As the commission of a visible spectroscopic diagnostic to the HL-2A tokamak for the measurements of both bremsstrahlung continuum radiation and impurity line emission, a Bayesian tomography method has been developed to this diagnostic for the reconstruction of a 2D emission distribution from line-integrated data. In this method, Gaussian process prior is adopted as an effective way to regularize the smoothness of the emission field, which can be truncated to enforce non-negative constraint of the emission values. For the reliability and quality assessment, uncertainty of the reconstruction can be examined through its confidence interval derived from a posterior probability. Performance of this Gaussian process tomography method is exemplified by the reconstructions of the bremsstrahlung continuum emission, which coincide with the equilibrium magnetic flux surfaces with respect to position and shape. In another case the reconstruction of CVI line emission in the visible range (n = 8→7, 529.05 nm) disclose the existence of a bright radiation belt due to the plasma–wall interaction.

作为对HL-2A托卡马克进行可见光谱诊断以测量致连续辐射和杂质线发射的一种方法，贝叶斯层析成像方法已被开发用于这种诊断，可从线积分数据重建二维发射分布。在这种方法中，采用高斯过程先验作为规范发射场平滑度的有效方法，可以将其截断以强制执行发射值的非负约束。为了进行可靠性和质量评估，可以通过后验概率得出的置信区间检查重建的不确定性。这种高斯过程层析成像方法的性能以the致辐射连续谱发射的重建为例，在位置和形状方面与平衡磁通表面一致。在另一种情况下，在可见光范围内重建CVI线发射（n = 8→7，529.05 nm）揭示了由于等离子体-壁相互作用而存在的明亮辐射带。