A phenomenon is analyzed, which is observed at some laboratory-scale tokamaks and seems to be unexplained: a strong drop in the soft x-ray radiation (SXR) after it passed through the ‘thick’ Be foils (the pit in the SXR spectrum). This phenomenon becomes more pronounced as the foil thickness increases and the plasma electron density decreases. The explanation for this phenomenon is proposed, which involves the assumption that the Maxwellian electron velocity distribution becomes ‘depleted’ in the range of velocities that are 3–5 times higher than the thermal one. The anomalous electron heat transport along the weakly perturbed toroidal magnetic field of the tokamak (the ‘magnetic flutter’ model) seems to be the most probable reason for this depletion. Thus, the ‘SXR—Pit’ can be a new tool for studying the physical nature of the anomalous electron transport in tokamaks.

分析了一种现象，该现象在某些实验室规模的托卡马克中观察到，并且似乎无法解释：通过“厚” Be箔片（SXR光谱中的凹坑）后，软X射线辐射（SXR）急剧下降。 ）。随着箔厚度增加和等离子体电子密度降低，该现象变得更加明显。提出了对此现象的解释，其中包括一个假设，即麦克斯韦电子速度分布在速度范围内比“热”速度高3至5倍时“耗尽”。沿着托卡马克的弱摄动环形磁场（“电磁颤动”模型）的异常电子传热似乎是造成这种损耗的最可能原因。因此，