1 (SCR-1) has been operational since June 2016. This small-size modular Stellarator functions with an aluminum torus shaped vacuum vessel 10 mm thick where R = 0.247 m, =0.040 m and R/a = 6.2, and containing a plasma volume of approximately 0.0078 m3. Twelve copper modular coils with 4.6 kA per turn produce a magnetic field strength at the toroidal vertical axis of approximately 43.8 mT. This field is EC resonant at R with 2.45 GHz in the second harmonic (Maximum power 5 kW). Currently, one objective in SCR-1 is to improve the ECR heating efficiency and to analyze the feasibility of incorporating electron Bernstein waves heating. Relatedly, this contribution analyzes microwave heating scenarios using the full wave code IPF-FDMC, which takes as input parameters the experimental electron density and temperature profile. This complete analysis takes into account the geometry of the vacuum vessel, the absorption and reflection in the walls, and considers different poloidal and toroidal scenarios. We present the electric field variations of the electromagnetic waves to find the optimum incident angle that is relevant for the conversion to electron Bernstein waves in O-X-B mode. Finally, we propose some strategic places in this Stellarator where an antenna could be located. For the future, it is planned to obtain a deposition profile of the microwave power to indicate the exact position of the UHR region, where the O-XB mode takes place.