Determination of wall reflectivity for ECE frequencies in DIII-D
Determination of wall reflectivity for ECE frequencies in DIII-D
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发表时间：
1997-05
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通讯作者：
M. Austin;R. Ellis;T. Luce
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作者：
M. Austin;R. Ellis;T. Luce
下一代托卡马克回旋辐射损失的意义取决于第一壁材料的反射率。本文报道了石墨壁DIII-D托卡马克中电子回旋频率有效反射率的实验研究。利用绝对校准的迈克尔逊干涉仪测量了热等离子体放电的两个极化的光薄谐波（{omega} = n{omega}{sub ce}, n > 4）。通过将实测光谱与可调壁参数的ECE辐射输运代码的模拟相匹配，得到了反射率r和极化传递分数p。在150-400 GHz频率范围内，r = 0.76, p = 0.19的平均值。
The significance of cyclotron radiation losses in next-generation tokamaks depends on the reflectivity of first wall materials. An experimental study of the effective reflectivity for electron cyclotron frequencies in the graphite-walled DIII-D tokamak is reported. Measurements of optically-thin harmonics ({omega} = n{omega}{sub ce}, n > 4) are made for two polarizations from thermal plasma discharges using an absolutely calibrated Michelson interferometer. The reflectivity r and polarization transfer fraction p are obtained by matching measured spectra to simulations from an ECE radiation transport code with adjustable wall parameters. For the frequency range 150-400 GHz average values of r = 0.76 and p = 0.19 are found.