Abstract A tomographic reconstruction method is developed for the visible light imaging diagnostic system of Experimental Advanced Superconducting Tokamak (EAST) to provide the emissive profile on the poloidal cross section of the divertor region. Weight matrix is calculated by a ray tracing method according to the optical path of the visible light imaging diagnostic system in the delicate three-dimensional grid model of EAST first wall to avoid the influence of complex structures of the divertor region. The Philips-Tikhonov regularization algorithm with second-order correction is adopted to calculate the emissive profile. The phantom tests are performed and the effectiveness of the method is confirmed with signal to noise ratio (SNR) at 50. The method is applied to the experimental images detected by the visible light imaging diagnostic and clear peaks are identified in the reconstructed emission profiles, which is in consistent with the radiation belts observed in the experimental images.

中文翻译：

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偏滤器区域发射剖面的断层扫描重建，用于实验先进超导托卡马克的可见光成像诊断

摘要 针对实验先进超导托卡马克（EAST）的可见光成像诊断系统开发了一种断层扫描重建方法，以提供偏滤器区域极向横截面的发射剖面。在EAST第一壁精细的三维网格模型中，根据可见光成像诊断系统的光路，通过光线追踪方法计算权重矩阵，避免偏滤器区域复杂结构的影响。采用具有二阶校正的 Philips-Tikhonov 正则化算法来计算发射分布。执行了体模测试，并通过信噪比 (SNR) 为 50 来确认该方法的有效性。