This paper presents the design, simulation and characterization of a high temperature black body source for a target temperature of 873 K and frequency range of 70 to 143 GHz. The high temperature black body source has been designed using CST Microwave Studio. Different solvers in CST have been used to determine various black body parameters such as scattering, emissivity, reflectivity, radiation intensity, temperature distribution etc. This work consists of two novel approaches. First, the emissivity values have been calculated from the simulation results. Second, the design and optimization of the emitter and heater surface has been carried out separately and finally integrated to form the black body source. After sufficient study & literature survey, silicon carbide was selected as a suitable material for emitter and molybdenum for heater. The design comprises of a pyramidal moth eye structure made up of silicon carbide. Design and simulations were carried out with different dimensions of pyramids by varying their slant angle and height. The thickness of the silicon carbide base plate has also been varied to achieve optimal performance. Selection of best design is done by comparing results of radiation intensity, emissivity and temperature gradient of various simulated models. The design aimed to obtain the emissivity values near to unity with uniform temperature distribution across the emitter surface. Significant improvement in emissivity values were obtained by multiple changes in the heater and emitter design. The designed source after fabrication will be used as a high temperature calibration source for Michelson interferometer system serving as an electron cyclotron emission (ECE) diagnostic at IPR.

中文翻译：

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用于校准迈克尔逊干涉仪 ECE 诊断的高温黑体源的设计与仿真

本文介绍了目标温度为 873 K、频率范围为 70 至 143 GHz 的高温黑体源的设计、仿真和表征。高温黑体源是使用 CST Microwave Studio 设计的。CST 中的不同求解器已用于确定各种黑体参数，例如散射、发射率、反射率、辐射强度、温度分布等。这项工作由两种新颖的方法组成。首先，根据模拟结果计算发射率值。其次，发射器和加热器表面的设计和优化是分开进行的，最终集成形成黑体源。经过充分的研究和文献调查，选择碳化硅作为发射极的合适材料，选择钼作为加热器的合适材料。该设计包括由碳化硅制成的金字塔形蛾眼结构。通过改变倾斜角度和高度，对不同尺寸的金字塔进行了设计和模拟。碳化硅基板的厚度也发生了变化，以实现最佳性能。通过比较各种模拟模型的辐射强度、发射率和温度梯度的结果来选择最佳设计。该设计旨在获得接近一致的发射率值以及整个发射器表面的均匀温度分布。通过加热器和发射器设计的多次改变，发射率值得到显着改善。制造后设计的光源将用作迈克尔逊干涉仪系统的高温校准源，作为 IPR 的电子回旋发射 (ECE) 诊断。