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

机译:在SCR-1 Stellarator上使用全波代码的微波加热方案

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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.
机译:哥斯达黎加1号(Stellarator)的Stellarator(SCR-1)于2016年6月投入运行。这款小型模块化Stellarator配有10毫米厚的铝制圆环形状的真空容器,其中R = 0.247 m = 0.040 m和R / a = 6.2,且血浆体积约为0.0078立方米。每匝4.6 kA的十二个模块化铜线圈在环形垂直轴上产生的磁场强度约为43.8 mT。该磁场在R处以2.45 GHz的二次谐波(最大功率5 kW)发生EC谐振。目前,SCR-1的一个目标是提高ECR加热效率并分析合并电子伯恩斯坦波加热的可行性。相关地,此贡献使用全波代码IPF-FDMC分析了微波加热的情况,该代码以实验电子密度和温度曲线作为输入参数。完整的分析考虑了真空容器的几何形状,壁中的吸收和反射,并考虑了不同的多极和环形情况。我们介绍电磁波的电场变化,以找到与以O-X-B模式转换为电子伯恩斯坦波有关的最佳入射角。最后,我们在此Stellarator中提出了一些战略性位置,可以在其中放置天线。对于将来,计划获得微波功率的沉积曲线,以指示发生O-XB模式的UHR区域的确切位置。

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