Double tearing modes (DTMs), induced by double current sheet configurations or two neighboring rational surfaces with the same safety factor in tokamaks, are widely observed in solar, space, and fusion plasmas. In this paper, the evolution of DTMs without a guide field is investigated numerically using a hybrid model (electron fluid+ion PIC). The overall evolution processes of DTMs are qualitatively consistent with previous works using other models. The particle dynamics during the evolution of DTMs is analyzed in detail. Behaviors of ions and electrons present different characteristics around the reconnection region which gives rise to Hall effects producing the out-of-plane quadrupole magnetic field. In the explosive reconnection process with interactions between two DTMs islands, the asymmetric drive and the thin current layer feature lead to the emergence of secondary magnetic islands which develop with the late evolution of the DTMs.

在托卡马克中，由双电流片结构或两个具有相同安全系数的相邻理性表面引起的双撕裂模式（DTM）在太阳，空间和聚变等离子体中得到了广泛观察。在本文中，使用混合模型（电子流体+离子PIC），对没有导向场的DTM的发展进行了数值研究。DTM的整体演变过程在质量上与以前使用其他模型的工作一致。详细分析了DTM演变过程中的粒子动力学。离子和电子的行为在重新连接区域周围呈现出不同的特性，这会产生霍尔效应，从而产生平面外四极磁场。在爆炸性的重新连接过程中，两个DTM岛之间相互作用，