Magnetic dust collected from multiple fusion devices (FTU, Alcator C-Mod, COMPASS) that feature different plasma-facing components (PFCs) and toroidal magnetic fields has been analyzed by means of the X-ray diffraction technique aiming to investigate the nature and origin of dust magnetism. Analysis led to the conclusion that the main mechanism of ferromagnetic dust formation is the change of iron crystalline phase from austenitic to ferritic during the re-solidification of stainless steel droplets. Analysis also revealed differences in the collected dust structure and an unexpectedly high amount of stainless steel based dust in its native austenitic phase. Theoretical estimates showed that the magnetic moment force can also mobilize strongly paramagnetic adhered dust prior to the establishment of proper tokamak discharges. The post-mortem analysis of dust collected during pure magnetic discharges in FTU confirmed these estimates.

从具有不同面向等离子体组件 (PFC) 和环形磁场的多个聚变装置（FTU、Alcator C-Mod、COMPASS）收集的磁性尘埃已通过旨在研究性质和起源的 X 射线衍射技术进行分析尘埃磁性。分析得出结论，铁磁粉尘形成的主要机制是在不锈钢液滴再凝固过程中铁晶相从奥氏体转变为铁素体。分析还揭示了收集的粉尘结构的差异，以及在其天然奥氏体相中意外大量的不锈钢基粉尘。理论估计表明，在建立适当的托卡马克放电之前，磁矩力还可以动员强顺磁性粘附的灰尘。